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PSY3126 (40)
Lecture 12

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Jon Houseman

IMAGE FORMATION BY THE EYE Cornea rather than the lens is the site of most of the refractive power of the eyes Refraction by the Cornea Light strikes the cornea and passes from the air into the aqueous humor Then light rays bend and converge on the back of the eye see Fig 97Focal distance the distance from the refractive surface to the point where parallel light rays converge and depends on the curvature of the cornea ie tight the curve the shorter the focal distanceDiopter reciprocal of the focal distance in meters The cornea has a refractive power of 42 diopters which means that parallel light rays striking the corneal surface will be focused 0024 m 24 cm Refractive power depends on the slowing of light at the aircornea interface If we replace air with a medium that passes light at about the same speed as the eye the refractive power will eliminated This is why ones vision is blurry when you open your eyes underwater Accommodation by the Lens The lens contributes another dozen or so diopters to the formation of a sharp image at a distance It is however more importantly involved in forming crisp images of objects located closer than about 9m from the eyeA
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