Neutrophil-driven and interleukin-36γ-associated ocular surface inflammation in chronic Stevens-Johnson syndrome.

PURPOSE: This study aims to elucidate the tear proteome and understand the underlying molecular mechanisms involved in the ocular complications following Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN). METHODS: Mass spectrometry (MS) was performed to quantify the tear fluid proteins from chronic SJS/TEN patients (n = 22 eyes) and age- and gender-matched controls (n = 22 eyes). The candidate proteins were validated using ELISA (n = 80 eyes) in tear samples and immunohistochemistry (IHC; n = 12) in eyelid margin specimens. These proteins were compared for significant differences based on age, gender, disease duration, and ocular severity. RESULTS: A total of 1692 tear fluid proteins were identified, of which 470 were significantly differentially regulated in chronic SJS/TEN. The top 10 significantly upregulated proteins were neutrophil secretions including neutrophil elastase (p < .0001), defensin (p < .0001), and matrix metalloproteinase 8 (p < .0001). The presence of neutrophils was confirmed by the upregulation of IL-8 (p < .001) in tears, a key cytokine known for recruiting neutrophils. Additionally, positive expression of myeloperoxidase was observed in the keratinized eyelid margins of SJS/TEN to validate the presence of neutrophils. Among 41 unique proteins identified by MS, IL-36γ (p < .01) was expressed in three SJS/TEN patients and was confirmed in SJS/TEN tears and eyelid margins by ELISA and IHC, respectively. IL-36γ was specifically expressed in the superficial layers of eyelid margin keratinized conjunctiva. The majority of the significantly downregulated proteins were lacrimal gland secretions such as lacritin (p < .0001) and opiorphin (p < .002). Neutrophil elastase (p < .02) was significantly elevated in patients with severe eyelid margin keratinization. CONCLUSION: Our observations indicate a clear correlation between eyelid margin keratinization and the expression of IL-36γ, potentially mediated by neutrophils recruited via IL-8. Future experimental studies are needed to test the role of therapies targeting IL-8 and/or IL-36γ in reducing eyelid margin keratinization and its associated ocular complications in SJS/TEN.

Cytokeratin profile and keratinocyte gene expression in keratinized lid margins of patients with chronic Stevens-Johnson syndrome.

PURPOSE: To study the cytokeratin profile and keratinization-related gene expression in keratinized lid margins of chronic Stevens-Johnson syndrome (SJS) patients. METHODS: Posterior eyelid margins from 24 chronic SJS patients undergoing mucous membrane grafting and six healthy margins (orbital exenteration, fresh body donors) were studied using immunofluorescence staining (CK10, CK1, filaggrin, transglutaminase 1 (TGM1), (CK19, MUC5AC)) and quantitative PCR (keratinization-related genes-HBEGF, KGF, EGF, TGFα, TGFß, and TNFα). The staining and gene expression were studied separately in the lid margin epidermis (LME) and lid margin conjunctiva (LMC). RESULTS: The expression of CK 1/10, filaggrin, and TGM1 in the LMC was similar to the LME in SJS patients. CK19 was expressed only in the basal epithelial layer of the LMC with loss of MUC5AC expression. Increased expression of KGF (p ≤ 0.056), TNFα (p ≤ 0.02), and TGFα (p ≤ 0.01) was observed in the LME of SJS patients compared to normal LME. LMC of SJS patients showed an increased expression of HBEGF (p ≤ 0.002), EGF (p ≤ 0.0002), KGF (p ≤ 0.02), TNFα (p ≤ 0.04), TGFα (p ≤ 0.003), and TGFß (p ≤ 0.001) compared to normal LMC. Significant differences were observed in the expression of these genes between LME and LMC of SJS patients. These genes were validated using String analysis, which revealed the positive regulation of keratinization. CONCLUSION: In lid margins of SJS, there is an increased expression of keratinization-related genes compared to the normal lid margin. Keratinized LMC shares similar cytokeratin profile and keratinization gene expression as seen in cutaneous epithelium of SJS patients, indicating the possibility of the cutaneous epithelium as a source for keratinized LMC.

Simple Limbal Epithelial Transplantation: Long-Term Clinical Outcomes in 125 Cases of Unilateral Chronic Ocular Surface Burns.

