Comment Re:if it doesnt work (Score 5, Informative) 464
Thanks for the elaboration, so there's basically four different styles of glasses? Is there another 'professional' or 'official' name for normal glasses or they're basically just 'glasses' and we refer to everything else with those names? I expect there's probably a more professional name than 'coke bottle'.
"Coke Bottle" is a pejorative term referring to the lensing effect on the persons eyes in order to correct their vision. The most common reason, historically, for "Coke Bottle" lenses was cataract surgery to remove the lens of the eye, before we had the ability to replace the lens. Mostly they are provided to very small children these days, when cataracts occur earlier, and general replacement of the lens is contraindicated.
The generic professional term for all non-vanity based glasses is "corrective lenses".
There are various lenses for various conditions:
- "myopia" is near-sghtedness
- "presbyopia" is far-sightedness, and if age related, is usually corrected by over the counter "readers" or "reading glasses"
- "macular degeneration" can be age related, or caused by a number of other conditions, such as diabetes, and results in damage from the center of the retina outwards; special glasses can "work around" the problem by focussing all light as a ring around the retina outside the area of damage, and depend on the ability of the brain to reintegrate it into a normal field of view.
- "Keratoconus" is a cone shaped cornea that will prevent a full field of view, since light no longer focusses un the retina; unlike macular degeneration, there is no retina damage, and this is fully correctable with special lenses.
Generally, if you care about thee things, or just find them interesting, you can always stop by a not-very-busy Len Crafters or other similar store, and chat up their optometrist or opthamologist, or just read about them on the net.