On the basis of 43 spectacle glass injuries, an estimate is derived concerning the magnitude of ocular injuries from lens fragments. An additional 171 injured patients are surveyed from 35 previous publications on trauma. Over 200 cases have also been collected from surveys in New Jersey, Massachusetts, and Virginia. Analysis of refraction in our patients shows myopia represented three times more frequently than hyperopia, whereas the reverse probably prevails in the general population. Increasing sales volume and greater fragility of minus lenses predispose to over-representation of the myope. Causative mechanisms reflect commonplace articles of low velocity and not unusual size. Allyl-resin lenses were not involved in any of the injuries. Heattreated glass or allyl lenses offer several-fold increased impact resistance. Polycarbonates and ion exchange treated glass offered further protection. Spectacle frame design should be correlated for optimal lens retention and energy attenuation.
Keeney AH, Fintelmann E, Estlow B. Refractive Correction and Associated Factors in Spectacle Glass Injury. Arch Ophthalmol. 1972;88(1):2–8. doi:10.1001/archopht.1972.01000030004002