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This module starts with an introduction to anatomy and physiology of the eye. Different lens designs, prescription, true powers, transposition, metric system and diopter power are discussed. Students learn to calculate the horizontal and vertical powers. Refractive errors are discussed. Prentice’s Rule is introduced and students calculate induced prism. Strabismus is discussed and students learn about prescribed prism. Students receive hands-on experience in lensometry, frame measurements and patient measurements. Students practice the steps required to fabricate a pair of glasses with prescribed prisms. ANSI standards are presented and students' projects are checked according to the standards. Students learn how to tint lenses, and students practice salesmanship through role-playing. Students are introduced to the personal computer and gain experience utilizing a variety of instructional programs related to theoretical concepts taught in this module.


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