What is the plural possessive form of the word lens?

Answer 1

Glasses are a plural form for glass (a drinking glass, or a lens).

To indicate the plural of glasses (eyewear, a pair of eyeglasses), you would have to use the description "pairs of glasses."

Answer 2

The plural for lens is lenses, rather than just lens.
Lenses.

Answer 3

There is no word "lense." If you meant "lens" the genitive plural is lenses'

Answer 4

The plural for lens is lenses, rather than just lens.