PURPOSE: This study describes the long-term clinical outcomes of autologous simple limbal epithelial transplantation (SLET), a relatively new technique of limbal stem cell transplantation. DESIGN: This was a single-center prospective interventional cases series. PARTICIPANTS: This study included 125 patients, 65 adults and 60 children who developed unilateral limbal stem cell deficiency (LSCD) after suffering with ocular surface burns and underwent SLET between 2010 and 2014. METHODS: A 1-clock hour limbal biopsy sample was obtained from the unaffected eye. At the same sitting, the recipient eye was surgically prepared and the donor tissue was divided into small pieces and transplanted using an amniotic membrane scaffold with fibrin glue. MAIN OUTCOME MEASURES: The diagnosis and outcome in every case was validated by 5 independent masked assessors. The primary outcome measure was restoration of a completely epithelized, stable, and avascular corneal surface. The secondary outcome measure was improvement in visual acuity. Complications, risk factors for failure, and immunohistochemistry analysis of corneas that underwent SLET also were described. RESULTS: At a median postoperative follow-up of 1.5 years (range, 1-4 years), 95 of 125 eyes (76%; 95% confidence interval, 68.5%-83.5%) maintained a successful outcome. Kaplan-Meier analysis revealed a comparable survival probability at 1 year of 80% in adults and 72% in children (P = 0.304). Two-line improvement in visual acuity was seen in 75.2%, and 67% of successful cases attained 20/60 or better vision (P < 0.0001). Progressive conjunctivalization occurred in 18.4% of eyes. The clinical factors associated with failure were identified as acid injury, severe symblepharon, SLET combined with keratoplasty, and postoperative loss of transplants (P ≤ 0.0075). Success rates were comparable among faculty and trainees (P = 0.71). Immunohistochemistry revealed successful regeneration of normal corneal epithelium (CK3(+)/12(+)) without admixture of conjunctiva cells (Muc5AC(-)/CK19(-)) and replenishment of limbal stem cell (ΔNp63α(+)/ABCG2(+)) reserve. CONCLUSIONS: Autologous SLET is an effective, reliable and replicable technique for long-lasting corneal regeneration and vision restoration in unilateral chronic ocular surface burns. Simple limbal epithelial transplantation is probably preferable to other techniques of limbal stem cell transplantation, particularly where cell cultivation facilities are unavailable.

Direct Immunofluorescence Findings and Factors Affecting Conjunctival Biopsy Positivity in Ocular Mucous Membrane Pemphigoid.

PURPOSE: The aim of this study was to describe the direct immunofluorescence (DIF) findings and factors affecting conjunctival biopsy positivity in patients clinically diagnosed with ocular mucous membrane pemphigoid (OMMP). METHODS: This retrospective observational case series included patients with clinical OMMP who underwent conjunctival biopsy for DIF in at least 1 eye between 2018 and 2021 in an institutional setting. The primary outcome measures were association of age and chronic ocular complications with biopsy positivity. RESULTS: Of 61 patients, DIF positivity was seen in 33 (54.1%) clinically suspected cases of OMMP. Of 39 patients who underwent bilateral biopsy, 23 (59%) were positive, of which 12 (52%) were positive in both eyes while 11 (48%) were positive in 1 eye. Of 22 patients who underwent unilateral biopsy, 10 (45%) were positive. Of the 100 biopsied eyes, 45 (45%) were DIF positive. Among the immunoreactants studied, linear deposition of C3 was seen in all 45 positive eyes (100%). Increasing age was significantly associated with higher likelihood of biopsy negativity ( P = 0.032), whereas a greater Sotozono chronic ocular complication score, indicative of disease severity, was associated with low likelihood of biopsy positivity ( P = 0.0042) and lower overall expression of immunoreactants on DIF ( P = 0.0007). CONCLUSIONS: Older patients and patients with more severe ocular surface disease sequelae are likely to have negative DIF results. To optimize the chances of confirming the diagnosis of OMMP by DIF, both eyes should be biopsied early in the disease course. If 1 eye is being biopsied, the less affected eye must be chosen.

Pseudopithomyces Maydicus and Phialophora Chinensis Rare Fungal Keratitis: Case Series, DNA Sequencing, Antifungal Susceptibility Patterns.

