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
In near vision what is the change? 
Select and explain. 
A. Power of lens decreases, B. Depth of focus increases, C. Lateral recti contraction, D. Zonular tension increases
B: Depth of focus increases
Answer: B: Depth of focus increases 
Explanation: Ans. b. Depth of focus increasesThe most common problems developed in adults between ages 41 to 60 may to seeing clearly at close distances, especially when reading and working on the computer.This normal change in the eyes focusing ability, called presbyopia.