By Troy Fannin OD, Theodore Grosvenor OD PhD FAAO
Study from knowledgeable with greater than forty years event. This vintage textual content successfully covers a extensive variety of knowledge on ophthalmic optics. Its presentation of optical techniques and formulae is made understandable, even on an introductory point, via transparent motives, diagrams, and medical functions
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FIGURE 2-14. Perspective drawings of toric surfaces: A, plus power in both principal meridians; B, minus power in both principal meridians; C, plus power in one principal meridian and minus power in the other. 9. 7. Lens Blanks and Base Curves A lens manufacturer makes (or obtains) optical glass in the form of rough blanks. A rough blank is a relatively thick, molded piece of optical glass that must be ground and polished on both sides. Once one of the surfaces has been ground and polished, it is called a semifinished blank.
T h e axis of the cylindrical lens shown in this diagram is located in the vertical meridian, with the result that the focal line (located in the vertical meridian) is formed by refraction of rays in the horizontal meridian. Since no refraction occurs in the vertical meridian, the length of the focal line (for rays coming from a distant axial FIGURE 2-26. Image formation by piano plus cylinder. The point image is replaced by a focal line located in the vertical meridian, formed by the refraction of rays in the horizontal meridian.
A spherical surface is generated by rotating a circle or an arc about one of its diameters, as shown in Figure 2-5. T h e intersection of any plane passing t h r o u g h a spherical surface will always be a circle. A great circle is formed on a spherical surface when it is intersected by a plane passing through the center of the sphere, and the curvature along any great circle is equal to the curvature of the generating circle. T h e shortest distance between two points on a spherical surface is the flattest arc connecting them.