Polarization refers to a specific technology used in sunglasses and other optical devices to reduce glare from surfaces such as water, snow, and roads. Let’s check how they are defined-
1.Defining Polarized Sunglasses:
Polarized sunglasses are defined by their ability to reduce glare through polarizing filters embedded in the lenses.
They must meet specific standards for polarization efficiency, typically blocking 99% or more of horizontally polarized light.
Polarized sunglasses should also provide adequate UV protection and meet impact resistance requirements depending on their intended use (e.g., sports, everyday wear).
2.Features of Polarized Sunglasses:
Glare Reduction: Polarized lenses significantly reduce glare from surfaces such as water, snow, and roads, making them ideal for activities like fishing, skiing, and driving.
Enhanced Clarity: By reducing glare, polarized sunglasses improve visual comfort and clarity, allowing wearers to see details more clearly.
UV Protection: Many polarized lenses also offer UV protection to shield the eyes from harmful ultraviolet rays.
3.Standards for Polarized Sunglasses:
American National Standards Institute (ANSI): ANSI Z80.3 is a standard that specifies requirements for sunglass lenses, including polarization efficiency, UV protection, and impact resistance.
European Union (CE Marking): Sunglasses sold in Europe must comply with EN ISO 12312-1, which includes requirements for polarization efficiency and UV protection.
International Standards: ISO 12312-1 provides guidelines for sunglasses, including polarization standards, to ensure consistent quality and performance globally.
4.Polarization Technology:
Polarized sunglasses are designed with lenses that contain a special filter to block horizontally polarized light. This filter selectively blocks glare reflected from flat surfaces, improving visibility and reducing eye strain.
Glare occurs when light reflects off a surface, becoming polarized horizontally. Polarized lenses effectively neutralize this glare, providing clearer vision and enhanced contrast.
In summary, polarized sunglasses utilize specialized technology to reduce glare and enhance visual clarity. They adhere to established standards for polarization efficiency, UV protection, and impact resistance to ensure quality and performance. Choosing polarized sunglasses can significantly improve comfort and safety, especially in bright outdoor conditions with reflective surfaces.