Table 1.

Burian’s classification of intermittent exotropia

Type	Description
CI	Amount of deviation: Near > far (amount of difference between near and far measurement > 10 PD)
True DE	In both first measurement and 30 min after monocular patch, amount of deviation: Distance > near (amount of difference between far and near measurement >10 PD)
Pseudo DE	In first measurement, amount of deviation: Far > near After 30 min of monocular patch, amount of deviation: Near=far (or amount of difference between far and near measurement <10 PD)
Basic	Amount of deviation: Near=far (or amount of difference between far and near measurement <10 PD)

CI: Convergence insufficiency, PD: Prism diopter, DE: Divergence excess