Testing for the Impact Resistance of Ophthalmic Lenses.

摘要

The principal findings of the Optical Manufacturers Association's Research Associate Program are summarized. The limitations of the present drop ball test for impact resistance are discussed. Essentially,only a small part of the lens surface and a small part of the edge are subjected to sufficiently high stresses. It is therefore desirable to replace the drop ball test with a sampling procedure from which meaningful information on lens quality can be obtained. Some aspects of the design of a sampling plan,in which the overall quality of a laboratory's lenses is monitored by periodically testing a set of coupon lenses,are discussed.