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How do you differentiate good, quality eyeglasses from cheap specs? The first thing to check would be the quality of frames. There are several materials available but a good pair of eyeglasses has frames that are hypoallergenic, lightweight, strong, corrosion resistant and come in a variety of colors. The next aspect would be the materials used to make the lens. Polycarbonate lenses can be found in most good eyeglasses as they are thinner, lighter and far more impact-resistant. Cheap specs normally use regular plastic lenses that gives a not-so-sharp vision. The coating of the lenses can also be the basis of between a good, quality glasses versus the cheap specs. Good eyeglasses use anti-reflective coating, scratch resistant coating, anti-fog coating and ultraviolet treatments to make the lens perform better allowing it to last longer. Cheap specs would only use thin coatings just enough to make sure the lens perform better.