Comparison of Ishihara Booklet with Color Vision Smartphone Applications.

PURPOSE: To compare the standard Ishihara booklet with color-vision-testing smartphone applications. METHODS: A prospective observational diagnostic study on 42 normal trichromats and 38 color-deficient subjects. Patients were presented with three color vision tests in random order: an Ishihara test booklet and two color-vision-testing smartphone applications: Eye2Phone and the Color Vision Test application (CVT app). Sensitivity and specificity of the electronic tests was compared with Ishihara results, and in each one of these applications every plate was individually analyzed for success/failure rate. RESULTS: Average age was 42.7 ± 12.9 years. There were 57 males (71.2%). Sensitivity and specificity of each test was 100% (38/38) and 95.2% (40/42) for the Eye2Phone, and 100% (38/38) and 54.8% (23/42) for the CVT app. There was no significant difference between the Ishihara booklet and the Eye2Phone (p = 0.500), with a high kappa measure of agreement (0.950, p < 0.001). The CVT app was significantly different than both other tests (p < 0.001) with a low kappa measure of agreement (0.535 with the Ishihara and 0.575 with the Eye2Phone). Of the 21 tested plates, color-deficient subjects failed 11.8 ± 3.1 plates in the Ishihara booklet and 14.1 ± 2.1 plates in the Eye2Phone (p < 0.001). Significant plate-specific differences for the color-deficient group were found in plate numbers 3, 6, 7, 8, 9, 15, and 16. Both tests were poorly able to give an indication of the specific dichromatism type. The Ishihara booklet was rated more comfortable and clearer than the Eye2Phone in color-deficient subjects. The CVT app was rated lowest for comfort and clarity in both groups. CONCLUSIONS: Smartphone applications testing for color vision deficiency are readily available; however, users of these apps should be aware that some may have different sensitivity for detection of color vision deficiency compared to Ishihara booklet, limiting their usefulness for clinical use. Therefore, further validation of these applications is required.

Uncorrected amteropia among children hospitalized for headache evaluation: a clinical descriptive study.

BACKGROUND: Headache is a common complaint in children occasionally requiring hospital admission. The purposes of the present study were to analyze the prevalence of uncorrected ametropia in children with headache admitted to the hospital, and evaluate the importance of refraction assessment as part of their evaluation. METHODS: A retrospective review of children admitted to the Tel Aviv Medical Center for headache evaluation from December 2008 to March 2013, in whom the only abnormality found was an uncorrected refractive error. RESULTS: During the study period 917 children with headache were hospitalized for evaluation and 16 (1.7%) of them (9 boys, mean age 12 years, range 8-18 years) were found to have an uncorrected ametropia. Average headache duration was 4 months (range, 1 week to 1 year) and mean follow-up was 15 months (range, 1 month to 3 years). Twelve (75%) children had brain imaging and 4 children (25%) had a lumbar puncture before their refractive abnormality was identified. Anisometropia and myopia were the most common refractive errors encountered (n = 10 each), followed by hyperopia (n = 6) and astigmatism (n = 3). Despite having uncorrected refractive errors most children (n = 10) did not complain of any visual difficulty. All children were given proper refractive correction and 14 of them reported complete headache resolution on re-examination one month later. CONCLUSIONS: Uncorrected ametropia is a possible cause of headache among hospitalized children. Therefore, complete ophthalmic evaluation, which includes proper refraction assessment, is important as it can identify a treatable headache etiology. Children without visual difficulty should be equally evaluated, as many children with headache and uncorrected amteropia do not have vision complaints.

The role of neuroimaging in the evaluation process of children with isolated sixth nerve palsy.

