Lecture12 - 9.1 The Human eye Lecture 12 9.1 The human eye...

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Lecture 12 9.1. The human eye Unaided Eyeglasses Color perception 9.1 The Human eye Seeing is probably the sense we have Even from the engineering point of view the eye is an amazing instrument Parts of the human eye Imaging of the human eye Meniscus convex lens The human eye as an optical system A.S GRIN lens n=1.376 n=1.0 n=1.336 n=1.337 n=1.406...1.386 Accommodation Relaxed muscle: We focus on infinity Strained muscle: We focus on something closer by. For most people 25cm is still rather comfortable Why don’t we see well underwater ?
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Dioptric Power Convenient quantity because it is additive (for thin lenses in contact) In physiological optics lenses are characterized in terms of their dioptric power (unit diopter, 1/m) Consider double convex lens = + We can also define the dioptric power for each interface Nearsightedness For a relaxed muscle A point in infinity is focused in front of the retina The far point is not at infinity How do we correct for that: We image the far point to infinity
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