Quality control varies especially in discount optical stores. To ensure that the lenses are made to the exact prescription it is important to request a print-out of an auto-lensometer. It's also important that the interpupillary distance is measured with a pupilometer.(not just a ruler). Safest to get glasses from an OPTOMETRIST with 7 years University education compared with an OPTICIAN with 2y full-time or (4y part-time) at a Community College). It is absurd that insurance companies and Unions pay for for new specs very two years. Unless there is eye disease, lenses in an adult before 45y need not change After 45y a change every 5-7 y is usual. A good frame can last for life., e.g. if gold. Only the lenses require changing..
A problem is the use by some optical chains of cheap Chinese frames costing as little as a dollar.or two. The mark-up is magnificent. .
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