连续闪烁抑制法测量的知觉性优势眼与立体视觉的关系

The relationship between stereopsis and ocular sensory dominance measured with continuous flicker suppression

目的通过定量测量双眼的相对知觉优势，探索精细立体视觉是否只能出现在双眼相对平衡者中。方法实验研究。共38名受检者参加了实验。对每个受检者通过连续闪烁抑制法来定量双眼的相对知觉优势，并计算相对知觉优势指数（ODI）。18名受检者双眼相对平衡（无明确优势眼，ODI绝对值〈2），20名受检者双眼相对不平衡（有明确优势眼，ODI绝对值≥2）。受检者的立体视觉通过随机点图形来评估，测量受检者能达到的最佳立体视力（Dmin）和达到最佳立体视力所需要的最短时间（Tmin）。利用独立样本t检验来测试双眼平衡组与不平衡组之间的差异，Pearson相关分析来量化Tmin、Dmin与优势眼程度的相关性。结果双眼相对平衡与不平衡受检者的Dmin分别为42．9″±23．5″和60．5″±50．4″，差异无统计学意义。但是，双眼平衡受检者所需达到最佳立体视力的最短时间为（148．8±69．1）ms，显著短于双眼不平衡组[（353．2±262．9）ms]（t=3．2，P〈0．01）。Tmin与眼优势程度呈正相关（r=-0．58，P〈0．01）。结论精细立体视觉也可以出现在双眼不平衡者中，但需要更长的反应时间。

Objective To investigate the need for two balanced eyes to achieve fine stereopsis. Methods Thirty-eight subjects participated in the study. For each subject, ocular dominance was quantified with a continuous flicker suppression method and an ocular dominance index （ODI） was computed. Eight subjects were classified as having balanced eyes [abs （ODI） 〈2] and 20 subjects were classified as having unbalanced eyes labs （ODI） ≥2]. Stereopsis was evaluated with random dots, and the optimal stereoacuity （Dmin） and time needed to achieve such stereoacuity （Tmin） were computed for each subject. Results Train in the subjects with balanced eyes was significantly shorter than that in the subjects with unbalanced eyes （148.8±69.1 ms vs. 353.2±262.9 ms, t=3.2, P〈0.01）. However, there was no difference in Dmin between the two groups （42.9＂±23.5＂ vs. 60.5＂±50.4＂, P〉0.05）. Tmin showed a significant positive correlation with ODI （r=0.58, P〈0.01）. Conclusion People with unbalanced eves can also achieve fine stereoacuity, given sufficient resoonse time.