Related Experiment Video
Updated: Jun 11, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment
Published on: March 24, 2020
Eye and vision defects in under-five-year-old children in Oman: A public health intervention study
Rajiv Khandekar1, Saleh Al Harby, Ali Jaffer Mohammed
1Eye and Ear Health Care, Direcotrate of Health Services, Ministry of Health, Oman.
Insights
Early eye screening for children under five in Oman identified significant vision defects. Targeted screening for 3-4 year olds for vision and 1-2 year olds for ocular issues is recommended over universal approaches.
Area of Science:
- Ophthalmology
- Public Health
- Pediatrics
Background:
- Early detection of vision and ocular defects in children is crucial for timely intervention.
- Existing health services in Oman may not identify all children with eye problems.
- A public health intervention was conducted to assess the prevalence of visual impairments in young children.
Purpose of the Study:
- To identify children under five years old with vision or ocular defects in two Omani provinces.
- To evaluate the effectiveness of screening methods for early detection of eye conditions in young children.
Main Methods:
- A public health intervention study involving ocular examinations of 1,520 children under five.
- Examinations included assessing eyeball size, strabismus, nystagmus, and pupil appearance.
- Visual acuity was tested using LOGMAR charts and preferential viewing tests appropriate for different age groups.
Main Results:
- Strabismus was detected in 2.9% and nystagmus in 1.2% of children.
- Vision screening identified significant numbers of children with defective vision, with some cases missed by existing services.
- Screening specific age groups (1-2 years for ocular, 3-4 years for vision) proved effective in predicting eye problems.
Conclusions:
- Eye and vision screening effectively detects eye problems in under-five children at early stages.
- Targeted screening of high-risk populations or specific age groups is more efficient than universal screening.
- The study highlights the importance of systematic screening programs to complement existing healthcare services for pediatric eye health.
Purpose:
To identify under-five-year-old children with vision or ocular defect in two provinces (Wilayats) of central Oman in 2006.
Study Design:
Public health intervention study.
Materials And Methods:
Ocular examination in Manah Wilayat was conducted by nursing staff of the primary health center (PHC) and in Mudhaiby Wilayat was conducted by a trainee Omani optometrist. Abnormal sized eyeball, strabismus, nystagmus and white pupil were recorded. Visual acuity was tested by LOGMAR chart with Lea's symbols in children >2 years of age and preferential viewing was assessed by Lea's grating paddle or 'Hiding Heidi' picture in children =2 years age. Data was analyzed using Statistical Package for Social Studies (SPSS 12).
Result:
Among 1,520 examined children, three children had absent eyeball bilaterally and three had unilaterally absent eyeball. Strabismus and nystagmus were detected in 44 (2.9%) and 18 (1.2%) children respectively. 'Hiding Heidi' test was normal in 530/537 (87%) of children. Distant vision reading was >/=0.32 in 386/448 (86.2%) eyes. Preferential looking test suggested that half of the children had defective vision (>2cpcm). Screening at '1-2 year' and '3-4 years' age group could significantly predict eye problems (P = 0.001).
Conclusion:
Eye and vision screening of under-five kids helped in detection of eye problems in early stages. Instead of universal screening, high risk population or children of '3 to 4' years for vision and '1 to 2' years for ocular abnormalities is proposed The existing health services could not detect some children with eye problems and they were identified during such screening.
Related Concept Videos
Accessory Structures of the Eye
Photoreceptors and Visual Pathways
Glaucoma: Overview
Open Angle Glaucoma: Treatment
Drugs such as carbonic anhydrase inhibitors, α2- and...
Angle Closure Glaucoma: Treatment
Diabetic Retinopathy
