Sunglasses such as Ray-Ban's Aviator and Wayfarer styles have become iconic fashion symbols and many people today wear sunglasses, regardless of where they are, what they are doing or whether it is day or night, purely as a fashion accessory.
But sunglasses are far more than simply a fashion item and here are five very good reasons for wearing sunglasses:
1. Sunglasses provide protect from harmful ultraviolet radiation.
Exposure to ultraviolet radiation from sunlight has been linked to the development of cataracts and age-related macular degeneration (a yellowing of the lens of the eye and a diminution of the central field of vision). A good pair of sunglasses can protect your eyes by blocking harmful ultraviolet rays and can also protect the delicate skin around the eyes and reduce the formation of wrinkles and premature aging.
2. Sunglasses reduce glare.
All surfaces reflect light to a greater or lesser degree and surfaces such as water, snow, and car windshields can cause very bright reflections which are both distracting and an interference to normal vision. Reflective glare can be especially dangerous when driving, riding a motorcycle, driving a boat or skiing.
Sunglasses reduce glare for safer, more comfortable vision. Polarized sunglasses are particularly effective at reducing glare from surface reflections.
3. Sunglasses protect your eyes from wind, dust and debris.
Sunglasses can provide a very effective wind barrier and prevent windblown particles from getting in your eyes and causing corneal abrasion. They can also reduce the evaporation of tears and help to keep the eyes moist and comfortable. If you wear contact lenses, sunglasses can also stop these from drying out.
Close-fitting, wraparound style sport sunglasses are especially effective when it comes to reducing dry eyes and eye injuries from windblown particles.
4. Sunglasses reduce headaches and eyestrain.
The pupil controls how much light reaches the light-sensitive retina at the back of the eye. In dim light the pupil opens to allow more light in while in bright light it constricts to keep too much light from striking the retina.
In very bright conditions, the pupil is often not able to constrict sufficiently to reduce light to a comfortable level and this, in turn, causes you to squint. If you are in strong light and squinting for any length of time muscle fatigue will soon set in and this, combined with lengthy constriction of the pupil, can lead to headaches and eyestrain.
Sunglasses reduce the amount of light reaching the eyes to a more comfortable level, eliminating the need for squinting and severe pupil constriction. This increases comfort and reduces the risk of headaches and eyestrain.
5. Sunglasses improve vision.
Our eyes require a certain range of ambient light for good vision and both too much light and too little light can be harmful. Excessive brightness causes glare, light-induced "bleaching" of the retina, and squinting - all of which can temporarily reduce visual clarity. On bright sunny days, sunglasses reduce the amount of light that reaches the retina to provide clear and comfortable vision.
There are of course many other reasons for wearing sunglasses but the five listed here are a good starting point and clearly demonstrate just how important sunglasses can be to the long-term health of one of the body's most important organs.
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