![]() Definition of a diopter is demonstrated, along with lens stacking to create more powerful convergence. The red lenses are “minus” while the black lenses are “plus” Lenses are marked with diopter power. A lens can be thought of as two prisms … that either converge or diverge light. (comments below) The goal of this video is to completely understand what a glasses prescription entails. ![]() I hope you find this useful! Screen Captures from this Video: While this lecture is “basic” and assumes you have no prior glasses experience … this is still important stuff. This includes lens theory, basic spherical problems (near and far-sightedness), astigmatism, cylinder conversion, and presbyopia (bifocals). In this video, I try to explain the basic topics I wish I had known. When I began my ophthalmology residency, I had no idea how to read or write a glasses prescription. This video covers the basic optics you need to know to understand basic glasses prescriptions. ![]()
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