Toshida K, Okuyama F, Tokoro T
Department of Ophthalmology, Tokyo Medical and Dental University School of Medicine, Japan.
Optom Vis Sci. 1998 Mar;75(3):221-6. doi: 10.1097/00006324-199803000-00028.
The effects of the accommodative stimulus and age on the accommodative microfluctuations were investigated in human subjects. Accommodative responses were measured by using an infrared (IR) optometer, and accommodative microfluctuations were quantified by power spectrum analysis. Two frequency bands were determined: low frequency components (< 0.5 Hz, LFC) and high frequency components (1.3 to 2.2 Hz, HFC). Among younger subjects, the changes in the HFC in response to the accommodative stimuli differed between subjects. The activity of the HFC reached a peak in the center of the accommodation range, whereas the activity of the LFC was its maximum in the presence of darkness or blur in the over-accommodation range. Smaller changes in the magnitude of the HFC were observed in older subjects. Although the LFC may be controlled neurologically, the HFC seems to arise from mechanical and elastic properties of the lens, and may be modulated by other physiological rhythmic variations.
在人类受试者中研究了调节刺激和年龄对调节性微波动的影响。使用红外（IR）验光仪测量调节反应，并通过功率谱分析对调节性微波动进行量化。确定了两个频段：低频成分（<0.5 Hz，LFC）和高频成分（1.3至2.2 Hz，HFC）。在较年轻的受试者中，不同受试者对调节刺激的高频成分变化有所不同。高频成分的活动在调节范围的中心达到峰值，而低频成分的活动在过度调节范围内存在黑暗或模糊时最大。在老年受试者中观察到高频成分幅度的变化较小。虽然低频成分可能受神经控制，但高频成分似乎源于晶状体的机械和弹性特性，并且可能受其他生理节律变化的调节。
