Refractive errors, visual impairment, and the use of low-vision devices in albinism in Malawi.

BACKGROUND: This study focuses on the refractive implications of albinism in Malawi, which is mostly associated with the burden of visual impairment. The main goal was to describe the refractive errors and to analyze whether patients with albinism in Malawi, Sub-Saharan Africa, benefit from refraction. METHODS: Age, sex, refractive data, uncorrected and best-corrected visual acuity (UCVA, BCVA), colour vision, contrast sensitivity, and the prescription of sunglasses and low vision devices were collected for a group of 120 albino individuals with oculocutaneous albinism (OCA). Refractive errors were evaluated objectively and subjectively by retinoscopy, and followed by cycloplegic refraction to reconfirm the results. Best-corrected visual acuity (BCVA) was also assessed binocularly. RESULTS: One hundred and twenty albino subjects were examined, ranging in age from 4 to 25 years (median 12 years), 71 (59 %) boys and 49 (41 %) girls. All exhibited horizontal pendular nystagmus. Mean visual acuity improved from 0.98 (0.33) logMAR to 0.77 (0.15) logMAR after refraction (p < 0.001). The best improvement of VA was achieved in patients with mild to moderate myopia. Patients with albinism who were hyperopic more than +1.5 D hardly improved from refraction. With the rule (WTR) astigmatism was more present (37.5 %) than against the rule (ATR) astigmatism (3.8 %). Patients with astigmatism less than 1.5 D improved in 15/32 of cases (47 %) by 2 lines or more. Patients with astigmatism equal to or more than 1.5 D in any axis improved in 26/54 of cases (48 %) by 2 lines or more. CONCLUSIONS: Refraction improves visual acuity of children with oculocutaneous albinism in a Sub-Saharan African population in Malawi. The mean improvement was 2 logMAR units.

High prevalence in Malawi of sight-threatening retinopathy and visual impairment caused by diabetes: identification of population-specific targets for intervention.

AIMS: To report the prevalence of all grades of diabetic retinopathy and associations with demographic, clinical and biochemical variables in people with diabetes in Southern Malawi. METHODS: We report baseline data from a 24-month prospective cohort study. Subjects were systematically sampled from two hospital-based, primary care diabetes clinics. Visual acuity, glycaemic control, systolic blood pressure, HIV status, urine albumin-creatinine ratio, and haemoglobin and serum lipid levels were assessed. Retinopathy was graded at an accredited reading centre using modified Wisconsin grading of four-field mydriatic photographs. RESULTS: A total of 357 subjects were studied. Of these, 13.4% subjects were HIV-positive and 15.1% had anaemia. The overall prevalence rates of any retinopathy, sight-threatening diabetic retinopathy and proliferative retinopathy were 50.1% (95% CI 44.9-55.3), 29.4% (95% CI 24.7-34.1) and 7.3% (95% CI 4.6-10.0), respectively. In multivariate logistic analysis the presence of sight-threatening retinopathy was associated with duration of diabetes (odds ratio 1.11, 95% CI 1.05-1.17), HbA1c (odds ratio 1.31, 95% CI 1.13-1.50), systolic blood pressure (odds ratio 1.03, 95% CI 1.01-1.04), haemoglobin (odds ratio 0.98, 95% CI 0.96-0.99) and LDL cholesterol (odds ratio 1.63, 95% CI 1.18-2.25). No significant association with HIV status was observed. In all, 3.6 and 1.4% of people in our study cohort had visual acuity worse than 6/18 and 6/60 in the better eye, respectively. CONCLUSIONS: The present study found a prevalence of sight-threatening retinopathy in diabetes clinics in one Sub-Saharan African country of approximately four times that reported in recent European studies and a prevalence of proliferative retinopathy approximately 10 times higher. The association of sight-threatening retinopathy with lower haemoglobin level is a new finding. Our results highlight the urgent need for provision of services for retinopathy detection and management to avoid a large burden of vision loss.

Inappropriate enrollment of children in schools for the visually impaired in east Africa.

BACKGROUND: Many visually impaired children can learn to read print with appropriate training and simple visual aids. This may allow them to attend normal schools and to be integrated into society, which has lifelong benefits. Yet, in Africa, many visually impaired children are enrolled in special schools and taught only Braille. The purpose of this analysis was to document the extent of inappropriate enrollment of visually impaired children in special schools and annexes for the blind in four African countries. METHODS: Schools were selected through a population-proportional-to-size method so that they would represent all children attending special schools in Kenya, Malawi, Tanzania and Uganda. Children were examined by ophthalmologists trained in standardised methods to determine visual acuity and the cause of decreased acuity. RESULTS: Of 1062 children examined in special schools and annexes for the blind, 361 (34%, 95% CI 31.2, 36.8) had visual acuity >or=6/60; the most common cause of visual impairment was retinal disease. Of the 120 children with normal vision (>or=6/18), 69 (57.5%) had two normal eyes, 21 (17.5%) had an obvious ocular disfigurement in the fellow eye and 10 (8.4%) had had successful cataract surgery. CONCLUSIONS: In these countries, many children are placed inappropriately in special schools and annexes for the blind. The reasons are multiple and to rectify the situation will require advocacy and cooperation between ministries of health and education.

