The term 'see-through glass' can be described by the four-letter word 'LENS'. A LENS is a curved piece of transparent material, such as glass or plastic, that is used to refract light in order to form an image. Lenses are commonly used in eyeglasses, cameras, and other optical instruments. They can also be used to magnify objects or focus light. See-through glass is a type of LENS that is transparent, allowing light to pass through it without being refracted.