Page 4 - Cahier-Matériaux-et-Traitements-GB.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: Characterisation 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) Polarising 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 photochromism b) Photochromism in plastic lenses Supplement: Characterisation of photochromic lenses properties p.58 c) Photochromism in glass lenses Supplement: Manufacturing technology of filter lenses with variable transmission p.61 4 Aesthetics and fashion A Curving p.62 B Tinting p.63 C Reflections p.63 Conclusion p.64 Appendix: Review about the nature and structure of the matter p.65 4 3 Copyright © 2010 ESSILOR ACADEMY EUROPE, 13 rue Moreau, 75012 Paris, France - All rights reserved – Do not copy or distribute.