Question

Joel needs new glasses. He is getting older, and he feels his eyes getting tired when he tries to read a book up close. He knows that his eye muscles are straining in order to a. contract or dilate to control the pupil size. b. change the shape of the cornea to focus light. c. increase the concentration of cones in the retina. d. fine-tune how the lens bends light.

Answer 1

I think the answer is letter d. fine-tune how the lens bends light. Eye strain often happens when a person focuses his vision on a particular object.  When Joel is reading, the glasses helps fine-tune the light before going into the retina. If Joel does not change his glasses, it would make his eyes focus more on the book, causing the eyes to strain even more