ACCOMMODATION, REFRACTIVE ERROR AND EYE GROWTH IN CHICKENS
ACCOMMODATION, REFRACTIVE ERROR AND EYE GROWTH IN CHICKENS
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DOI：
10.1016/0042-6989(88)90113-7
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发表时间：
1988-01-01
期刊：
影响因子：
1.8
通讯作者：
HOWLAND, HC
中科院分区：
文献类型：
--
作者：
SCHAEFFEL, F;GLASSER, A;HOWLAND, HC
我们在鸡的眼睛前面放上不同度数的散焦透镜。为此，他们的头上戴着用柔软、薄皮革制成的小头巾。镜片通过维可牢尼龙搭扣连接到罩上，并且可以容易地移除以进行清洁。晶状体的屈光度使得它们的光学效应可以通过调节来补偿。用红外视网膜检影法证实，鸡的视网膜图像能保持清晰。 佩戴透镜导致非睫状肌麻痹屈光状态（在不佩戴透镜的情况下测量）的一致偏移，该偏移方向为补偿透镜。我们使用了一种灵敏的技术（精度= . ±. 50 μ m，如从重复测量的可变性估计的），以测量用晶状体生长的鸟的切除的眼睛中的后节距离（PND）。反过来，PND用于比较用不同镜片治疗的眼睛。结果发现，与使用正镜片治疗的眼睛相比，使用负镜片治疗的眼睛的PNd增加。这种效应在双眼中独立发生，并且不是由于角膜曲率的变化。我们讨论了我们的结果在一个闭环反馈系统的眼睛生长的调节。
We raised chickens with defocusing lenses of differing powers in front of their eyes. For this purpose, small hoods made from soft, thin leather were carefully fitted to their heads. Lenses were attached to the hoods by velcro fasteners and could be easily removed for cleaning. The powers of the lenses were such that their optical effects could be compensated for by accommodation. It was verified by infrared (IR) photoretinoscopy that the chickens could keep their retinal images in focus. Wearing a lens resulted in a consistent shift of the non cycloplegic refractive state (measured without the lens) which was in the direction to compensate for the lens. We used a sensitive technique (precision = .+-. 50 .mu.m as estimated from the variability of repeated measurements) to measure the posterior nodal distance (PND) in excised eyes of birds grown with lenses. The PND, in turn, was used to compare eyes treated with different lenses. It was found that the PNd was increased in eyes which were treated with negative lenses compared to those treated with positive lenses. This effect occurs independently in both eyes and it is not due to changes in corneal curvature. We discuss our result in terms of a closed-loop feedback system for the regulation of eye growth.