Spectacles predates glasses by about 200 years but essentially means the same thing. Spectacles comes from a word meaning "to observe" while glasses comes from what the spectacles were, and are, made from.
The lenses are called "corrective" because they improve vision by allowing the eye to focus properly. If you are asking why glasses are referred to by the seemingly technical term it is because it includes implanted, contact and eyeglass lenses.
It would also ruin this joke:
-A police officer is talking to a motorist he has pulled over-
glasses are 'des verres' in French. If you think of spectacles, they are called 'lunettes'.
If a person is wearing spectacles it means he is wearing a pair of glasses. The word spectacles is rarely used in this day and age.
I assume glasses refers to spectacles? If so, then the hinges allow the two arms of the spectacles to lay flat when not being worn.
You just wear them over your glasses. The 3d glasses are a bit bigger than normal glasses so they will easily fit over your spectacles.
Spectacles and glasses are exactly the same in meaning but different in usage. The word spectacles is considered to be an old-fashioned and formal term for Americans but it is still used in British.
Glasses (ie. spectacles)
glasses, spectacles
Spectacles is a plural. As a noun, plural terms which are equivalent to their singular term (consider glasses) are usually used without change. I.e.) He wears glasses (singular) They all liked their glasses (plural). The spectacles were quite useful (singular). No matter how many spectacles (plural) you own, one is often enough.
no...
glasses
Glasses for lasses.
Spectacles is another name for glasses and you wear them on your face/head