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Lens Form & Analysis

Course Introduction
In this session we will cover the actual shape and design of prescription ophthalmic lenses. In doing so we'll discuss spheres and radius of curvature. Modern day corrected curve lenses will then be discussed along with the rationale for the use of the commonly recommended base curves. The importance of routine use of the lens clock will be emphasized followed by a discussion of cylindrical shapes and their use in prescription ophthalmic lenses for the correction of various astigmatisms both by themselves and in combination with spheres. The power cross will be covered to aid in determining the power of a compound lens in its various meridians and to gain a better understanding of lens transposition. Finally, vertex distance compensation for higher powered lenses will be discussed.