AIM:To investigate the effect of the severity of monocular visual field loss on binocular visual field loss patients with primary angle-closure glaucoma, primary open angle glaucoma and normal tension glaucoma.

METHODS: According to the stage of binocular monocular field loss, 30 healthy and 120 glaucoma patients participants were classified as normal, early, moderate or severe. Binocular vision was determined by integrating the field of view and Esterman binocular field assessment. The monocular and binocular visual field parameters were compared within and between groups.

RESULTS:For patients with one eye at normal or early stage and the other with severe stage, the mean deviation of binocular comprehensive visual field was -2.8±1.1dB and -5.5±1.9dB, respectively, and Esterman's average score were 99.1%±1.7% and 95.6%±4.7%, respectively. When both eyes developed moderate or severe injury(moderate/moderate, moderate/severe or severe/severe), the mean deviation of binocular comprehensive visual field is lower than -6dB, and the Esterman average score of moderate/moderate group and moderate/severe group was 94.2%±6.0% and 94.3%±4.9%, respectively. However, when both eyes in the stage of severe injury, the average score of Esterman's rapidly decreased from more than 90% to 68.4%±26.3%.

CONCLUSION: If one eye is in a normal or early stage, the binocular vision can remain relatively intact. When the binocular progression to the moderate or severe stage, the mean deviation of binocular visual field defects measured by the binocular comprehensive visual field is significant, and only when the binocular progression to the severe stage, significant Esterman binocular visual field defects are detected.