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In the laboratory, the prescription eye glasses start off as lens blanks, which are either made from a plastic or glass disc that is about four inches wide and up to one and one-half inches thick. The blank lens has a flat back surface and a curved front surface.
How to Choose the Best Lenses for Your Prescription Glasses. Single-vision prescription lenses are for people who need to correct one field of vision, either distance or near. Using the highestâquality CRâ39 and polycarbonate lenses, we can fill prescriptions between -10.00 and +6.00 sphere, or up to +/-4.00 cylinder.