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?