Now a days people of all age groups are fond of sunglasses. The darkened glasses are not the actual sunglasses. Sunglasses should protect your eye from harmful UV rays and relieves the discomfort caused due to exposure to sunrays. Sunglasses should have the capacity to ban 99-100% of UV rays from entering your eyes. UV rays have the ability to enter in the eye and cause retinal damage. Once the retina is damaged, there is no cure and this result in partial or complete loss of vision.
UV rays are also responsible for causing cataract and skin cancer due to prolonged exposure to UV rays. You should prefer glasses with proper UV protection when compared to darkened glasses without UV protection. Darkened glasses allow the pupil to become bigger and allow more harmful UV rays to enter into your eyes.
Sunglasses with UV protection are costly when compared to darkened glasses. While buying the sunglasses you need to keep two things in mind, first it should have 99-100 % UV protections. The second thing is that, it should be bigger in size and a wrap around kind of fashion which covers your eyes completely. Bigger glasses inhibit the sunrays to enter through the periphery into your eyes.