Station four
(5 minutes allowed)
AC/A ratio (accommodative convergence/accommodation ratio) can be measured using either the gradient method or the heterophoria method.

A patient has a 12D esophoria with a -2.00D lenses R and L and 4D exophoria with +2.00D lenses R and L. 

a. Which method can be used to calculate the AC/A ratio?

b. What is the AC/A ratio in this patient?



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