Fam Han-Bor, Lim Kooi-Ling
Eye Institute, Tan Tock Seng Hospital, Singapore.
J Refract Surg. 2004 Sep-Oct;20(5):S570-5. doi: 10.3928/1081-597X-20040901-30.
To determine the effect of individual Zernike wavefront aberrations on binocular summation and binocular visual acuity.
A 0.25-microm wavefront aberration of second, third and fourth order Zernike modes were introduced into a set of log minimum angle of resolution unit (logMAR) visual acuity charts convolved by CTView. Subjects were dilated and fitted with an artificial pupil of 3 mm. For each set of charts, right eye, left eye, and binocular acuity was measured. The gain in binocular visual acuity over monocular visual acuity was defined as binocular summation. The visual acuity lost binocularly reading aberrated charts was normalized for each subject and defined as the aberration induced loss in acuity.
Binocular summation was 10.0% (95% limits of agreement 8.8 to 11.1%) in the unaberrated state and ranged from 17.3 to 3.4% in the Zernike modes studied. Binocular summation was greatest in defocus followed by coma and astigmatism. The aberration induced loss in monocular and binocular acuity was higher for Zernike modes with low angular frequency compared to those with high angular frequency. Linear regression showed a significant relationship between aberration-induced loss of visual acuity and binocular summation.
A fixed amount of root mean square (RMS) aberration has a varied effect on binocular vision depending on the angular frequency and radial order of Zernike mode. Binocular vision has a positive effect in reducing the visual impact of aberrations as Zernike modes that suffer from the most loss of visual acuity also experience the greatest amounts of binocular summation.
确定单个泽尼克波前像差对双眼总和及双眼视力的影响。
将二阶、三阶和四阶泽尼克模式的0.25微米波前像差引入由CTView卷积的一组对数最小分辨角单位（logMAR）视力表中。受试者散瞳后佩戴3毫米的人工瞳孔。测量每组视力表的右眼、左眼及双眼视力。双眼视力相对于单眼视力的增益定义为双眼总和。将双眼阅读像差视力表时损失的视力针对每个受试者进行归一化，并定义为像差引起的视力损失。
在无像差状态下，双眼总和为10.0%（95%一致性界限为8.8%至11.1%），在所研究的泽尼克模式中，其范围为17.3%至3.4%。双眼总和在离焦时最大，其次是彗差和散光。与高角频率的泽尼克模式相比，低角频率的泽尼克模式引起的单眼和双眼视力损失更高。线性回归显示像差引起的视力损失与双眼总和之间存在显著关系。
固定量的均方根（RMS）像差对双眼视觉的影响因泽尼克模式的角频率和径向阶数而异。双眼视觉在减少像差的视觉影响方面具有积极作用，因为视力损失最大的泽尼克模式也经历了最大量的双眼总和。
