Using the heterophoria method,
calculate the AC/A (accommodative convergence / accommodation) ratio using
the following values (assuming the patient is emmetropic):

Interpupillary distance
= 60 mm

Alternate cover test
at
the distance (6 metre) = 36 prism dioptres esophoria
at
near (33 cm)
= 30 prism dioptres esophoria
