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. 2020 Jul 4;32(3):217–225. doi: 10.4103/JOCO.JOCO_81_20

Table 2.

Kushner’s classification of intermittent exotropia

Type Description
High AC/A ratio Amount of deviation: Distance > near AC/A ratio is high
Proximal convergence Amount of deviation: Distance > near even after 30-60 min of occlusion AC/A ratio is normal
Tenacious proximal fusion Amount of deviation: Distance > near at first measurement After 60 min monocular occlusion near measurement increases
Basic Amount of deviation: Near=far
Low AC/A ratio Amount of deviation: Near > distance AC/A ratio is low
Fusional CI Amount of deviation: Near > distance Fusional convergence amplitude is poor
Pseudo CI Amount of deviation: Near > distance But distance measurement increases with 60 min of monocular occlusion

AC/A: Accommodative convergence to accommodation ratio, CI: Convergence insufficiency