This paper gives overview of development of system to detect & grade the cataract based on image processing.Cataract is when lens gets cloudy. It is leading cause of blindness worldwide. It causes a blurred and foggy vision. Catarct can lead to partial or complete loss of eyesight. A protein layer is developed gradually and the lens becomes cloudy over a long period of time which reduces vision and leads to blindness. Early treatment can lessen the difficulties faced by cataract. Early stage of cataract is not detected by manual method then it will cause problem. Accurate diagnosis and timely treatment of nuclear cataract is essential to prevent vision loss. Severity of cataract is given by grading system. Cataract is classified into three types based on the area of protein deposition named as nuclear cataract, cortical cataract, posterior sub capsular cataract. With the development of image processing techniques, efforts have been put in the development of automatic systems to improve grading objectivity.
Slit lamp, pupil, grading system, LOCSIII
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