Lens & Cataract · NEET PG Preparation Ophthalmology
A 65-year-old male presents with complaints of gradually progressive painless diminution of vision in both eyes, worse in bright sunlight. On slit-la…
Practice question from Lens & Cataract (NEET PG Preparation Ophthalmology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-139B37
A 65-year-old male presents with complaints of gradually progressive painless diminution of vision in both eyes, worse in bright sunlight. On slit-lamp examination, there is yellow-brown coloration of the central lens nucleus with preservation of clear peripheral cortex, and a myopic shift in his refraction. What is the most likely diagnosis?
- A.Cortical cataract
- B.Nuclear sclerosisCorrect answer
- C.Posterior subcapsular cataract
- D.Anterior polar cataract
Solution
Nuclear sclerosis is characterized by hardening and yellow-brown discoloration of the lens nucleus. It causes a myopic shift (index myopia) due to an increase in the refractive index of the nucleus, and patients often notice better vision in dim light (when the pupil is dilated) compared to bright sunlight (when the pupil constricts).
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