PURPOSE: The purpose of this study was to assess the role of neuroimaging in identifying the etiology of pediatric isolated sixth nerve palsy (SNP). METHODS: A retrospective cohort study was conducted of all patients younger than 18 years of age with an isolated SNP seen at our medical center between 2003 and 2011. RESULTS: Sixteen children (nine girls; mean age, 4.5 years) with isolated SNP were identified during an 8-year period. Only cases with normal optic disk appearance and otherwise normal neurological examination were included into this study. Thus, 12 other children with SNP were excluded: ten children with papilledema, one child who developed a SNP following a resection of a brain tumor, and one with hydrocephalus and a shunt malfunction. All cases of isolated SNP were unilateral (ten left eyes). The most common cause for the SNP in these children was a tumor that was found in five patients. Other etiologies encountered in decreasing frequencies were: benign recurrent SNP (in four children), postviral or vaccination (in three children), and one case each of post trauma, Chiari malformation, congenital, and undetermined. Children who were found to have a tumor (9.9 ± 5.5 years) were significantly older (P = 0.019) than children who did not have a tumor (2.1 ± 1.8 years). CONCLUSIONS: Isolated SNP can be the presentation of a brain tumor in children, and therefore, early neuroimaging of the brain is recommended, especially in older children.

Color Doppler imaging of eyes with persistent fetal vasculature.

BACKGROUND: Eyes with persistent fetal vasculature (PFV) may be mistaken for retinoblastoma and provide a diagnostic challenge. OBJECTIVE: This study aimed to evaluate the role of color Doppler imaging (CDI) in children with persistent fetal vasculature. MATERIALS AND METHODS: Eyes with a diagnosis of PFV were evaluated by CDI. RESULTS: Twenty eyes of 17 children were included. All had a confirmed diagnosis of PFV based on one or more of the following: clinical findings on funduscopy, characteristic findings on imaging modalities (ophthalmic gray-scale US, CT and/or MRI), typical findings observed intraoperatively, and histopathological analysis (after enucleation in one case). Blood flow within the PFV was demonstrated in 19 eyes in this series. CONCLUSION: CDI is a noninvasive diagnostic tool that may add useful information on the presence of blood flow within the PFV and may substantiate the diagnosis of PFV in cases of uncertainty.

A novel device for assessment of amblyopic risk factors in preverbal and verbal children-a pilot study.

OBJECTIVES: This paper evaluates the accuracy of the Eye-N-JOY (ENJ), a novel device (Patent no. US 9844317 B2), for identifying the presence of amblyopic risk factors. This device was developed to assess both visual acuity, ocular alignment, and eye movement; all while watching images on a tablet screen. METHODS: A prospective, single-center, comparison study. Participants were examined by the ENJ first and then underwent a comprehensive full eye examination by pediatric ophthalmologists including cycloplegic refraction. Both the technician operating the ENJ and the physicians were masked to each other's findings. Children aged 18-72 months (1.5 to 6 years) attending a tertiary medical center for a full standard pediatric ophthalmology examination were included. The visual acuity and alignment were compared between the ENJ and the gold standard full ophthalmologic examination. The differences were noted, and the sensitivity and specificity were calculated. RESULTS: A total of 51 children were enrolled, 33 (64.7%) girls, aged 18-72 months. All children successfully completed the examination by the ENJ. No significant difference between the ENJ and the reference examination was detected in visual acuity measurements in both eyes (Pv = 0.553 for the right eye and 0.803 for the left). Overall agreement between all referral indications between the ENJ and reference examination was 84.3%, with 90.9% agreement in VA referral criteria and 90.1% in alignment referral criteria. CONCLUSIONS: Eye-N-Joy can reliably examine both visual acuity and ocular misalignment in verbal and pre-verbal children.

Idiopathic intracranial hypertension in children: visual outcome and risk of recurrence.