PURPOSE: We report two cases of fungal keratitis due to rare melanized fungal pathogens in ocular infection, one is the first case report of keratitis due to Pseudopithomyces maydicus and the second is keratitis due to rare fungal pathogen in ocular infections Phialophora chinensis. METHOD: Conventional mycology during routine diagnostics helped in identifying these rare fungal isolates, following which we proceeded for the confirmation of identification by DNA sequencing and did in-vitro antifungal susceptibility test to understand their susceptibility pattern. The clinical information for these two patients were collected from hospital electronic medical records. RESULTS: We discuss the clinical presentation, treatment given, and clinical outcome in these patients and correlate these with the conventional microbiology and sequencing techniques, which helped in identifying the pathogen and the in-vitro antifungal susceptibility of these rare isolates. We also do a brief literature review for these two rare fungal pathogens. CONCLUSIONS: Pseudopithomyces maydicus and Phialophora chinensis are rare causes of fungal keratitis due to melanized fungi. Both of this fungal keratitis respond well to medical therapy alone if diagnosed and treated early.

Secondary bacterial corneal infection caused by Myroides species in primary fungal keratitis.

A middle-aged male patient presented with a central corneal perforation in a deep stromal infiltrate in his left eye. An emergency therapeutic penetrating keratoplasty was performed. Microbiological evaluation of the corneal scraping specimen revealed septate fungal filaments on stains. However, culture reports after 24 hours from the scraping sample and the excised half corneal button showed growth of gram-negative bacilli. This pathogen was identified as an aerobic, non-fermentative, gram-negative, bacillus by conventional microbiology and confirmed as Myroides species by the VITEK 2 Compact system (bioMérieux, Marcy l'Etoile, France). Susceptibility to chloramphenicol was noted based on which the patient was treated with topical chloramphenicol 0.5%. No recurrence of the infection was noted. This is the first reported case of corneal infection with the Myroides species of bacteria which, heretofore, have been known to cause endocarditis and urinary tract infections.

Multiple conjunctival autografts from the contralateral eye for management of recurrent symblepharon in eyes with unilateral chemical burn.

We present two cases which underwent complex ocular surface reconstruction to achieve a stable ocular surface. Conjunctival autograft (CAG) procedure was required more than once, in addition to simple limbal epithelial transplantation to address extensive symblepharon in the eyes with total unilateral limbal stem cell deficiency secondary to acid ocular burns. These cases demonstrate that multiple CAGs may be harvested from the contralateral unaffected eye to correct recurrent symblepharon without any donor site complications if the correct surgical technique is adopted.

Clinical profile and management of ocular superglue injuries: Case series and review of literature.

PURPOSE: To describe the clinical profile and management of patients with ocular superglue injury (OSI). METHODS: This retrospective study included all patients with OSI who presented at a tertiary eye care institute between 2016 and 2020. Data regarding demographics, clinical profile, and management were collected. RESULTS: A total of 66 eyes of 58 patients (24 children, 34 adults) with a median age of 22.5 years [interquartile range (IQR): 11.3-31] were included. All cases sustained accidental injuries, with domestic injury at home being the most common location of injury among children (79%) and adults (53%) ( P = 0.39). The median visual acuity at presentation was worse in children [0.3 logMAR (IQR: 0.2-0.4)] as compared to adults [0.1 logMAR (IQR: 0.1-0.3)] ( P = 0.03)]. The most common clinical sign at presentation was conjunctival congestion in 77% of eyes (51/66) followed by polymerized glue stuck to the eyelashes and eyelids in 52% of eyes (34/66). The median duration from the time of injury to presentation was 2 hours in both groups. All eyes resolved with medical management. Examination under anesthesia was required in three children (13%) to evaluate the extent of OSI. None of the patients had long-term ocular complications. CONCLUSION: Improper and careless handling of superglue in the domestic setting may cause accidental ocular injuries that require immediate medical attention. OSI represents less severe ocular injuries that respond to medical therapy alone and is not associated with long-term visual morbidity. Modifications in the packaging of superglue containers and awareness about their deleterious effects could prevent these injuries.

Long-term outcomes of glued (sutureless) amniotic membrane transplantation in acute Stevens-Johnson syndrome/toxic epidermal necrolysis: a comparative study.

