Refractive Changes in the Chicken Eye Following Lid Fusion
Lid fusion was surgically performed in newly hatched and grown-up chicks for various periods of up to three-and-one-half months. This led to an unusual enlargement of the eyeball in the first group of chicks in all equators, resulting in average myopia of −8.02 D. The value that was obtained in normal eyes was +0.42 D. Simultaneously, an antagonistic procedure, although much smaller, took place, leading to flattening of the cornea and decrease of its refractive power.
Hypermetropia was found in the second group of late-operated chicks if illumination conditions were poor. This was expressed almost only in a corneal change.
In the myopic chicks the two eyes grew independently, while in the hypermetropic chicks the same change, although smaller, was found also for the open eye.
KeywordsRefractive Error High Myopia Benzalkonium Chloride Refractive Power Refractive Change
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