Clinical Optics by Troy Fannin OD, Theodore Grosvenor OD PhD FAAO

By Troy Fannin OD, Theodore Grosvenor OD PhD FAAO

Research from a professional with greater than forty years event. This vintage textual content successfully covers a vast variety of data on ophthalmic optics. Its presentation of optical thoughts and formulae is made understandable, even on an introductory point, via transparent motives, diagrams, and medical purposes

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The circle of least confusion is located at such a point that its dioptric power is midway between that of the two focal lines. bundle of rays from a single object point is refracted by a spherical lens, if aberrations are neglected (Figure 2-25). Synonyms for homocentric are monocentric and stigmatic (the root stigmatic meaning point). Astigmatic. An astigmatic bundle of rays is one in which all rays from a single object point fail to meet, after refraction by the lens, at a common point, but form two line images perpendicular to one another (Figure 2-27).

The lens measure on a convex surface. The position of the central pin measures the sagitta of the surface. 523, the movement of the central pin for each diopter of refracting power of the surface can be determined by solving Eq. 0956 mm. 523, with the result that the reading is in error, being slightly high. Another instrument used in ophthalmic laboratories to measure curvature is the curve gauge. A curve gauge is a brass template having curved edges with curvatures corresponding to dioptric values marked on the gauge (see Figure 2-10).

If the convex piano-cylindrical lens is now replaced by a convex toric lens, not one, but two focal lines will be formed (Figure 2-27). In this diagram, the horizontal meridian is the meridian of greatest refraction, with the result that the vertical focal line, V (formed by refraction of rays in the horizontal meridian), is formed closer to the lens than the horizontal focal line, H (formed by refraction of rays in the vertical meridian). If the screen is placed at a short distance in front of or behind either of the two focal lines, a blur ellipse will be formed, whose major axis will be parallel to the focal line in question.

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