Denieul P, Corno-Martin F
CNRS UPR 257, Laboratoire de Physique Appliquée du Muséum, Paris, France.
Ophthalmic Physiol Opt. 1994 Apr;14(2):184-92. doi: 10.1111/j.1475-1313.1994.tb00107.x.
The mean level and microfluctuations of accommodation were objectively recorded, in natural viewing conditions, by infrared optometry on steady presentation of various combinations of achromatic and coloured Snellen E on achromatic or coloured fields, with or without a luminance contrast. In addition to the absolute mean power spectrum of the microfluctuations, the HF/LF ratio of the high (HF, 0.5-6 Hz) and low (LF, 0-0.5 Hz) frequency activity of this phenomenon, which provides a sensitive objective description of the control, was analysed. In the case of maximum luminance contrast, for any monochrome situation, the HF/LF ratio decreases when changing from an achromatic-only contrast to a saturated coloured situation. At the same time, the relative shifts of the mean level of accommodation, which compensate ocular chromatism under coloured conditions, increase with colour saturation. In the case of an isoluminant chromatic contrast, the decrease in the HF/LF ratio was significant. This result confirms the inefficiency of chromatic contrast to control accommodation. Furthermore, this study confirms that both LF and HF absolute activity of the microfluctuations of accommodation are usually related to the stimulus characteristics. Their antagonistic behaviour is an argument for considering the HF/LF ratio.
在自然观察条件下，通过红外验光法，在无色或有色视场上稳定呈现各种无色和有色斯内伦E视标的不同组合（有无亮度对比度）时，客观记录调节的平均水平和微波动情况。除了微波动的绝对平均功率谱外，还分析了该现象的高频（HF，0.5 - 6 Hz）和低频（LF，0 - 0.5 Hz）活动的HF/LF比值，该比值能敏感地客观描述调节控制情况。在最大亮度对比度的情况下，对于任何单色情况，从仅无色对比度变为饱和色情况时，HF/LF比值会降低。同时，在有色条件下补偿眼内色差的调节平均水平的相对变化会随着颜色饱和度增加。在等亮度色差对比度的情况下，HF/LF比值的降低很显著。这一结果证实了色差对比度在控制调节方面的低效性。此外，本研究证实调节微波动的LF和HF绝对活动通常都与刺激特性有关。它们的拮抗行为是考虑HF/LF比值的一个依据。
