A patient complains of inability in reading a newspaper, paicularly in bright sunlight. What is the most likely diagnosis?
While reading newspaper in bright sunlight there occurs accommodation and thus miosis, allowing only central rays of light to pass through. However posterior subcapsular cataract make it difficult for light rays to pass Nuclear cataract or nuclear sclerosis causes index myopia and thus difficulty in far vision like driving a car but it improves near vision - hence the 2nd vision phenomenon. In the question, vision for near is expected for reading a newspaper which would be good in a patient with nuclear cataract Coical cataract cause problem in night vision as pupil dilate at night exposing the cataractous lens and rays of light are not able to pass through peripheral pa of lens. Coronary cataract is an extremely common form of developmental cataract occurring about pubey; thus involving either the adolescent nucleus or deeper layer of the coex. Since, the opacities are situated peripherally, vision is usually unaffected. Sometimes the associated large punctace opacities may marginally reduce the vision.
Nuclear cataract
Coical cataract
Posterior sub capsular cataract
Coronary Cataract
Lenses