Polarised lenses are a popular choice for sunglasses due to their ability to reduce glare and enhance visual clarity. But how do they work? Let’s dive into the science behind polarised lenses.
When light travels, it moves in all directions, and when it hits a flat surface like water, roads, or snow, it can become horizontally polarised, creating intense glare. They are designed to block this horizontal light, allowing only vertical light to pass through. This selective filtering effectively reduces glare, enhancing your visual comfort and improving contrast and clarity.
Polarised lenses are made using a special chemical film that is either applied to the lens or embedded within the lens material. This film contains molecules that are aligned to create a microscopic filter. When light enters the lens, the aligned molecules block horizontal light waves, while vertical light waves are allowed to pass through. As a result, glare from surfaces like water, roads, and snow is minimized.
Benefits of polarised lenses:
- Glare Reduction: Polarised lenses significantly reduce glare, making them ideal for outdoor activities like driving, fishing, skiing, and boating. Glare from sunlight reflecting off surfaces can strain your eyes and affect your vision, and the lenses help alleviate this issue.
- Improved Visual Clarity: By filtering out glare, polarised lenses enhance visual clarity and contrast. This is especially important in bright conditions where glare can distort details and make objects harder to see.
- UV Protection: Many of the lenses come with built-in UV protection, blocking harmful UVA and UVB rays. This helps protect your eyes from the sun’s damaging effects, reducing the risk of cataracts and other eye conditions.
- Reduced Eye Strain: Without the need to squint or strain to see clearly, your eyes are more relaxed when wearing polarised lenses. This reduces eye fatigue, making outdoor activities more enjoyable.
- Color Perception: Polarised lenses maintain natural color perception, unlike some other types of lenses that can alter colors. This means you can enjoy vibrant, true-to-life colors while still benefiting from glare reduction.
While polarised lenses offer many advantages, it’s important to note that they might not be suitable for all situations. They can interfere with the visibility of certain digital screens, such as those found in airplanes and some cars, which use polarisation to reduce glare. Additionally, pilots or skiers who rely on seeing glare for specific purposes might not find these lenses beneficial.
In conclusion, polarised lenses work by selectively filtering out horizontal light waves, reducing glare and improving visual clarity. These lenses are a great choice for outdoor enthusiasts and anyone looking to enhance their comfort and vision in bright conditions. Always consult with an eyewear professional to determine if polarised lenses are the right choice for your specific needs.