Tips-A2Z: The best tips on (Health) Optics/glasses/spectacles

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All | Discussion (0)Optics/glasses/spectacles (General)

Cleaning your glasses: NEVER clean your lenses when they are dry. If the lenses are dry then you will grind dust into the lenses, causing them to scratch. It is best to first rinse the glasses off before cleaning them. Always use water, or special glasses cleaner. Don't use alcohol or acetone. Use only a soft microfiber cloth to carefully wipe the lenses. ^{thesource (378)}

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Don't buy your glasses at a "boutique" store, or you will pay many times more than what you need to. Get your prescription only, and make sure the optometrist records your "pupillary distance" (PD) on your prescription. Then you can find a cheap place online, and order your glasses online. Make sure that the frames you buy are the correct width for your face, and that the lens height is high enough for the kind of lenses that you need. Progressive lenses require more lens height. If ordering reading, or computer glasses online then you will need to provide the "Add" number on your prescription (or add the "Add" number to the "sphere" number, for each eye, if there is no provision to provide it). ^{thesource (378)}

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Polycarbonate lenses can produce slightly less sharp images than plastic or glass lenses, but are thinner, lighter, stronger, and more scratch resistant. They are also UV resistant. Glass is the best optical material, but is significantly heavier, and shatters more easily. Plastic (CR-39) is the most popular material for glasses lenses, and is a compromise between the two. ^{thesource (378)}

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If you don't have your glasses and you are near-sighted (can't focus on the distance) then you can use the camera on your phone to focus on what is distant, and view the image on your phone. ^{thesource (378)}

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