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. Students receive hands-on experience in lensometry, frame measurements, patient measurements and progressive lens mapping techniques. Students practice the steps required to fabricate multifocal glasses using plastic, metal and nylon-chord frames. Vertical imbalance, slab-off, and image jump are discussed. ANSI standards are presented and students' projects are checked according to the standards. Students learn how to tint lenses. Students gain practical experience utilizing a variety of instructional programs related to theoretical concepts taught in this module.
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