[Pediatric cataract surgery in Malawi]. / Chirurgie der kindlichen Katarakt in Malawi.

PURPOSE: The aim of this study was to evaluate the postoperative refractive status after pediatric cataract surgery with age-determined intraocular lens (IOL) implantation in children (age 0-8 years) in Malawi. MATERIALS AND METHODS: Hospital-based retrospective study from January to June 2011 analyzing age, sex, origin, type of cataract surgery, IOL power and postoperative refractive status. In the absence of biometry, IOL powers were chosen according to the child's age and IOL availability. RESULTS: A total of 58 eyes from 33 children were surgically treated of which 25 (76%) were bilateral and 8 (24%) unilateral. Best refractive outcome was achieved with a 25 diopter (D) IOL implanted in children 5-8 years old. None of the children aged 1-7 years achieved the previously calculated target refraction. Results showed a marked myopic variability. The range of postoperative refraction was from - 15 D to + 12.5 D and a large number of children (n=11, 33%) did not attend for follow-up. CONCLUSION: Implanting IOLs according to age groups is not a suitable surgical strategy even in resource-poor settings. Refractive outcomes were too variable with a marked myopic shift. Biometry and keratometry are required in order to undertake pediatric cataract surgery. Developing regional pediatric centres should be a focus of the VISION 2020 initiative.

[Retinoblastoma in Malawi: why are admissions too late?]. / Retinoblastom in Malawi : Warum zu späte Einweisung?

BACKGROUND: A total of 82 % of stationary admissions with the diagnosis of retinoblastoma (2009-2011) to the tertiary ophthalmology unit in Blantyre, Malawi (n = 58) presented with advanced stage disease. PATIENTS AND METHODS: In another study in 2012 we sought to identify why children mostly presented in advanced stages of disease and whether the delay was unique to children with cancer. In-depth interviews (IDI) were conducted at the hospital with 40 parents or guardians of children with retinoblastoma, congenital cataract, congenital glaucoma and corneal perforation (10 each). RESULTS: Most delays and delayed admissions occurred at the family (27.5 %, 11 out of 40) and primary health centre levels (30.0 %, 12 out of 40). Lack of money for transport caused delays (15.0 %, 6 out of 40) at all care levels. In contrast, children with painful conditions presented to a health facility within 24 h of onset without any complaints about lack of money for transport. CONCLUSION: Education about retinoblastoma and other non-painful eye diseases could be improved by a poster campaign to both parents and professionals at all medical healthcare levels. Transport for such cases between the various healthcare centers should be provided free of charge. There is room for improvement in initial diagnosis, referral and management within the healthcare service in the tertiary sector.

Presentation of Primary Open Angle Glaucoma (POAG) at Lions Sight First Eye Hospital in Blantyre, Malawi.

OBJECTIVE: Primary open angle glaucoma (POAG) is the most common type of glaucoma in Africa. We carried out a study to determine the clinical presentation pattern of patients with primary open angle glaucoma (POAG) at a tertiary hospital in Malawi. DESIGN: A cross-sectional study. SETTING: Lions Sight First Eye Hospital-a major referral and teaching state eye hospital in Blantyre, Malawi. SUBJECTS: Study participants were newly diagnosed POAG patients at specialist eye clinic during study period. RESULTS: A total of 60 POAG patients were recruited into the study. The mean age was 58.7 years (SD= 16.6, range 18 - 86). There were more male (44, 73.3%) than female (16, 27.7%) patients. The majority of patients (73%) presented one year after onset of visual symptoms. Twenty-six patients (43%) had unilateral blindness (visual acuity < 3/60; WHO classification), while nine patients (15%) presented with bilateral blindness. A vertical cup-to-disc ratio (CDR) of 0.8 or worse was seen in 92 eyes (79%). The mean intraocular pressure (IOP) reading was 35.5 mmHg (SD 13.30). Of the thirty-three eyes that successfully underwent visual field analysis, very advanced defects were recorded in 12 eyes (36%). CONCLUSION: This study demonstrates delayed presentation and male predominance among POAG patients at a tertiary eye hospital in Malawi. Glaucoma intervention programmes should aim at identifying patients with treatable glaucoma with particular attention to women.

Teaching corner: Regional anaesthesia for ophthalmic surgery.

Performing safe and effective regional anaesthesia for ophthalmic surgery is an important skill for anaesthetic and ophthalmologic practitioners. Akinetic sharp-needle blocks are generally safe but rare, sight and life threatening complications occur. Sub-Tenon's block using a blunt canula provides akinesa and is a safer alternative but serious complications have been reported. This review provides an introduction to the relevant anatomy, local anaesthetic drugs and commonly used techniques and a practical guide to their safe performance.

Teaching Corner: Regional Anaesthesia for Ophthalmic Surgery

Performing safe and effective regional anaesthesia for ophthalmic surgery is an important skill for anaesthetic and ophthalmologic practitioners. Akinetic sharp-needle blocks are generally safe but rare; sight and life threatening complications occur. Sub-Tenon's block using a blunt canula provides akinesa and is a safer alternative but serious complications have been reported. This review provides an introduction to the relevant anatomy; local anaesthetic drugs and commonly used techniques and a practical guide to their safe performance