The term 'see-through item' can be solved by four different crossword solutions: LENS, IRIS, PUPIL, and PANE. A LENS is a curved piece of glass or plastic used to focus light, such as in a camera or eyeglasses. The IRIS is the colored part of the eye that controls the amount of light entering the PUPIL. The PUPIL is the dark center of the eye that allows light to enter the retina. Finally, a PANE is a sheet of glass in a window or door. All of these items are see-through and can be used to view the world around us.