I was surprised to find I could order swim goggles with corrective lenses for $40 without a prescription. They work great! But my real glasses cost many hundreds of dollars and required a prescription. Why? Too big a gap to just be a regulatory tax, right?
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How do they correct without a script? I wear $20 glasses all the time, but supplied a script with PID and +\- for each eye.
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Oh! I always thought corrective goggles would be an internal lenses inside a standard goggles housing—and then the same lenses as any glasses.