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An attachment holding an auxiliary lens or lenses (an add, a prism or a tint) in front of spectacles by spring action. There are many (albeit similar) types of clips that fit over one lens of a pair of spectacles (e.g. Bernell clip, Bommarito clip, Halberg clip, Jannelli clip). They are used extensively in the refraction of low vision patients. Syn. clip-on; fit-over; trial lens clip.