Eyes we have the structure such as a camera (or cameras that have a structure like our eyes?)
So there are sections that receive light which is called cornea; There diaphragm to limit the amount of incoming light, called the pupil; have set the lens focus the light from the entrance; also have the modifier signal light into a signal understood by the brain so that we see, called the retina . Thus, we know that the retina is a very important part in the process to see something human. Retina without means no signal information is sent to the brain, so that we can not see.
Pupil will be over when our eyes are a light overcharging, and will expand when the amount of light received cornea is reduced. Thus protected from the retina into a burn hazard due to excessive light and still work well when less light. With the use of sunglasses, the pupil will be automatically expand as the number of the incoming light is reduced because some light on hold by the sunglasses. But besides the visible light, also have a light that does not appear that it is more dangerous from the visible light.
Light is infrared and ultraviolet.
The problem is "NOT ALL sunglasses can infrared and Ultraviolet"
In some low-quality glasses, ultraviolet rays and infrared rays are so missed, so that the retina (the pupil is partly due to increase in visible light by sunglasses) will be exposed to infrared and ultraviolet excessive. IR can result in excessive burnt his eyes and retina excessive ultraviolet can trigger the occurrence of cancer.
So, make sure your sunglasses also protect you against infrared and (especially) ultraviolet.
And although the use of Sunglasses, not the usual right up to sun (or the reflection of sun rays) directly.
by: Ewnporce
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