Gräf M, Dettmar T, Kaufmann H
Universitäts-Augenklinik für Schielbehandlung und Neuroophthalmologie, Giessen.
Ophthalmologe. 1996 Aug;93(4):396-403.
The purpose of this study was to optimize a new nystagmographical method of objective assessment of visual acuity and compare it to an electrophysiological method.
In the nystagmographical method motionless brake marks were superimposed on a moving grating pattern, causing suppression of optokinetic nystagmus (OKN). The smallest brake mark that interrupted the OKN was taken as an objective measure for visual acuity (VA). In the electrophysiological method rapid sequences of high-contrast checkerboard patterns of different spatial frequency were presented in a pattern on-off mode in a foveal field. The VEP response function was extrapolated to 0 microV. The objective values of 94 healthy eyes with artificially reduced vision (VA 0.05-2.0) and 314 eyes with pathological reduction of VA due to different etiologies were compared. RESULTS. The selectivity of the nystagmographical method could be improved. With the exception of strabismic amblyopia, the results were closely correlated with the VA. The least VA could be estimated in steps of 0.06, 0.1, 0.2, 0.5 and 0.8.
The new nystagmographical method yields useful information about the least VA if strabismic amblyopia is excluded.
本研究的目的是优化一种用于客观评估视力的新眼震图方法，并将其与一种电生理方法进行比较。
在眼震图方法中，将静止的制动标记叠加在移动的光栅图案上，从而抑制视动性眼震（OKN）。中断OKN的最小制动标记被用作视力（VA）的客观测量指标。在电生理方法中，以模式开-关模式在中央凹视野中呈现不同空间频率的高对比度棋盘格图案的快速序列。将视觉诱发电位（VEP）反应函数外推至0微伏。比较了94只视力人为降低（VA 0.05 - 2.0）的健康眼睛和314只因不同病因导致VA病理性降低的眼睛的客观值。结果。眼震图方法的选择性可以得到改善。除了斜视性弱视外，结果与VA密切相关。最小视力可以以0.06、0.1、0.2、0.5和0.8的步长进行估计。
如果排除斜视性弱视，新的眼震图方法可提供有关最小视力的有用信息。
