Mr. Mark E. Mildebrath Profile

Mark E. Mildebrath

at Essilor of America Inc

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Proceedings Article | 15 January 2007 Paper

Ophthalmic optical coatings: The real world can be more aggressive than you think

Mark Mildebrath, Karl Klemm

Proceedings Volume 6403, 64030W (2007) https://doi.org/10.1117/12.695863

KEYWORDS: Coating, Antireflective coatings, Hard coatings, Optical coatings, Eyeglasses, Ophthalmic optics, Resistance, Eye, Reflection, Thin film coatings

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Ophthalmic antireflection coatings are not normally considered to be in the same category as other traditional optical coatings with respect to environmental damage. However, as a group, eyeglass lens wearers tend to subject their optical-coated eyewear to a broader and more aggressive range of environmental aggressions than at first imagined. This paper presents the environmental aggressions and, in some detail, the resultant coating defects observed in coated ophthalmic optics. Further, development of test methods for defect replication, to enable product improvements will be discussed. Real-life environments combine thermal, chemical, and mechanical "aggressions" which spectacle lenses are subjected to. These aggressions generate optical coating defects and failure modes involving abrasion, corrosion, and loss of adhesion. In addition, market forces driven by retail customer perceptions lead to product liabilities not normally considered to be of any consequence in traditional optical coating applications.

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