Aggarwala K R, Nowbotsing S, Kruger P B
Schnurmacher Institute for Vision Research, State University of New York State College of Optometry, New York 10010, USA.
Invest Ophthalmol Vis Sci. 1995 Dec;36(13):2695-705.
The objective of the current study was to compare accommodation to targets illuminated with monochromatic light from different regions of the visible spectrum with accommodation to white-light targets.
One of 10 marrow-band interference filters (430, 450, 470, 500, 530, 550, 570, 590, 630, and 670 nm) was used to produce monochromatic light from a tungsten-halogen source to illuminate a Maltese cross-target in Maxwellian view. Luminance of each monochromatic light was matched by minimum border photometry against a standard white light (3000 K) that was maintained at 200 cd/m2. Chromatic difference of focus of the eye was minimized for all monochromatic targets by the use of an achromatizing lens. A white-light target also was used, and the subject's eye was achromatized or the eye had normal chromatic aberration. The target was moved sinusoidally toward and away from the eye at a temporal frequency of 0.2 Hz over a 1 D amplitude (peak to peak). Accommodation was monitored continuously by an infrared recording optometer, and responses were Fourier analyzed to obtain gain and phase lag at the temporal frequency of stimulation.
Accommodative gain was highest and phase lag was smallest when the target was illuminated by white light in the presence of normal chromatic aberration. The achromatized white-light gain of accommodation was statistically similar to the gain for monochromatic targets, indicating that the presence of chromatic aberration facilitates accommodation. Significant intersubject variability was present in the accommodative tracking ability to monochromatic targets.
Accommodation to monochromatic targets is not as accurate as accommodation to a white-light target, and this effect is related to the presence of ocular longitudinal chromatic aberration for the white-light target.
本研究的目的是比较眼睛对来自可见光谱不同区域的单色光照射的目标的调节与对白光目标的调节。
使用10个骨髓带干涉滤光片（430、450、470、500、530、550、570、590、630和670纳米）中的一个，从钨卤素光源产生单色光，以麦克斯韦观察法照亮一个马耳他十字目标。通过最小边界光度法将每种单色光的亮度与保持在200 cd/m²的标准白光（3000 K）相匹配。通过使用消色差透镜，使所有单色目标的眼睛焦点色差最小化。还使用了一个白光目标，受试者的眼睛进行了消色差处理或眼睛具有正常色差。目标以0.2 Hz的时间频率在1 D振幅（峰到峰）上向眼睛和远离眼睛做正弦运动。通过红外记录验光仪连续监测调节情况，并对反应进行傅里叶分析，以获得刺激时间频率下的增益和相位滞后。
当目标在存在正常色差的情况下被白光照射时，调节增益最高，相位滞后最小。消色差白光的调节增益在统计学上与单色目标的增益相似，表明色差的存在有助于调节。在对单色目标的调节跟踪能力方面，受试者之间存在显著的个体差异。
对单色目标的调节不如对白光目标的调节准确，这种效应与白光目标存在眼纵向色差有关。
