Page 4 - Cahier-Materials-and-Treatments-USA.indd

Contents Contents 3 Strength and protection Resistance to impact A 1) Mechanics of breakage p.42 2) Impact resistance standards p.43 B Protection against light 1) The need to protect the eye from solar radiation p.45 2) General points regarding filter lenses p.46 FILES Supplement: Characterization of the transmission properties p.48 of an ophthalmic lens 3) Filter lenses with fixed transmission p.50 OPTICS b) UV- and blue-light-filtering lenses a) Sunglass lenses c) Polarized lenses d) Special filters Supplement: Manufacturing technology of filter lenses p.54 OPHTHALMIC 4) Filter lenses with variable transmission p.56 with fixed transmission a) General principle of photochromics b) Photochromics in plastic lenses Supplement: Characterization of photochromic lenses properties p.58 c) Photochromics in glass lenses Supplement: Manufacturing technology of filter lenses with variable transmission p.61 4 Aesthetics and fashion A Lens curvature p.62 B Tinting p.63 C Reflections p.63 Conclusion p.64 Appendix: Review of the nature and structure of matter p.65 4 3 Copyright © 2010 ESSILOR ACADEMY EUROPE, 13 rue Moreau, 75012 Paris, France - All rights reserved – Do not copy or distribute.