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Bar spring eyeglasses: a type of pince-nez
Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1997
Abstract:
Because of the discovery of astigmatism, a type of lens fixation was needed in eyeglass (pince-nez) frames to maintain a constant angle for the patient's astigmatism. Bar spring frames were an answer to this problem.