PURPOSE: To compare the effectiveness and efficiency of a glued (sutureless) technique for amniotic membrane transplantation (AMT) with a traditional sutured one in the setting of acute Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN). METHODS: This retrospective cohort study evaluated all patients diagnosed with SJS/TEN between 2008 and 2020 within our hospital network who received AMT in the acute phase according to our protocol and had at least one ophthalmic follow-up in the chronic phase. Primary outcomes included best-corrected visual acuity (BCVA) at the most recent visit, presence of a severe ocular complication (SOC) via predefined criteria, time to procedure and duration of procedure. Random effects model analysis was used to evaluate the impact of potential covariates on outcome measures. RESULTS: A total of 23 patients (45 eyes) were included: 14 patients (27 eyes) in the AMT suture group and 9 patients (18 eyes) in the AMT glue group. There was no difference between the two groups in BCVA at the most recent visit (p=0.5112) or development of a SOC (p=1.000). The glue method was shorter in duration than the suture method (p<0.001). Random effects model additionally indicated that there was no difference in BCVA at most recent follow-up between patients who had received glued versus sutured AMT (p=0.1460). CONCLUSIONS: Our glued technique for AMT is as effective as our sutured technique in stabilising the ocular surface and mitigating chronic ocular complications in SJS/TEN. The glued technique is also shorter in duration and performed more expediently than the sutured technique.

Case Report: Simultaneous penetrating keratoplasty with autologous simple limbal epithelial transplantation as an alternative to keratoprosthesis.

Introduction and importance: This case report highlights the multidisciplinary approach required to achieve successful anatomical and functional outcomes, in an eye with total limbal stem cell deficiency (LSCD) associated with underlying corneal scarring and thinning. Presentation of case: A 59-year-old gentleman had poor visual recovery in the right eye (RE) following accidental carbide blast, 1-year before presenting to us. The visual acuity was counting fingers and clinical examination revealed cicatricial entropion involving the upper eyelid, total LSCD, corneal scarring with a central descemetocele and cataract in the RE. Prior to ocular surface reconstruction, entropion correction was performed. Three months later, penetrating keratoplasty combined with cataract surgery and intraocular lens implantation (penetrating keratoplasty (PK) triple), with autologous simple limbal epithelial transplantation (SLET) was performed. The visual acuity was 20/100, 18 months after the surgery, with a clear well-epithelized corneal graft and stable ocular surface. Discussion: LSCD is caused by a decrease in the population and /or function of the limbal epithelial stem cells. Limbal stem cell transplantation (LSCT) is warranted in eyes with total LSCD. In eyes with coexisting corneal scarring, LSCT alone may be inadequate to restore the vision. These eyes require simultaneous or sequential lamellar or full-thickness corneal transplantation for visual rehabilitation. Though, the existing literature favors a sequential approach, where LSCT is performed first followed by corneal transplantation, under certain circumstances such as a thin underlying cornea like in our case, corneal transplantation may have to be combined with LSCT to achieve optimal outcomes. Conclusion: Combining autologous SLET with PK can be performed for visual rehabilitation in eyes with unilateral total LSCD and underlying corneal thinning. Corneal and limbal graft survival is prolonged if existing adnexal comorbidities are addressed before any surgical intervention is planned and adequate time interval is allowed for the surface inflammation to subside.

Impact of Symblepharon Management With Ocular Surface Reconstruction on Scleral Lens Fitting in Eyes With Chronic Cicatrizing Conjunctivitis and Keratopathy.

