This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Fincham test is used to diagnose 
Select and explain. 
A. Open angle glaucoma, B. Cataract, C. Mucopurulent conjunctivitis, D. Acute angle closure glaucoma
B: Cataract
Answer: B: Cataract 
Explanation: Ans. (b) CataractRef: Khurana 4/e, p. 146If the halos break it is due to cataract and if not it is due to angle closure glaucoma.Thus, the test is positive in diagnosing cataract. Glaucoma is not being diagnosed by this test. It is a diagnosis by exclusion.