This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Errors of Refraction, Subject name: Ophthalmology
All occur in process of accommodation of eye except 
Select and explain. 
A. Contraction of sphincter pupillae, B. Dilatation of pupil, C. Change in lens curvature, D. Contraction of ciliary muscles
B: Dilatation of pupil
Answer: B: Dilatation of pupil 
Explanation: Ans. b (Dilatation of pupil). (Ref. Parson, Diseases of Eye, 18th/pg.49, Basak, 2nd /68)ACCOMMODATION is ability to see near objects clearly, by increasing converging power of eye.Its components include:1. Constriction of ciliary muscles and sphincter pupillae2. Constriction of pupil3. Change in lens curvature (anterior surface)