The eye is an amazing part of the human body and is responsible for one of the main senses in the body: vision.
The eye is a complex organ which receives information via the transmission of light through the cornea, pupil, lens and vitreous which stimulates the back of the eye (retina).
Obstruction of light transmission through any of these parts of the eye results in poor vision and sometimes even blindness.
When the transmission of light through the optical media of the eye is not perfectly aligned with the length of the eyeball, blurry vision can occur. This results in short sightedness (myopia), long sightedness (hyperopia) or astigmatism, amongst other debilitating vision problems.
A lot of the vision problems associated with the eye can be corrected with spectacles or contact lenses. Both of these add a layer of clear plastic in front of the eye to redirect live waves on to the retina. Careful measurement and crafting of glasses is required for clear vision.
Contact lenses sit on the front of the eye (the cornea) and bend the light accordingly to direct it to the retina.
Humans have two eyes and there are many advantages of this. One advantage is having two eyes means you have a spare eye. In the event of an injury to one eye, you can still manage most daily tasks with your remaining eye.
Two eyes working together also helps with fine depth perception. 3D vision is only possible with two working eyes. This skill is useful in many activities including driving and sports.
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