Everyone should own a pair of quality polarized sunglasses. Polarized lenses do what no other lens or lens treatment can - block glare. In doing so, polarized lenses can enhance visual acuity, colour contrast and visual comfort, as well as block 100% of harmful UVA and UVB light.
We’ve all experienced glare in our daily lives… perhaps a day at the beach, driving in a car with the sun reflecting off the dashboard, roadway or on a boat with the sun illuminating the surface of the water. This intensely bright white glare is annoying and uncomfortable on the eyes, and it can become dangerous, as in the case when driving a vehicle.
Ordinary tinted sunglass lenses only cut down on the ambient light that reaches the eye, or, light transmittance. By their very nature, they cannot block glare. Polarized sunglasses do both!
When light hits a surface, typically light waves are absorbed and or reflected in random directions. Some light travels in horizontal waves, while others travel in vertical waves.
However, if light hits a flat reflective surface at just the right angle (such as water, road surface or buildings), some of the light waves bounce off the surface resulting in reflected glare or partially ‘polarized’ light that interfere with your vision.
Polarized lenses are made by laminating a special sheet with many invisible vertical filters inside a plastic lens. This filter layer only allows light waves are travelling in a vertical direction to pass through the lens and enter the wearer's eyes. Glare is eliminated because the scattered intense horizontal light waves cannot bypass the vertical filter.
Like Venetian blinds, the iodine crystals contained within the polarized filter in the lens block out horizontally polarized light waves, letting only (non-polarized) vertical light waves reach the eye. The person looking through the lens can still see clearly because the filter reduces the brightness and glare of light. This results in comfortable vision with no glare.
There are a few circumstances where polarized lenses are not appropriate, such as night driving, piloting an airplane and certain snow sports. Certain older generation LCD screens on GPS’s may also not work efficiently. Most people will, however, find polarized lenses immensely helpful in improving the clarity and quality of their daytime vision in bright sunny conditions.
Love your eyes with Vision Works and Polarized lenses.