McCarthy, Siobhan; Megaw, Pam; Devadas , Malini; Morgan, Ian
Placing a translucent diffuser over the eye of a chick causes the eye to grow excessively, resulting in form-deprivation myopia. For chickens kept on a 12:12 h light/dark cycle, removing the diffuser for 3 h during the light period protects against the excessive growth, but if the bird is kept in the dark for this 3-h period, the protective effect is abolished. Injecting dopamine agonists into the eye during this 3-h dark period restores the protective effect, which can be blocked by dopamine...[Show more]
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