The possessive form for the plural noun glasses is glasses'.Example: Her glasses' frame broke when she dropped them.
You have to find the LC (the least countable) of the tool.
X-ray glasses do not work. That's science fiction. There are no X-ray glasses you can wear and see through things.
Pvc is used to make dissposable glasses
The noun 'electricity' is a mass noun, a word for something that is indivisible into countable units.
countable
countable
The noun 'hill' is a countable noun. The plural form is 'hills'.
cookies are countable unless you have brain problems
countable
Shark is a countable noun.
Prawn - prawns is the plural - is a countable noun
Duck as an animal is countable, but if you mean the meat it is uncountable.
Countable
few is countable
countable
The word hair can be both a countable noun and a non countable noun, depending on how it is used. For example in the sentence "Mary has long blonde hair", it is non countable. In the sentence "Dad is getting a few gray hairs" it is countable.