Learn about the Emmetopic or normal eyes’ ability to correctly refract light onto the retina to form an image that retinal photoreceptor cells convert into electro-chemical signals. The optic nerves of each retina transmit these signals to the brain where they are sorted and interpreted. We see with our brains.
Learn about the abnormal or ametropic eye and three types of refractive error; myopia, hyperopia and astigmatism. Learn why abnormalities in the size or shape of the eye cause errors in refraction causing refracted light to form an image before reaching the retina (myopia), beyond the retina (hyperopia) or to form more than one image with more than one focal length with at least one image not forming on the retina (astigmatism).
Learn about the eyeglass lens exam and how distance and near vision is measured. Understand how to read a Snellen chart. Learn the parts of the prescription. Learn the meaning of the abbreviations. Learn how to transpose a prescription and how to determine the reading or intermediate power from the distance and Add power.
Learn about the type of lens used to correct the different types of refractive error and presbyopia. Understand how these lens types change the refractive power of the eye to bring light to focus on the retina.
Learn about the different lens material indices and their properties i.e. reflectivity, tensile strength, abbe, impact resistance and UV radiation transmission levels.
Learn about the differences between conventional progressive design and surfacing versus digital design and surfacing. Understand that the digital advancement in lens design and surface application allows us to create a more tailored lens for the patient. Understand that digital design optimization allows lens surface aberrations to reduced to mathematical limits. Know that minimizing aberrations dramatically reduces marginal astigmatism to improve peripheral vision and increase usable areas throughout the lens.
Learn about lens enhancement options that improve vision through a lens, i.e. anti-reflective coating, polarized, photochromic, blue filter lenses for everyday use and aspheric single vision.
Learn about the most used frame styles and materials. Know the parts of a frame. Know how to determine ‘box’ measurements, the geometric center of the eyewire, the ‘A’, ‘B’ and ‘ED’ measurement the frame PD (FPD). Review a few basic frame adjustments.
Learn about the importance of selecting a well fit frame to minimize decentration for best optical outcome. Learn proper fitting and measurement techniques and their impact on the visual performance of the lens.
Learn basic troubleshooting procedures and solutions for common problems.
Learn some basic anatomy and about some common eye maladies such as cataracts, age related macular degeneration, photokeratitis, conjunctivitis and tear film abnormalities. Learn how each of these impacts vision.
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