Accident prevention in the United States has been pushed by safety engineers for years. In some past analyses1 of industrial accidents it was found that as high as 25 per cent were to the eyes. It was easy to provide side-screens, but ordinary ophthalmic lenses gave only limited protection. Large and small particles, coming with force, shattered these lenses, and often the cutting edges of the shattered glass added to the danger by inflicting additional wounds.
Substitution for the lenses was attempted: Fine wire mesh, isinglass, two lenses cemented together, isinglass and one ophthalmic lens together and wire mesh with one ophthalmic lens were all tried and discarded as unsuitable for this use. The formula of ophthalmic lenses could not be altered to accomplish any hardening process in a transparent medium. The workers therefore returned to the original formula.2 Ordinary ophthalmic glass is a "soda lime"
DAVIDSON HP. HARDENED OPHTHALMIC LENSES. Arch Ophthalmol. 1935;14(3):484–489. doi:10.1001/archopht.1935.00840090170015
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