Binocular vision after lens implantation.
Orthoptic tests for binocular vision were performed on 107 patients with intraocular lenses 3 to 10 months after surgery. The tests carried out were: cover test, Worth-test, Lang's two-pencil-test, the TNO-test and Lang's stereo-test. The implanted lenses were of the four-loop Binkhorst type. They were all implanted after planned extracapsular surgery. Visual acuity 3 to 10 months after operation was 0.5 or more in 95% of the patients (0.8 or more in 53% of the patients). Refraction in spheric equivalents was -0.7 +/- 1.26 diopters. The calculated optical aniseikonia was 2.2% +/- 1.8%. Orthotropia as disclosed by the unilateral cover-test prevailed in 81% of the patients. Most of the patients were exotrop (14 patients for the near, 6 patients for the near and the far). The results of Lang's two-pencil-test were positive in 89%. The Worth-test (polarized, for distance) showed suppression in 23% of the patients. The random-dot-test (TNO-test) showed positive results in 68% (retinal disparities 1980 arc seconds or less), in 57% (480 arc seconds or less), and the new Lang stereotest in 58% (1200 arc seconds or less) of the patients.
D004172:Diplopia / Q000209:etiology*; D006801:Humans; D007910:Lenses, Intraocular / Q000009:adverse effects*; D014787:Vision Tests; D014792:Visual Acuity