The term 'YOU CAN SEE RIGHT THROUGH IT' can be solved by the following crossword solutions: IRIS (4 letters), PANE (4 letters), CORNEA (6 letters), LENS (4 letters), and GLASS (5 letters). The IRIS is the colored part of the eye, and it controls the amount of light that enters the eye. A PANE is a sheet of GLASS in a window or door. The cornea is the transparent outer layer of the eye that covers the IRIS and pupil. The LENS is a curved piece of transparent material that focuses light onto the retina. Finally, GLASS is a transparent material made from sand, soda, and lime.