PURPOSE: The aim of this study was to describe the importance of symblepharon release with ocular surface reconstruction (OSR) for optimal fitting of scleral contact lenses (SCLs) in eyes with chronic cicatrizing conjunctivitis (CCC) and keratopathy. METHODS: This retrospective study included 32 eyes with CCC and keratopathy with symblepharon which underwent symblepharon release with OSR and were fitted with SCLs. The primary outcome measure was the improvement in best-corrected visual acuity with SCL wear. RESULTS: A total of 32 eyes of 29 patients (66% men) with a median age of 30.5 years were included. The common causes of CCC were Stevens-Johnson syndrome (66%) and ocular burns (16%). The most common location of symblepharon was superior (59%) with limbal involvement in most eyes (94%). Symblepharon release was combined with mucous membrane grafting (63%), amniotic membrane grafting (31%), or conjunctival autografting (6%). The median interval between symblepharon release with OSR and SCL trial was 15 weeks [interquartile range (IQR): 6-24]. The median best-corrected visual acuity improved from logMAR 1.5 (IQR: 1.2-1.8) to logMAR 1.2 (IQR: 0.6-1.4) with SCLs after symblepharon release with OSR (P < 0.001). The median diameter of the SCL used was 15 mm (IQR: 15-16), with a median base curve of 7.9 mm (IQR: 7.9-8). Symblepharon recurrence was noted in 70% of eyes that underwent amniotic membrane grafting; no recurrence was seen with mucous membrane grafting or conjunctival autografting. CONCLUSIONS: In eyes with CCC with keratopathy and symblepharon, visual rehabilitation is possible with SCLs after symblepharon release with OSR without having to resort to a penetrating corneal procedure.

Safety and Efficacy of Contact Lenses in Eyes After Simple Limbal Epithelial Transplantation.

PURPOSE: The aim of this study was to evaluate the safety and efficacy of contact lenses (CLs) in eyes after simple limbal epithelial transplantation (SLET) for limbal stem cell deficiency (LSCD). METHODS: This retrospective study included 61 eyes with partial or total LSCD which underwent SLET and were fitted with corneal or scleral rigid gas-permeable CLs. The primary outcome measure was best-corrected visual acuity (BCVA) with CLs. RESULTS: The median age at presentation was 22 years. The most common cause of LSCD was chemical injury [47/61 eyes (77%)]. Twenty-seven eyes (44%) were fitted with corneal rigid gas-permeable lenses, while 34 eyes (56%) were prescribed scleral lenses. The median duration of interval between SLET and CL trial was 10 months (interquartile range: 4-17). The median preoperative BCVA was logarithm of minimal angle of resolution (logMAR) 1.8. This improved to logMAR 1 ( P < 0.001) after SLET and to logMAR 0.6 ( P < 0.001) with CLs. Eyes with chemical injury (logMAR 1 vs. 0.6, P = 0.0001), grade 1 (logMAR 0.8 vs. 0.4, P < 0.0001), and grade 2 (logMAR 0.9 vs. 0.6, P = 0.004) corneal scarring had better improvement in BCVA with CLs. No complications were noted until the last follow-up visit. CONCLUSIONS: CLs, both corneal and scleral lenses, provide significant visual improvement in eyes after SLET with residual corneal scarring. These can be safely prescribed in such eyes without any adverse effects. This option can be considered before offering keratoplasty in these eyes.

Vortex Keratopathy as a Presenting Feature of Ocular Mucous Membrane Pemphigoid.

PURPOSE: The aim of this study was to describe the presenting feature of vortex keratopathy in 3 patients with biopsy-proven ocular mucous membrane pemphigoid (OMMP). METHODS: The first patient was a 52-year-old woman with chronic redness and foreign body sensation for 3 years who presented with unilateral vortex keratopathy. Seven months later, in the same eye, she developed conjunctival signs suggestive of OMMP. The second patient was a 33-year-old woman with similar chronic symptoms that were exacerbated by pterygium surgery. Clinical examination revealed vortex keratopathy in the right eye with subtle conjunctival signs suggestive of OMMP. The third patient was a 70-year-old woman with complaints of repeated episodes of redness and foreign body sensation for 18 months who presented with vortex keratopathy in the right eye and conjunctival signs suggestive of OMMP in the same eye. To confirm the clinical diagnosis, bilateral conjunctival biopsy was performed in all patients. RESULTS: OMMP was diagnosed based on conjunctival signs and confirmed on direct immunofluorescence positivity, demonstrating antibodies characteristic and diagnostic of OMMP in the basement membrane zone. A unique feature that preceded or coexisted with the conjunctival signs was unilateral vortex keratopathy seen in all 3 patients, independent of the stage of the disease at which they presented. CONCLUSIONS: Vortex keratopathy can be a presenting feature in patients with OMMP. A complete ocular surface examination, especially checking the medial canthus for keratin and the inferior fornix for foreshortening, is necessary. Conjunctival biopsy should be performed in all cases to confirm the clinical diagnosis wherever required.