PURPOSE: Idiopathic intracranial hypertension (IIH) is a disorder associated with increased intracranial pressure without evidence of a space-occupying lesion and with normal cerebrospinal fluid constituents. The disease is rare in the pediatric population. In this study, we assessed the visual outcome of children with IIH and the risk of recurrence. METHODS: This single-center observational retrospective cohort study included 90 children younger than 18 years of age who satisfied the modified Dandy criteria for the diagnosis of IIH. Upon follow-up, the treatment was discontinued when patients were free of symptoms such as headaches, transient visual obscurations or tinnitus, and when examination revealed no evidence of papilledema. The main outcome measures were visual acuity and visual field outcomes as well as risk of recurrence. RESULTS: The mean follow-up was 30.65 months (range 1.15-172.6 months, standard deviation 27.47 months). Special grading scales were devised for visual acuity and visual field scores. The mean visual acuity score improved from 4.7 ± 0.62 to 4.87 ± 0.44 (p = 0.003).The mean visual field score improved from 3.41 ± 0.8 to 3.52 ± 0.75 (p = 0.21). The recurrence rate was 23.7%, and the risk of recurrence was highest within the first 18 months after diagnosis of IIH. CONCLUSIONS: These study results suggest that pediatric patients with IIH have a favorable visual outcome in terms of both visual acuity and visual field. If there is any recurrence, it is most likely to occur during the first 18 months after diagnosis.

Outcomes of half-width vertical rectus transposition augmented with posterior fixation sutures for sixth cranial nerve palsy.

AIM: To describe the experience with half-width vertical muscles transposition (VRT) augmented with posterior fixation sutures. METHODS: The clinical charts of all patients, who underwent half-width VRT augmented with posterior fixation sutures for sixth cranial nerve palsy from January 2003 to December 2018, were retrospectively reviewed. For each patient, pre- and post-operatively, the largest measured angle was used for the calculations, usually resulting with the angle for distance, except in young infants, where measurements were made at near fixation using the Krimsky test. RESULTS: Fifteen patients met the inclusion criteria for the study, of them 9 (60.0%) had also medial rectus muscle recession at the time of surgery. Mean follow-up period was 21.4±23.2mo (range 1.5-82mo). Preoperative mean esotropia was 51.3±19.7 prism diopter (PD; range 20-90 PD). Postoperative mean deviation on final follow-up was 7.7±20.2 PD (range -40 to 35 PD; P=0.018). In all patients with preoperative abnormal head position, improvement was noted. Ten (66.7%) patients had improvement in abduction and 10 (66.7%) patients reported improvement in their diplopia, by final follow-up. The addition of medial rectus recession was correlated with a larger change in postoperative horizontal deviation compared to baseline (P=0.026). Two (13.3%) patients developed a vertical deviation in the immediate postoperative period which had resolved in one of them. CONCLUSION: Half-width VRT augmented with posterior fixation suture, with or without medial rectus muscle recession, is an effective and safe procedure for esotropia associated with sixth cranial nerve palsy. A major improvement in the angle of deviation is expected. Most patients will have improvement in their abnormal head position and diplopia.

Reduced stereoacuity as a predictor for clinically significant convergence insufficiency.

BACKGROUND: Stereoacuity relies on accurate binocular alignment. Convergence insufficiency (CI) a binocular motor disorder, interferes with near work. OBJECTIVE: To investigate the association between convergence amplitude (CA) and stereoacuity in a large paediatric cohort. METHODS: Retrospective chart review included patients aged 6-17 years; excluded patients with amblyopia, manifest strabismus or visual acuity <20/30 in either eye. Stereoacuity, measured by Randot test was defined as normal (≤40arcsec), subnormal (50-400arcsec) and poor (>400 arcsec). CA, measured using base out prism bar was defined by fusion break point (BP) and recovery point (RP), as none (BP=0), poor (BP <20 prism diopter (PD)), borderline (BP <30 PD or RP <20 PD), good (BP ≥30 PD and RP ≥20 PD) and excellent (does not break at 40PD). RESULTS: In 2200 subjects included, we found an increased prevalence of normal stereoacuity as convergence ability improves (χ2 test, p<0.001) with a negative correlation between stereoacuity and BP (Pearson correlation -0.13, p<0.001).CI was significantly associated with below normal stereopsis OR 1.86 (95% CI 1.3 to 2.7, p<0.001). Conversely, prevalence of CI was similar, whether or not CI-symptoms were reported. Follow-up data of at least 2.5 years from presentation was available for a small subgroup of 21 patients treated for CI. Convergence improved in 14 (66%), rate of normal stereoacuity increased from 29% at baseline to 76% at last follow-up (p=0.006). CONCLUSIONS: CA affects stereoacuity function in children. Evaluation of CA is required in all cases with poor stereoacuity, especially when other etiologies are amiss. The role of convergence improvement exercise on stereoacuity warrants further investigation.

