Design and validation of an infrared Badal optometer for laser speckle.
Design and validation of an infrared Badal optometer for laser speckle.
复制标题
用于激光散斑的红外 Badal 验光计的设计和验证。
DOI：
10.1097/opx.0b013e3181852742
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Thibos,LarryN
中科院分区：
文献类型：
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作者：
Teel,DanielleFW;Copland,RJames;Jacobs,RobertJ;Wells,Thad;Neal,DanielR;Thibos,LarryN
目的：利用旋转圆盘和红外光产生的激光散斑原理，验证Badal视力计设计的红外波前像差仪。该仪器被设计为主观屈光不正的红外光由人类patients.Methods。验证采用了一个模型眼与已知的屈光不正确定与客观的红外波前像差仪。该模型眼用于在人工视网膜上产生散斑图案，该人工视网膜具有由辅助眼科镜片引入的受控屈光不正量。人类观察者执行观察人工视网膜上形成的散斑图案的心理物理任务（借助于对红外辐射敏感的摄像机）。通过用Badal视力计调节入射光的聚散度以使激光散斑的运动无效来进行屈光。该方法的验证进行了不同程度的球面屈光不正和各种配置的屈光不正模型eye.Results.主观测量的屈光不正的范围从-4D到+4D与旋转盘运动子午线上模型眼屈光度预测的屈光不正一致。结论：使用Badal视力计控制激光散斑是确定屈光不正的有效方法红外波长下的主观屈光不正。这样的仪器将是有用的比较客观的措施获得的人眼屈光不正与自动验光仪和波前像差仪，采用红外辐射。
Purpose.To validate the design of an infrared wavefront aberrometer with a Badal optometer employing the principle of laser speckle generated by a spinning disk and infrared light. The instrument was designed for subjective meridional refraction in infrared light by human patients.Methods.Validation employed a model eye with known refractive error determined with an objective infrared wavefront aberrometer. The model eye was used to produce a speckle pattern on an artificial retina with controlled amounts of ametropia introduced with auxiliary ophthalmic lenses. A human observer performed the psychophysical task of observing the speckle pattern (with the aid of a video camera sensitive to infrared radiation) formed on the artificial retina. Refraction was performed by adjusting the vergence of incident light with the Badal optometer to nullify the motion of laser speckle. Validation of the method was performed for different levels of spherical ametropia and for various configurations of an astigmatic model eye.Results.Subjective measurements of meridional refractive error over the range− 4D to+ 4D agreed with astigmatic refractive errors predicted by the power of the model eye in the meridian of motion of the spinning disk.Conclusions.Use of a Badal optometer to control laser speckle is a valid method for determining subjective refractive error at infrared wavelengths. Such an instrument will be useful for comparing objective measures of refractive error obtained for the human eye with autorefractors and wavefront aberrometers that employ infrared radiation.