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Unformatted text preview: ∞). “Prescription Principle:” Corrective lenses create images of objects outside of the range of clear sight and place those images within the range of clear sight. Refractive Power meters in f P 1 unit: diopters (D) Nearsightedness (Myopia) : Far Point < ∞ Eyeball too long treat as if lens is too powerful, so use concave lens to correct. Prescription: f = – FP Chapter 24 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Farsightedness (Hyperopia/Presbyopia) : Near Point > 25 cm (Hyperopia) Eyeball too short treat as if lens is too weak, so use convex lens to correct. (Presbyopia) ciliary muscles too weak to accommodate close objects. f NP cm 1 1 25 1 Prescription: 25 25 NP NP f...
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- Spring '10
- Physics, Corrective lens, Presbyopia, Dioptre, IUPUI Physics Dept