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双重调节

名词解释题
2021-09-01 14:42
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为鸟类所特有。指眼球的前巩膜角膜肌能改变角膜的曲度(其他动物均无此能力),后巩膜角膜肌能改变晶体的曲度(此点类似哺乳类等陆地动物),因而它不仅能改变晶体的形状(即改变曲度)以及晶体与角膜间的距离,而且还能改变角膜的曲度,这称之为双重调节。故鸟类的视力很好,这还与调节眼球的前、后巩膜角膜肌是横纹肌有关,因横纹肌能快速收缩和舒张,因而能快速改变眼的焦距而改变视物的距离。


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