This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Stenopic slit'is used for all except- 
Select and explain. 
A. Fincham's test, B. Determine the axis of cylinder, C. Corneal tattooing, D. lridectomy
C: Corneal tattooing
Answer: C: Corneal tattooing 
Explanation: Ans: C. Corneal tattooingRef: A, K. Khurana Comprehensive Ophthalmologt,4,h ed.Stenopic slit is useful in finding out the axis of the cylinder.(option b) stenopic slit is used in cases of corneal opacities to find out the optimal site for optical iridectomy.After dilating the pupil with a mydriatic, the slit is rotated in front of the eye and the axis which gives maximum clarity is chosen for optical iridectomy