HardCoat Lenses
HardCoat Lenses
A Hard Coat Optical Lens refers to an optical lens—commonly made from plastic or resin—that has been coated with a hard, scratch-resistant layer. This coating is designed to significantly increase the lens’s durability, abrasion resistance, and lifespan, especially since plastic lenses are generally softer and more prone to scratching compared to glass lenses.
Key Features of Hard Coat Optical Lenses
- Scratch Resistance: The main purpose of the hard coat is to protect the lens from everyday scratches and abrasions, improving the lens’s longevity and preserving optical clarity.
- Application Methods: Hard coatings may be applied using a thermal dip (where lenses are bathed in a hardening solution and cured in an oven) or a UV-cured spin coating (where a liquid solution is spread and hardened via ultraviolet light).
- Material Compatibility: While both glass and plastic lenses can receive coatings, hard coatings are especially important for plastic (resin) lenses due to their softness.
- Performance: Hard coated lenses retain high optical quality and can maintain more than 90% light transmission, enhancing the wearer’s vision with minimal impact on lens clarity.
- Maintenance: Hard-coated lenses are easier to clean than uncoated lenses but still require care to maintain the coating.
Hard coat is often used as a base layer before additional coatings, such as anti-reflective or hydrophobic coatings, are added to further enhance lens performance.
Typical Appearance
A hard coat itself is usually transparent and does not noticeably change the lens’s color or appearance. Lenses may appear glossier and less prone to visible fine scratches.
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