双眼平衡者立体感建立更快，但更粗糙。

Balanced Eyes See Stereopsis More Quickly, but Not More Finely.

机构信息

Aier School of Ophthalmology, Central South University, Changsha, China.

Aier Institute of Optometry and Vision Science, Changsha, China.

出版信息

Invest Ophthalmol Vis Sci. 2018 Jan 1;59(1):499-504. doi: 10.1167/iovs.17-22849.

DOI:10.1167/iovs.17-22849

PMID:29368004

Abstract

PURPOSE

To quantify ocular sensory dominance and investigate its relationship to stereopsis.

METHOD

A total of 69 subjects participated in the study. Ocular dominance was measured by a continuous flashing technique, with the tested eye viewing a Gabor patch increasing in contrast, and the fellow eye viewing a Mondrian noise decreasing in contrast. In each trial, the log ratio of Mondrian to Gabor's contrasts was recorded as a subject first detected the Gabor. We collected 50 trials for each eye and an interocular difference was analyzed with a rank-sum test. The z-value was used as the ocular dominance index (ODI) to quantify the degree of ocular dominance. A subject with ODI ≥ 2 was categorized as having a clear ocular dominance, and a subject with ODI < 2 was considered as having balanced eyes (unclear dominance). The stereoacuity was measured with random dot patterns with durations varying from 50 to 1000 ms. The best achievable stereoacuity (Dmin) and the integration time needed to acquire that (Tmin) were calculated.

RESULTS

A total of 30 subjects had balanced eyes and 39 had clear ocular dominance. Tmin was significantly longer in subjects with clear ocular dominance than in subjects with balanced eyes (180.18 vs. 121.17 ms, P < 0.01). Tmin was positively correlated with ODI (P < 0.01). However, Dmin in subjects with clear dominance was not different from that in subjects with balanced eyes (40.60 vs. 35.73 arcsec, P = 0.18).

CONCLUSIONS

Ocular dominance is not associated with how fine the stereoacuity is, but rather how quickly the best stereoacuity is acquired.

摘要

目的

定量评估眼优势，并研究其与立体视的关系。

方法

共有 69 名受试者参与了这项研究。使用连续闪烁技术测量眼优势，测试眼观察对比度增加的 Gabor 斑，对侧眼观察对比度降低的蒙德里安噪声。在每次试验中，记录蒙德里安与 Gabor 对比度之比的对数作为受试者首次检测到 Gabor 的结果。我们为每只眼收集 50 次试验，并通过秩和检验分析眼间差异。使用 z 值作为眼优势指数（ODI）来定量评估眼优势的程度。ODI≥2 的受试者被归类为具有明显的眼优势，ODI<2 的受试者被认为是双眼平衡（无明显优势）。使用随机点模式测量立体视锐度，持续时间从 50 到 1000 毫秒不等。计算最佳可实现的立体视锐度（Dmin）和获得该锐度所需的时间（Tmin）。

结果

共有 30 名受试者双眼平衡，39 名受试者具有明显的眼优势。具有明显眼优势的受试者的 Tmin 明显长于双眼平衡的受试者（180.18 与 121.17 毫秒，P<0.01）。Tmin 与 ODI 呈正相关（P<0.01）。然而，具有明显优势的受试者的 Dmin 与双眼平衡的受试者没有差异（40.60 与 35.73 弧秒，P=0.18）。