<prompt> Fincham test is used for -Differentiating open angle from angle closure glaucomaDifferentiate halos due to angle closure glaucoma and immature cataractClassify glaucomatous optic atrophyDifferentate granulomatous and non granulomatous uveitis  <response>: Ans. is b i.e. Differentiate halos due to angle closure glaucoma and immature cataract Finchamstesto Finchams test is used to differentiate the halos of PACG and immature cataract. In this a stenopaeic slit is passed across the pupil - Glaucomatous halo remains intact, while a halo due to cataract is broken up into segments. 