Table 1.
Esodeviations | Exodeviations | |||
---|---|---|---|---|
Fusion potential | No fusion potential | Fusion potential | No fusion potential | |
Distanceb | 0 PD to 6 PD XT | 2 PD to 8 PD ET | 2 PD to 8 PD ET | 4 PD to 14 PD ET |
Nearc | 0 PD to12 PD XT | 4 PD XT to 8 PD ET | 10 PD XT to 8 PD ET | 4 PD XT to 14 PD ET |
ET, esotropia; PD, prism diopters; XT, exotropia.
Rare exceptions to target angles were made for patients with internuclear ophthalmoplegia, convergence insufficiency, and third nerve palsies, where the target angle was a greater ET (n = 7), when a patient had an atypical ET or XT drift after previous surgery (n = 4), and when appearance of the strabismus overrode measurements in nonfusing patients (n = 2).
Distance target ranges were observed when Krimsky measurements were used to optimize appearance for patients with abnormal angle kappa or when visual acuity precluded prism testing.,.
The distance target range was prioritized; the near target range became important in cases where the near XT exceeded the target range.