Carbide Gun-Related Ocular Injuries: A Case Series.

PURPOSE: The purpose of this study was to report a case series of sight-threatening ocular injuries caused by calcium carbide guns used as fire crackers. METHODS: Medical records of 15 eyes of 14 patients with ocular injuries caused while using carbide guns, visiting the Institute, from January 2021 to January 2022, were retrospectively reviewed. The collected data included patients' demography (age, sex), presenting ophthalmic features, management, and outcome. Grade I and II ocular injuries were managed medically. All grade III-V injuries were managed using Amniotic Membrane Transplantation. RESULTS: All patients were male. The mean age of the patients was 23.57 ± 11.76 years. According to the Dua classification, 5 eyes (33.3%) had Grade I-II ocular surface burns, 3 eyes (20%) had grade III burns, and 7 eyes (46.6%) had grade IV-VI burns. Presenting visual acuity ranged between hand movements to 20/50, and in 6 eyes (40%), the visual acuity was ≤20/200. Five eyes were managed medically alone, and 10 (66.6%) eyes needed surgical intervention (Amniotic Membrane Transplantation). After a mean follow-up of 14.23 ± 11.92 weeks, complete epithelization was seen in 10 eyes (66.6%). Partial limbal stem cell deficiency and its sequelae such as conjunctivalization of the cornea were noted in 7 eyes (46.6%). CONCLUSIONS: Calcium carbide-related ocular injuries can result in corneal blindness secondary to limbal stem cell deficiency in young individuals. Loss of vision in this age group can lead to loss of economic productivity and cosmetic disfigurement. More advocacy efforts are thus needed to prevent these injuries.

Contact lenses in dry eye disease and associated ocular surface disorders.

Dry eye disease (DED) is prevalent in all age groups and is known to cause chronic ocular discomfort and pain, and greatly affects the quality of life. Patients with ocular surface disease (OSD) may also have reduced tear secretion due to lacrimal gland damage, thus leading to aqueous deficient DED. Even with conventional management modalities such as lubricating eyedrops, topical corticosteroids, autologous serum eyedrops, or punctal plugs, many patients continue to suffer from debilitating symptoms. Contact lenses are increasingly being used in OSD providing surface hydration, protection from environmental insults, mechanical damage from abnormal lids, and as a modality for constant drug delivery to the ocular surface. This review describes the role of soft lenses and rigid gas-permeable scleral lenses in the management of DED associated with OSD. The efficacy of contact lenses, lens selection, and optimal lens fit are reviewed for specific indications.

Role of topical and systemic immunosuppression in aqueous-deficient dry eye disease.

Immunosuppression in aqueous-deficient dry eye disease (ADDE) is required not only to improve the symptoms and signs but also to prevent further progression of the disease and its sight-threatening sequelae. This immunomodulation can be achieved through topical and/or systemic medications, and the choice of one drug over the other is determined by the underlying systemic disease. These immunosuppressive agents require a minimum of 6-8 weeks to achieve their beneficial effect, and during this time, the patient is usually placed on topical corticosteroids. Antimetabolites such as methotrexate, azathioprine, and mycophenolate mofetil, along with calcineurin inhibitors, are commonly used as first-line medications. The latter have a pivotal role in immunomodulation since T cells contribute significantly to the pathogenesis of ocular surface inflammation in dry eye disease. Alkylating agents are largely limited to controlling acute exacerbations with pulse doses of cyclophosphamide. Biologic agents, such as rituximab, are particularly useful in patients with refractory disease. Each group of drugs has its own side-effect profiles and requires a stringent monitoring schedule that must be followed to prevent systemic morbidity. A customized combination of topical and systemic medications is usually required to achieve adequate control, and this review aims to help the clinician choose the most appropriate modality and monitoring regimen for a given case of ADDE.

Sequelae of carbide-related thermo-chemical injury: A retrospective analysis.