Pediatric Publication Trends in Leading General Ophthalmology Journals for 20 Years.

PURPOSE: To evaluate trends in the representation of pediatric-related articles in leading general ophthalmology journals for 20 years. METHODS: A list of all relevant publications from five top-ranking general ophthalmology journals (Ophthalmology, JAMA Ophthalmology, American Journal of Ophthalmology, British Journal of Ophthalmology, and Acta Ophthalmologica) between January 1997 and December 2016 was retrieved using the PubMed search engine. Articles captured by the age filter "child: birth-18 years" were considered pediatric. The annual pediatric publication rate was calculated as the fraction of pediatric articles out of the total number of articles within each year for every journal. A linear mixed effects model was applied to determine the trend in the pediatric publication rate during the study period. RESULTS: A total of 37,181 publications were included in the analysis, of which 7,828 (21.1%) were classified as "pediatric." During the study period, there was a statistically significant decrease in pediatric publication rates, with an annual absolute decrease of 0.23% (P = .01), yielding relative reduction by approximately 18% over the past two decades. CONCLUSIONS: Representation of pediatric articles progressively decreased in general ophthalmology journals. This trend has major implications regarding exposure of non-pediatric ophthalmologists to the new developments in pediatric management. In addition, this may imply a difficulty to publish pediatric-related articles in high-ranking general ophthalmology journals. [J Pediatr Ophthalmol Strabismus. 2020;57(2):78-84.].

Accuracy of the Ultrasound Biomicroscopy Bag/Balloon Technique in Locating Horizontal Extraocular Muscle Insertions Before and After Strabismus Surgery.

PURPOSE: To investigate the accuracy of high frequency ultrasound biomicroscopy using the bag/balloon technique to locate recti muscle insertions before and after strabismus surgery. METHODS: This was a prospective masked study. The distance from the limbus to horizontal recti muscle insertions was measured by caliper intraoperatively and ultrasound biomicroscopy preoperatively and during follow-up. Accuracy was defined as the difference between ultrasound biomicroscopy and caliper measurements. RESULTS: Thirty-nine muscles (19 medial rectus and 20 lateral rectus) of 22 patients were included. The mean age of the patients was 34.7 ± 15.5 years (range: 18 to 78 years). Follow-up measurements were available for 25 muscles: 12 muscles were recessed and 13 were resected/advanced. Twelve of the included muscles underwent prior surgery. There was a strong correlation between preoperative mean ultrasound biomicroscopy and caliper measurements (P < .001, rp = 0.872) without significant difference between the accuracy of identification of medial rectus and lateral rectus muscles (P = .116 and .377, respectively). On average, postoperative ultrasound biomicroscopy measurements of recessed muscles were 1.15 mm greater than caliper measurements at the end of surgery (P = .003), whereas the mean difference in the resected muscles was not statistically significant (-0.07 mm, P > .999). Overall, in 16 of 25 muscles (64%), the differences between the postoperative measurements and the end of surgery measurements were less than 1 mm. There was no correlation between the accuracy and the time of ultrasound biomicroscopy after surgery (P = .516). CONCLUSIONS: The ultrasound biomicroscopy bag/balloon technique is an accurate and reliable method of locating recti muscle insertions before and after strabismus surgery. Ultrasound biomicroscopy may assist strabismologists in planning repeated operations. [J Pediatr Ophthalmol Strabismus. 2020;57(1):12-20.].

Home use of binocular dichoptic video content device for treatment of amblyopia: a pilot study.

