Study on translucent cover of frosted glass eye-shade in monocular visual measurement

Objective To explore the clinical value of frosted glass eye-shade in monocular visual acuity measurement by comparison of binocular and monocular visual acuity under various cover condition in light. Methods A total of 247 people came for physical examination were made distance visual acuity measurement by three ways: one eye was covered by a fiosted glass plate, opaque eye-shade, and no cover as well respectively, then was compared with each other. Pupil diameter was also measured in the states, and it's relation to visual acuity was discussed. Results The monocular visual acuity under opaque eye-shade was lower then the other two. Comparing the monocular visual acuity under frosted glass eye-shade with binocular visual acuity, there was no remarkable meaning in the difference (q=2.05, P ＞0.05). Activity of pupil was in relation to the difference of visual acuity under various conditions. Conclusions Monocular visual acuity under frosted glass eye-shade is more real and steady, and is more close to binocular visual acuity. Key words: Monocular visual acuity;  Binocular summation;  Optometry;  Monocular visual measurement under translucent cover; , Pupil diameter