Sunglasses have a complex structure and diverse functions, mainly composed of the following parts:
Lens:
Tinted Lenses: The color of the lens determines its absorption effect on the spectrum. Common colors include gray, yellow, gold, amber, brown, green, purple, and rose, each with its specific light filtering and protection effects.
Polarized Lenses: Through polarizing filters, these allow only vertically polarized light to pass through, reducing glare.
Photochromic Lenses: The silver chloride or silver halide molecules in the lens change shape under ultraviolet light, absorbing visible light and achieving an automatic darkening effect.
Reflective Layer:
Mirrored Reflective Sunglasses: These have a semi-silvered surface that reflects some light, enhancing protection against overhead light. However, the reflective layer is easily scratched and requires additional scratch protection.
Coatings:
Anti-reflective Coating: Reduces glare by adjusting the refractive index.
UV Protection Coating: Protects the eyes from UV damage; ensuring 100% UV protection is crucial.