PURPOSE: To evaluate the efficacy of the BinoVision home system as measured by improvement of visual acuity in the patient's amblyopic eye. METHODS: An open-label prospective pilot-trial of the system was conducted with amblyopic children aged 4-8 years at the pediatric ophthalmology unit, Tel-Aviv Medical Center, January 2014 to October 2015. Participants were assigned to the study or sham group for treatment with BinoVision for 8 or 12 weeks. Patients were instructed to watch animated television shows and videos at home using the BinoVision device for 60 minutes, 6 days a week. The BinoVision program incorporates elements at different contrast and brightness levels for both eyes, weak eye tracking training by superimposed screen images, and weak eye flicker stimuli with alerting sound manipulations. Patients were examined at 4, 8, 12, 24, and 36 weeks. RESULTS: A total of 27 children were recruited (14 boys), with 19 in the treatment group. Median age was 5 years (range, 4-8 years). Mean visual acuity improved by 0.26 logMAR lines in the treatment group from baseline to 12 weeks. Visual acuity was improved compared to baseline during all study and follow-up appointments (P < 0.01), with stabilization of visual acuity after cessation of treatment. The sham group completed 4 weeks of sham protocol with no change in visual acuity (P = 0.285). The average compliance rate was 88% ± 16% (50% to 100%) in treatment group. CONCLUSIONS: This pilot trial of 12 weeks of amblyopia treatment with the BinoVision home system demonstrated significant improvement in patients' visual acuity.

Refractive Changes Induced by Strabismus Corrective Surgery in Adults.

Purpose. To investigate refractive changes after strabismus correction procedures among adults. Methods. Retrospective chart review of adult patients who had horizontal recti muscles surgery with preoperative and postoperative cycloplegic refraction measurements. The preoperative refraction was mathematically subtracted from the postoperative refraction, and the induced refractive changes were statistically analyzed. Vector analysis was used to examine the magnitude of the toric change. The proportion of clinically significant refractive change was evaluated as well. Results. Thirty-one eyes from 22 subjects met the criteria and were included in the final analysis. A significant postoperative refractive change of the spherical equivalent towards myopia and a change of the astigmatism in the with-the-rule direction were observed. In a subset of 9 cases a third cycloplegic refraction measurement demonstrated stable refraction compared to the 1-month postoperative measurement. In 10 cases of single eye surgery, significant refractive changes were observed only in the operated side when compared to the sound eye. The induced surgical refractive change was of clinical significance (≥0.5 D) in 11 eyes of 9 patients (40.9% of patients). Conclusions. Refractive changes are a significant side effect of horizontal strabismus corrective surgery among adults. Therefore, patients should be informed about it prior to surgery and should be rerefracted in the postoperative period.

A paired comparison study on refractive changes after strabismus surgery.

PURPOSE: To quantify refractive changes following horizontal lateral rectus recession and medial rectus resection surgery and to investigate the causes of these changes. METHODS: The medical records of patients who underwent unilateral horizontal lateral rectus recession and medial rectus resection for exotropia by a single surgeon over a period of 14 years were reviewed retrospectively. Using vector analysis, refractive changes in operated eyes (cases) were compared to changes in the sound eyes (controls). The main outcome measures were differences in mean change of refractive parameters and the proportion of clinically significant changes. RESULTS: A total of 31 subjects (median age, 13.6 years; interquartile range, 8.8-19.8 years) were included. A significantly higher magnitude of refractive changes was observed in the operated eyes (P = 0.001). In addition, the proportion of cases with clinically significant change in sphere or cylinder was significantly higher in the operated eyes compared to the sound eyes (48% vs 10% [OR = 2.31, P = 0.002] and 32% vs 10% [OR = 5.0, P = 0.039], resp.). CONCLUSIONS: Horizontal strabismus surgery is associated with refractive changes that might be of clinical significance. Pediatric ophthalmologists should consider re-refraction 1 month postoperatively.

Extraocular muscle damage from dental implant penetration to the orbit.

