Double-pass and interferometric measures of the optical quality of the eye.
Double-pass and interferometric measures of the optical quality of the eye.
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DOI：
10.1364/josaa.11.003123
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发表时间：
1994-12
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影响因子：
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通讯作者：
David R. Williams;David H. Brainard;Matthew J. McMahon;R. Navarro
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文献类型：
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作者：
David R. Williams;David H. Brainard;Matthew J. McMahon;R. Navarro
我们比较了用于测量人眼的调制传递函数（MTF）的两种方法：类似于坎贝尔和绿色[J. Physiol.（伦敦）181，576（1965）]的干涉法和类似于Santamaria等人[J. Opt. Soc. Am. A4，1109（1987）]。我们在这两种技术中实施了各种改进，以减少MTF估计中的误差。对于这两种方法，我们使用了相同的观察者、折射状态、瞳孔大小（3 mm）和波长（632.8 nm）。在双通方法中，我们发现观察者的主观最佳焦点平面与客观最佳焦点平面之间的密切一致性，这表明大部分反射光在其通过受体层的双通过程中被限制在单个锥体内。双通方法产生的MTF的类似，但略低于那些干涉方法。调制传递中的这种额外损失可能归因于从脉络膜反射的光，因为减少脉络膜对眼底反射的贡献的绿色光产生与干涉测量结果一致的稍微更高的MTF。当使用任一种方法时，MTF远低于用像差仪方法获得的MTF [Vision Res.28，659（1988）]。在干涉测量方法的基础上，提出了一种新的人眼单色调制传递函数的估计方法。
We compare two methods for measuring the modulation transfer function (MTF) of the human eye: an interferometric method similar to that of Campbell and Green [J. Physiol. (London) 181, 576 (1965)] and a double-pass procedure similar to that of Santamaria et al. [J. Opt. Soc. Am. A 4, 1109 (1987)]. We implemented various improvements in both techniques to reduce error in the estimates of the MTF. We used the same observers, refractive state, pupil size (3 mm), and wavelength (632.8 nm) for both methods. In the double-pass method we found close agreement between the plane of subjective best focus for the observer and the plane of objective best focus, suggesting that much of the reflected light is confined within individual cones throughout its double pass through the receptor layer. The double-pass method produced MTF's that were similar to but slightly lower than those of the interferometric method. This additional loss in modulation transfer is probably attributable to light reflected from the choroid, because green light, which reduces the contribution of the choroid to the fundus reflection, produces somewhat higher MTF's that are consistent with the interferometric results. When either method is used, the MTF's lie well below those obtained with the aberroscope method [Vision Res. 28, 659 (1988)]. On the basis of the interferometric method, we propose a new estimate of the monochromatic MTF of the eye.