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Solar retinopathy. A study from Nepal and from Germany.
1Kathmandu Lens Clinic, Nepal.
Documenta Ophthalmologica. Advances in Ophthalmology
|August 4, 1999
Summary
Solar retinopathy, caused by sun-gazing, affected 319 patients in Nepal. Most retained good vision, with few long-term visual disturbances or color vision issues, though some experienced central visual field defects.
Area of Science:
- Ophthalmology
- Retinal Diseases
- Public Health
Background:
- Solar retinopathy is an eye condition resulting from direct or indirect sun-gazing.
- It can cause visual impairment and characteristic retinal lesions.
- Understanding its prevalence and long-term effects is crucial for patient management.
Purpose of the Study:
- To investigate the clinical characteristics and visual outcomes of patients with solar retinopathy in Nepal.
- To assess the long-term visual acuity, color vision, and visual field defects in affected individuals.
- To explore the relationship between sun-gazing habits and the severity of solar retinopathy.
Main Methods:
- Retrospective analysis of 319 patients diagnosed with solar retinopathy over 20 months.
- Clinical examination including visual acuity, funduscopy, and assessment of sun-gazing history.
- Follow-up study of 29 patients after three years, including visual disturbances, color vision testing (Panel D 15, Ishihara), and metamorphopsia assessment.
- Detailed examination of five German patients using color contrast sensitivity (CCS) testing for central and peripheral visual fields.
Main Results:
- Over 80% of patients maintained visual acuity of 6/12 or better, with no deterioration over time.
- 40% reported sun-gazing during an eclipse; 10% were sun worshipers.
- Follow-up revealed few persistent visual disturbances; no significant color vision defects were noted with Panel D 15, though some tritan axis uncertainty with Ishihara charts was observed.
- Metamorphopsia occurred in 11 eyes; CCS testing showed elevated tritan axis sensitivity in the central visual field but normal in the peripheral field for German patients.
Conclusions:
- Solar retinopathy in Nepal is associated with generally good visual prognosis and minimal long-term visual impairment.
- While gross color vision may be preserved, subtle defects in the tritan axis and central visual field sensitivity can occur.
- Public health awareness regarding the risks of sun-gazing, especially during eclipses, remains important.