PURPOSE: To demonstrate an unusual case of orbital trauma due to dental surgery complication. OBSERVATIONS: An elderly patient who underwent dental implantation to the zygomatic bone was hospitalized in the ophthalmology department with impaired abduction of her right eye, also evident on ocular examination. Head computed tomography demonstrated damage to the lateral rectus and to the inferior oblique muscles. Clinical assessment determined these muscles could not be repaired and reattached. The extent of irreversible damage in the patient was permanent limitation in movement of her affected eye with subsequent strabismus. CONCLUSIONS AND IMPORTANCE: Accurate pre-operative planning of dental zygomatic implant insertion, as well as selecting the size and direction of the implant, are imperative. Moreover, performing surgery in multidisciplinary centers with oculofacial plastic surgeons in such cases, may reduce risk of this complication, make it a safer procedure, and allow immediate treatment when required.

Do Intraocular Pressure Measurements Under Anesthesia Reflect the Awake Condition?

BACKGROUND: Anesthesia or sedation is needed when intraocular pressure (IOP) measurement is required in certain circumstances. The effect of different anesthetic regimens on the IOP is still debatable. We aimed to evaluate alterations in the IOP under anesthesia with either propofol or different end-tidal concentrations of sevoflurane, when compared with the awake state. METHODS: The IOP was measured in both eyes of 20 adult patients undergoing extraocular ophthalmic surgeries at 5 timepoints: before the induction of general anesthesia (under topical anesthesia), after the induction using propofol target-controlled infusion, and under 3 end-tidal concentrations of sevoflurane (0.5%, 2%, and 5%), either in a decreasing (group A) or an increasing (group B) concentration order. RESULTS: With either propofol or sevoflurane anesthesia, the IOP did not differ significantly from the measurement performed during the awake state (no anesthesia), regardless of the concentration of sevoflurane used (in the range of 0.5% to 5%) or the order of sevoflurane administration (from low to high concentration or vice versa). CONCLUSIONS: These data suggest that propofol and sevoflurane are valid anesthetic agents for the evaluation of IOP in adults when anesthesia is needed.

Mapping of a gene causing brittle cornea syndrome in Tunisian jews to 16q24.

PURPOSE: To map the gene that causes brittle cornea syndrome (BCS). METHODS: Five patients from four families, all of Jewish Tunisian origin, were recruited into the study. Four of the five patients had red hair. DNA from the five patients and 104 control chromosomes was typed with seven 16q polymorphic markers surrounding the hair color gene, MC1R. RESULTS: A common haplotype in the homozygous state, comprising five markers spanning 4.7 Mb on chromosome 16q24, was found in all five patients but in none of the control subjects (P < 0.00001). CONCLUSIONS: The gene that causes BCS maps to a 4.7-Mb interval, between the markers D16S3423 and D16S3425 on 16q24.

Hydrostatic pressure as an office procedure for congenital nasolacrimal duct obstruction.

BACKGROUND: The estimated incidence of congenital nasolacrimal duct obstruction (CNDO) is 5% to 20%. We examined our success rate of treating CNDO with hydrostatic pressure (the Crigler method) as an office procedure. METHODS: A total of 742 children with CNDO initially were treated noninvasively with hydrostatic pressure. The procedure was safely repeated up to 3 times, with an interval of at least 1 week, if the condition persisted. RESULTS: Success was defined as no epiphora or discharge. The success rate for the entire study group was 45% for children up to 1 year of age. The ducts were opened in 46% (343/742) at the first attempt of hydrostatic pressure, in 35% (42/120) at the second attempt, and in 38% (8/21) at the third attempt. When the maneuver was performed in patients younger than 2 months of age, the success rate of the first attempt was 56%, decreasing to 46% in children 2 to 6 months of age and to 28% older than 6 months of age. CONCLUSIONS: Hydrostatic pressure is an effective way of resolving infant CNDO and shortening the duration of the associated morbidity. The success rate is higher when the procedure is conducted in patients up to 2 months of age. Nevertheless, we recommend this approach for every infant presenting with CNDO at the first office visit, even after 6 months of age. Procedures can be repeated safely and successfully.

Macular Thickness Following Strabismus Surgery as Determined by Optical Coherence Tomography.

