Answer:

lens

Answer	Crossword Clue
LENS	You can see right through it
LENS	Common prescription item
LENS	Choice for a cinematographer

LENS	Part of the eye
LENS	2-Down part
LENS	It helps you focus
LENS	Part of binoculars
LENS	What keeps things in focus?
LENS	Focusing aid
LENS	Telescope part
LENS	It may be labeled 2x or 3x

LENS	Microscope part
LENS	Cataract site
LENS	It changes one's perspective
LENS	Fisheye or zoom
LENS	Camera part
LENS	Light beam bender
LENS	Eye or camera part
LENS	Word after hand or zoom

LENS	Something you can see through
LENS	Eye part
LENS	Main part of a monocle
LENS	Cataract location
LENS	Perspective provider
LENS	Cinematography choice
LENS	Monocle part
LENS	Periscope part

LENS	See-through object
LENS	Magnifier
LENS	It may change your perspective
LENS	... cap
LENS	Projector part
LENS	Word with telephoto or zoom
LENS	Shutterbug's purchase
LENS	Lorgnette part

LENS	Camera's eye
LENS	Lorgnette piece
LENS	Optical device
LENS	Something found in specs?
LENS	Eye piece