###Rationale: In Unilocular diplopia an object appears double from the affected eye even when the normal eye is closed. CAUSES Subluxated clear lens. Subluxated intraocular lens. Keratoconus (irregular refraction from corneal surface) Double pupil (congenital / large iridectomy / iridodialysis) Incipient cataract (this usually causes polyopia - due to irregular refraction due to multiple water clefts within the lens) Ref;A.K.Khurana; 6th edition; Page no:344

###Answer: OPTION B IS CORRECT.
###Question: Commonest cause of uniocular diplopia
###Options:
A. Cataract
B. Subluxated lens
C. Third nerve palsy
D. Astigmatism
