Main Organiser

Julius Centre University of Malaya

Co-organiser

Department of Social and Preventive Medicine, Faculty of Medicine, University of Malay

Supported by

University of Malaya

THE ROLE OF SUN LIGHT EXPOSURE AS EVIDENCE BASED AND OTHER RISK FACTORS OF EPIDEMIOLOGY OF SENILE CATARACT

Author

Khadega Salem

Institution

Public Health and Preventive Medicine Department, Research Institute Of Ophthalmology, Egypt

Abstract

Introduction: Many studies all over the world have been conducted to find out the epidemiologic Features of senile cataract. Solar radiation stands on the top of the accused factors.

Objectives: Study objectives to assess the average sun light exposure and its association with senile cataract as evidence based and to assess the effects of personal and environmental factors of this disease in Egypt.

Methods: Subjects and methods an epidemiologic case- control study was designed and conducted to find out these factors among Egyptian patients. The study included 390 cases and 415 controls who were age and sex matched. A questionnaire was designed and filled for each subject in the study. It included personal history, residential history, and family history of cataract, history of systemic diseases, history of eye trauma as well as exposure to chemicals, history of smoking, drug intake and wearing of sunglasses. Blood pressure, height, hand grip strength and complete ophthalmological examination. Mean total solar radiation values were calculated from results obtained from Egyptian metrological authority and other data for every subject.

Results: Results of the studied group yielded a statistically significant association with: Marital status as widows represented about 30% of cases and 17.6% of controls. The difference was statistically significant {P<0.001}. Level of education as illiterates and those who read and write was 71.29% of cases compared to 54.40% among control. As regards level of education, the difference between both groups was significant {P<0.001}. This may be due to more exposure to sunlight as most of them are outdoor workers. Type of occupation, where unskilled laborers constituted 49.5% of cases and 17.6% of controls. The difference was significant {P < 0.001}. Smoking habit as well as history of mild trauma showed a significant result at {P<0.05} for each. Family history of cataract represented 66.4% among cases and 19.76% among controls. The difference was significant {P<0.001}. As regards height, systolic blood pressure, diastolic blood pressure, there was a significant difference between cases and controls {P < 0.001} for each. Mean individual’s average annual sun exposure was 8.3± 5.2 Mega Joules / M2 / year among cases and 5.2± 2.9 Mega Joules / M2 / year among controls . The difference was significant [p<0.001] On the other hand, drug intake, alcohol consumption, exposure to non- cataractogenic chemicals, wearing of sunglasses and iris color showed no significant difference between cases and controls. Results of the study also, showed that the commonest variety of cataract encountered in this study was the cortical and nuclear type -occurring together -[43.6 %] followed by the nuclear type only [24.6%]

Conclusion: Ultraviolet radiation has a significant role in the occurrence of senile cataract as evidence based.