The association between nonstrabismic anisometropia, amblyopia, and subnormal binocularity

摘要: Abstract Purpose To determine if thresholds exist for the development of amblyopia and subnormal binocularity with various types anisometropia to compare these existing guidelines treatment or observation anisometropia. Design The records all previously untreated patients evaluated isolated refractive error during a 42-month period were reviewed assess association between anisometropia, amblyopia, binocularity. Participants Three hundred sixty-one (361) 50 nonanisometropic control participants, examined over period, no history error, other ocular pathologic characteristics evaluated. Methods Uncorrected visual acuity in each eye, monofixation response, degree stereopsis recorded patient. Patients unequal uncorrected retested cycloplegic refraction. If was still abnormal, while wearing spectacles. Main outcome measures Degree type compared incidence severity Results Spherical myopic (SMA) more than 2 diopters (D) spherical hypermetropic (SHA) 1 D results significant increase decrease binocular function when ( P = 0.05). Increasing levels SMA SHA beyond result increased amblyopia. Cylindrical (CMA) cylindrical hyperopic (CHA) 1.5 Levels CMA CHA an Conclusions This study supports characterizes