I wear glasses but don't know anything about them, can you tell me more?
They are also known as eyeglasses or spectacles, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, 
Ok that cool
Safety glasses provide eye protection against flying debris
when was the first glass invented
Not really sure yet ,but Glasses are typically used for vision correction, such as with reading glasses
you have mentioned safety glasses and reading glasses what other types are out there?
How about the common Sunglasses allow better vision in bright daylight, prevents from  high levels of ultraviolet light.
Thanks for enlightening me about glasses
Have you used contact glasses before?