a. Calculate the AC/A ratio (accommodative convergence / accommodation ratio) using the gradient method
and the following values (taken from an emmetropic patient): Alternating cover test

for distance (6 metre)
= 10 dioptre esophoria for distance with -3.00DS = 25 dioptre esophoria

b. A 6 year-old boy with 25 prism dioptres esotropia has a + 4.00 DS cycloplegic refraction. He has a AC/A
ratio of 6. What is the result of prescribing hypermetropic
glasses?