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视觉调节.
视觉调节[1][2]（visual accommodation）[3]，简称调节、调节力，是脊椎动物眼睛根据物体距离自身的距离的变化而随时调整眼睛的屈光力，从而确保视觉始终清晰。
哺乳类、鸟类和爬行类主要通过睫状体来改变弹性晶状体的形态，以达到调整眼睛屈光力的目的[4]；其次可由瞳孔扩大缩小来改变焦深及进光量，减少球像差、色像差；最后再借由会聚避免复视。
当视近物时，睫状肌收缩，睫状小带松弛，晶状体变凸，折光率（屈光力）增加，物像前移，因而成像清晰；反之则晶状体变薄。
参考文献
- ^ 存档副本. [2024-02-04]. （原始内容存档于2024-02-04）.
- ^ 存档副本. [2024-02-04]. （原始内容存档于2024-02-04）.
- ^ Ott M. Visual accommodation in vertebrates: mechanisms, physiological response and stimuli[J]. Journal of Comparative Physiology A, 2006, 192: 97-111.
- ^ Augen. www.bio.vobs.at. [11 September 2020]. （原始内容存档于2021-02-25） （德语）.
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