Glasses are basically optical devices, which fall under the category of Lenses. Mirrors also fall under the category of optical devices. The basic difference between mirrors and lenses is the underlying principle. Mirrors work on the principle of... read more
When light that is traveling through air hits a glass surface at an angle, it changes its course. Similarly, when light that is transmitted through glass hits air at an angle, it changes course again. Optometrists use these two facts to bend light so that it is better focused for our eyes. The cornea does something similar for our optic nerves, but sometimes our eyes are imperfectly shaped, become inflexible due to aging, etc. So, we need the assistance of glasses to improve on what our eyes do naturally.
by blessedp5 years ago
Can drinking hot beverages damage the lenses of my glasses?I was told exposure to heat caused the film on my lenses to wrinkle. I am exposed to no other but drinking hot beverages while wearing my glasses. ...
by Helen Murphy Howell6 years ago
Why do so many of us need glasses/contact lenses or whatever? Even although there are billions of humans on this planet, there is still a high proportion of us who need some form of correction for poor eyesight - from a...
by Edward Zhang6 years ago
The pros and cons of glasses vs. contacts?I wear glasses, and I've always been weary of wearing contacts. I've heard stories about contacts rolling to the back of eyes and drying out while napping, etc.
by Liam Hallam5 years ago
Having spent 18months on hp with some success I'm starting to see the logic in diversifying to other sitesWhere do others recommend? I've had a look at squidoo and find the sports content to be far weaker than hubpages....
by Elena4 years ago
Glasses or Contact lenses, which do you prefer to wear and why?
by Mark Knowles10 years ago
Jerrico -Whilst I appreciate the fact that you took the trouble to email me personally, I do not believe you did so for any other reason than to get my email address or some other unfathomable one that I can only guess...
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