Purpose: To describe the outcomes of eyes with calcium carbide (CaC2)-related thermo-chemical injury. Methods: This study included 28 eyes of 23 patients who presented with calcium carbide-related ocular burns. Only patients with more than three months of follow-up were included. Group A included 16 eyes with Dua's Grade I-III burns, while Group B included 12 eyes with Grade IV-VI burns. Electronic medical records were reviewed to provide data on the etiology of burn, presenting clinical signs and visual acuity, sequelae, and surgical interventions performed, both in the acute and chronic phases. Results: The overall mean age was 28.48 ± 11.8 years. Fifteen patients were injured while using carbide to create an explosion to scare away animals on farms. The median presenting BCVA (best-corrected visual acuity) in Group A (20/160) was significantly better than in Group B [(20/2000) (P = 0.002)]. Five eyes in Group A and one eye in Group B underwent medical management. There was no difference in the duration of follow-up for both groups (P = 0.24). The median final BCVA in Group A (20/32) was significantly better than in Group B [(20/200) (P = 0.02)]. Two eyes in Group A and nine eyes in Group B developed LSCD. Two eyes in Group B were phthisical at the last visit. Conclusion: Calcium carbide-related ocular injuries can result in significant visual morbidity in young adults. Early presentation and management may improve outcomes. Prevention of these injuries by increasing awareness and increasing advocacy efforts is necessary.

Optimization and evaluation of tear protein elution from Schirmer's strips in dry eye disease.

PURPOSE: Extraction of tear protein from Schirmer's strip is a prerequisite for the proper identification and screening of biomarkers in dry eye disease. The study compares different methods of extraction of tear proteins from the Schirmer's strip. METHODS: Reflex tear was collected from healthy controls (HC; n = 12), Stevens-Johnson syndrome (SJS; n = 3) and dry eye disease (DED; n = 3) patients using capillary tube. This tear was used to measure the volume absorbed by Schirmer's strip per microliter. Different buffers (6) were used to compare the protein yield from the Schirmer's strip in four different conditions. The tear proteins extracted using the highest protein yield buffer were analyzed by mass spectrometry. RESULTS: A linear relationship between the tear volume and wetting length was observed (r = 0.0.997, n = 6). The highest yield was observed after incubation of the Schirmer's strip in 100 mM ammonium bicarbonate (ABC) with 0.25% Nonidet P-40(NP-40) at 4°C for an hour (P < 0.00005). The in-solution digestion of tear eluted in the above condition 100 Mm ABC + 0.25% NP-40 with one-hour incubation yielded a total of 2119 proteins in HC, SJS, and DED. The unique protein observed in SJS and DED was 0.6% and 17.9%, respectively. The significantly expressed proteins are associated with innate immune response, proteolysis, wound healing, and defense response. CONCLUSION: A method for extraction of protein from Schirmer's strip was optimized for increase in protein yield from the tear sample. SJS and DED tear samples have unique protein signature. The study will aid in better design of tear protein-based experimental study.

Demographic profile and clinical characteristics of patients presenting with acute ocular burns.

Purpose: To study and compare the demographic and clinical profile of acute ocular burns (AOB) in children and adults. Methods: This retrospective case series included 271 children (338 eyes) and 1300 adults (1809 eyes) who presented to two tertiary eye care centers within one month of sustaining AOB. Data regarding demographics, causative agents, severity of injury, visual acuity (VA), and treatment were collected and analyzed. Results: Males were more commonly affected particularly among adults (81% versus 64%, P < 0.00001). Among children, 79% sustained domestic injuries, whereas 59% of adults had work-place injuries (P < 0.0001). Most cases were due to alkali (38%) and acids (22%). Edible lime (chuna, 32%), superglue (14%), and firecrackers (12%) in children, and chuna (7%), insecticides, lye, superglue (6% each), toilet cleaner (4%) and battery acid (3%) in adults, were the main causative agents. The percentage of cases with Dua grade IV-VI was greater in children (16% versus 9%; P = 0.0001). Amniotic membrane grafting and/or tarsorrhaphy were needed in 36% and 14% of affected eyes in children and adults, respectively (P < 0.00001). The median presenting VA was logMAR 0.5 in children and logMAR 0.3 in adults (P = 0.0001), which improved significantly with treatment in both groups (P < 0.0001), but the final VA in eyes with Dua grade IV-VI burns was poorer in children (logMAR 1.3 versus logMAR 0.8, P = 0.04). Conclusion: The findings clearly delineate the at-risk groups, causative agents, clinical severity, and treatment outcomes of AOB. Increased awareness and data-driven targeted preventive strategies are needed to reduce the avoidable ocular morbidity in AOB.