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The optics of Prescription Eyeglasses
By Timothy Gorman
There are estimated 168 million people who wear prescription eyeglasses in the United States. Only a very small percentage of those people could tell you what strength their lenses are or read an eyeglass prescription.
The strength of prescription eyeglasses is measured in what we call diopters. Optometrists abbreviate that with a D. The stronger the lens, the higher the diopter measures. Prescription eyeglass lenses are measured in positives or negatives. If you look through a negative lens the object that you are focusing on will look smaller. If looking through a positive lens, the object will look bigger.
There are three professions that deal with prescription eyeglasses that...
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