Methods and apparatus for rating eyeglass protection from infrared exposure

US10859466B2 · kind B2 · utility

Assignee

• SHAMIR OPTICAL INDUSTRY LTD. · IL

Inventors

• Zohar Katzman · Shamir, IL
• Gilad Markman · Sachnin, IL
• Devora Nuriel · Petah Tikva, IL

Key dates

• Filing date: Feb 16, 2017
• Grant date: Dec 8, 2020
• Expiry date: Feb 24, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/958
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Conventionally, eyewear is rated in terms of its absorption coefficient (sometimes called the optical density (OD)) or the protection that it provides from ultraviolet (UV) radiation, which can damage the eye at high enough power levels. Infrared (IR) radiation can also damage the eye, but IR damage tends to occur at a much slower rate than UV-induced damage. Rating eyewear in terms of protection from IR radiation and/or in terms of a maximum safe exposure duration (SED) to IR radiation improves consumers' ability to protect themselves from IR radiation. In addition, eyewear rated for more IR protection or longer SED may still provide excellent vision thanks to coatings that reflect or absorb IR light and transmit visible light.