PURPOSE: To investigate macular changes following strabismus surgery by using optical coherence tomography (OCT). METHODS: The authors prospectively evaluated 60 eyes of 30 patients undergoing unilateral extraocular muscle surgery. OCT measurements employing the fast macular thickness mapping protocol were performed 1 day prior to surgery and 1 day postoperatively. Postoperative macular changes in the study eye that was operated on (n = 30) were compared with the fellow control eye (n = 30, controls). RESULTS: There was an increase in mean ± standard deviation central foveal thickness (CFT) in the operated eyes, from 201.63 ± 18.36 µm at baseline to 206.03 ± 22.73 µm postoperatively (P = .024). Preoperative and postoperative perifoveal outer temporal quadrant thicknesses were 220.10 ± 16.23 and 225.80 ± 14.78 µm, respectively (P = .009). There were no differences between preoperative and postoperative retinal thickness measurements for all measured areas in the control eyes. Eyes that underwent surgery involving the rectus muscles showed a trend toward a greater CFT increase compared with eyes that had oblique muscle surgery (P = .070). CONCLUSIONS: The authors found subclinical increases in the foveal and perifoveal macular thicknesses following extraocular muscle surgery. These findings could be attributed to change in the mechanical forces caused by the new position of the extraocular muscles and transmitted via the sclera or, alternatively, to postoperative inflammation and alterations in the blood-retinal barrier. The clinical implications of these findings remain to be clarified.

Early loss of monocanalicular silicone tubes in congenital nasolacrimal duct obstruction: incidence, predictors, and effect on outcome.

PURPOSE: To study predictors and implications on outcome of premature silicone tube-loss, a post-operative complication of monocanalicular intubation (MCI) performed for treatment of congenital nasolacrimal duct obstruction (CNLDO). METHODS: We conducted a retrospective analysis of cases of post-operative loss of monocanalicular silicone tubes occurring at one medical center from January 2007 to December 2013. RESULTS: During the study period monocanclicular silicone tubes were lost in 24/54 eyes (44%) of 19/46 children. Multivariate regression analysis identified bilateral intubation as an important predictor of early tube-loss (r=0.54, P=0.006). Seven of eight (88%) children who had both eyes intubated prematurely lost their tubes compared to 12/38 (32%) children who had unilateral intubation (P=0.005). Treatment success was lower in eyes with early tube-loss (17/24 eyes, 71%) compared to eyes with full tube retention (25/30 eyes, 83%), however this difference was not statistically significant (P=0.333). In our study, treatment outcome correlated with duration of intubation (r=0.51, P=0.002). Surgical success was achieved in 33/39 eyes (85%) in which the tubes were retained at least 2 months compared to 7/15 eyes (47%) with shorter period of intubation (P=0.012). CONCLUSIONS: Spontaneous tube-loss is a post-operative complication of monocanalicular silicone intubation that can occur more frequently than previously reported in certain populations. Tube-loss occurring soon after surgery is often associated with persistent symptoms and increased need of reoperation.

Increased prevalence of ametropia in children with neurofibromatosis type 1 disease.

Neurofibromatosis type 1 disease is an autosomal dominant disorder associated with numerous ophthalmic and systemic manifestations. Organic causes of visual loss include optic pathway gliomas, orbital plexiform neurofibroma, and glaucoma. In this study, the authors analyzed the prevalence of ametropia as a cause for visual loss in children with neurofibromatosis type 1 disease younger than age 12 years compared to matched controls. Only children with normal neuroimaging were evaluated. Myopia, hyperopia, astigmatism, and anisometropia were all more common in children with neurofibromatosis type 1 disease; however, statistically significant differences were observed in mild myopia and astigmatism alone. A higher need for optical correction was found in children with neurofibromatosis type 1 disease (33.3% vs 17.1% of controls, P = .049). In conclusion, children with neurofibromatosis type 1 disease have a higher prevalence of ametropia, especially mild myopia and astigmatism, often requiring optical correction. Routine refraction screening is recommended for limiting preventable visual loss.