Unbiased estimation of refractive state of aberrated eyes.
Unbiased estimation of refractive state of aberrated eyes.
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DOI：
10.1016/j.visres.2011.07.006
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发表时间：
2011-09-01
期刊：
影响因子：
1.8
通讯作者：
Thibos, Larry
中科院分区：
文献类型：
--
作者：
Martin, Jesson;Vasudevan, Balamurali;Himebaugh, Nikole;Bradley, Arthur;Thibos, Larry
识别基于波前像差测量的无偏方法来估计最大化视觉敏锐度所需的目标聚焦度。实验的目的是将阻碍先前研究的混杂因素的影响降至最低。目的获得相同单色波长下的波前屈光度和主观视力屈光度。睫状肌麻痹消除了调节和瞳孔波动。使用计算机控制的强制选择阶梯程序，使用0.125个散焦屈光度步骤，进行无偏主观屈光，以最大化高对比度字母的视觉敏锐度。所有实验均采用两种不同的瞳孔直径(3 mm和6 mm)。正如文献报道的那样，主观性屈光不正不会随着瞳孔的扩大而明显改变。对于3 mm的瞳孔，大多数指标产生的客观屈光度比主观视力屈光度高0.1D左右。当瞳孔直径增加到6 mm时，这种偏差在近视方向上发生了变化，不同指标之间的变异性也增加了。与测量的精确度相比，这些误差很小，这意味着大多数测量标准为中等和较大的学生提供了对屈光状态的公正估计。可以使用各种图像质量度量来确定单色(635 Nm)光的眼睛屈光状态，从而在不需要经验校正系数的情况下获得准确的结果。
To identify unbiased methods for estimating the target vergence required to maximize visual acuity based on wavefront aberration measurements. Experiments were designed to minimize the impact of confounding factors that have hampered previous research. Objective wavefront refractions and subjective acuity refractions were obtained for the same monochromatic wavelength. Accommodation and pupil fluctuations were eliminated by cycloplegia. Unbiased subjective refractions that maximize visual acuity for high contrast letters were performed with a computer controlled forced choice staircase procedure, using 0.125 diopter steps of defocus. All experiments were performed for two pupil diameters (3mm and 6mm). As reported in the literature, subjective refractive error does not change appreciably when the pupil dilates. For 3 mm pupils most metrics yielded objective refractions that were about 0.1D more hyperopic than subjective acuity refractions. When pupil diameter increased to 6 mm, this bias changed in the myopic direction and the variability between metrics also increased. These inaccuracies were small compared to the precision of the measurements, which implies that most metrics provided unbiased estimates of refractive state for medium and large pupils. A variety of image quality metrics may be used to determine ocular refractive state for monochromatic (635nm) light, thereby achieving accurate results without the need for empirical correction factors.
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DOI：
10.1364/josaa.12.002329
发表时间：
1995-10-01
影响因子：
1.9
作者：
BURNS, SA;WU, S;ELSNER, AE
通讯作者：
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10.1364/josaa.20.001371
发表时间：
2003-07-01
影响因子：
1.9
作者：
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通讯作者：
Antona, B
影响因子：
3.8
作者：
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