Loop M S, Sherman S M
Brain Res. 1977 Jun 10;128(2):329-39. doi: 10.1016/0006-8993(77)90998-2.
We were able to train cats raised with sutured eyelids to perform simple brightness discriminations before their lids were parted. If, and only if, a small hole was present in a lid, could some of the cats also perform a grating orientation discrimination. By establishing their thresholds for the brightness discrimination before and after dark adaptation and before and after the lids were opened, we reached three main conclusions. (1) During dark adaptation (with pupils maximally dilated and retinae most sensitive, regardless of lid suture), the cats were 3-4 log units more sensitive with the lids open than with the lids closed. This indicates a 3-4 log unit attenuation for the lids which is in agreement with our photometric measurements. (2) During light adaptation, the sensitivity difference between the conditions of opened and closed lids was only 1-2 log units. We concluded that factors (such as pupil dilatation and retinal sensitivity) partially compensated for the lid attenuation, since the open eye could have a smaller pupil and less sensitive retina during light adaptation. (3) Given these potential compensatory features of the pupil and assuming consensual pupil sizes, the deprived eye of a monocularly sutured cat may suffer more photic deprivation (since the pupil behind the closed lid would be as constricted as the pupil in the open eye) than would either eye of a binocularly sutured cat (where both pupils can be relatively large).
我们能够训练那些眼睑被缝合饲养的猫，使其在眼睑张开之前就能进行简单的亮度辨别。只有当眼睑上有一个小孔时，其中一些猫才能进行光栅方向辨别。通过确定它们在暗适应前后以及眼睑打开前后的亮度辨别阈值，我们得出了三个主要结论。（1）在暗适应期间（无论眼睑是否缝合，瞳孔最大程度扩张且视网膜最敏感），猫在眼睑张开时比眼睑闭合时敏感3 - 4个对数单位。这表明眼睑造成了3 - 4个对数单位的衰减，这与我们的光度测量结果一致。（2）在明适应期间，眼睑张开和闭合条件下的敏感度差异仅为1 - 2个对数单位。我们得出结论，一些因素（如瞳孔扩张和视网膜敏感度）部分补偿了眼睑的衰减，因为在明适应期间睁开的眼睛可能瞳孔较小且视网膜敏感度较低。（3）考虑到瞳孔的这些潜在补偿特性，并假设瞳孔大小一致，单眼缝合猫的被剥夺眼可能比双眼缝合猫的任何一只眼睛遭受更多的光剥夺（因为闭合眼睑后的瞳孔会像睁开眼睛中的瞳孔一样收缩）（在双眼缝合的情况下，两个瞳孔都可以相对较大）。
