The phrase "seeing glass" can refer to a number of different items, each with their own synonyms. For example, a "seeing glass" could refer to a pair of eyeglasses or prescription lenses, which might also be called spectacles, glasses, or contacts. If instead the reference is to a handheld magnifying glass, then synonyms for "seeing glass" might include magnifier, loupe, or monocle. A "seeing glass" might also refer to a telescope or binoculars, which could be called a spyglass, a field glass, or a pair of opera glasses. Finally, some might use the term "seeing glass" to describe a mirror, which could also be called a looking glass or a reflective surface.