PSYC 2390 Lecture : Lecture January 24
24 Jan 2012
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Document Summary
The cornea is a clear structure, functions to let in light, but is also hard and strong, does 80% of focusing, when you change the shape of the cornea, you change your focus, for nearsightedness and farsightedness. Fluid is used in the eye to cushion blows, etc, the fluid is under pressure. In severe cases they removed the cornea, take out the damaged part and replace it (corneal replacement) Astigmatism, malformation of the cornea, it should be round like a bowl, but some peoples are more like a spoon shape, they have problems focusing certain kinds of light, certain line orientations. The iris is a double ring of muscles, and the pupil is a hole, iris controls how wide the pupil is. Depth of field if the pupil is as small as it can be to let in enough light, more things will be in focus. Width of pupil varies with level of excitation or arousal.
