BSCI 207 Lecture Notes - Lecture 32: Pax6, Amphiprioninae, Opsin
18 Nov 2016
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Document Summary
Steps as light travels through the environment: illuminant sets stage of what can be seen. There are many ways of capturing and using light. Camera style eye: there is a single element (lens) with many receptors behind it. The pinhole eye is the simplest type of camera style eye, with light directly hitting photoreceptors without being focused by a lens: light can also be focused by reflectors instead of a lens. Compound eye: each photoreceptor has its own lens. The different ways of resolving images suggests that eyes evolved many times throughout evolutionary history. A depression first formed in the skin with photoreceptors in the depression: this can only detect the presence of light; it could not resolve an image. The evolution of the eye could have proceeded in one of two ways: pinhole route. Depression deepened and the pinhole narrowed that allowed some special resolving. This allowed a higher resolution image to be formed: lens route.
