Exs 3.5 - Eyes and Vision Exercise 3.5 Anatomy of the Eye...

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Eyes and Vision Exercise 3.5
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Anatomy of the Eye Three walls or “tunics” Outer fibrous layer: sclera and cornea Middle vascular layer: choroid Inner layer: retina The lens, suspended by a suspensory ligament attached to the ciliary body, divides eye into anterior and posterior cavities Anterior cavity : filled with aqueous humor ; further divided into ant/post chambers by colored iris Iris : musculature diaphragm that regulates entry of light into the eye through the pupil Posterior cavity : filled with vitreous humor
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Figure 10.31
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Figure 10.33
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Refraction: Test for Visual Acuity and Astigmatism Light rays are bent (refracted) when they pass from air to a medium of greater density Light rays are refracted by: the cornea, aqueous humor, lens, and vitreous humor Rays focus on the retina and form inverted image, reversed from left to right Refractive power of cornea and vitreous humor are constant Strength of the lens’ ability to refract light is greater when lens is more convex Strength of lens are expressed in diopters Strength (diopters) = 1/focal length (m)
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Visual Acuity Visual acuity: sharpness of vision Emmetropia: normal visual acuity (20/20) Myopia: nearsightedness (can’t see far) Image brought into focus in front of retina Concave lens to correct Hyperopia: farsightedness (can’t see close) Image brought into focus behind retina Convex lens to correct Astigmatism: abnormal curvature of the cornea or lens
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Exs 3.5 - Eyes and Vision Exercise 3.5 Anatomy of the Eye...

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