The all seeing eye

September 07, 2016

The all seeing eye

It’s no myth that without light we can see nothing, but how is it exactly that we able to see objects around us?!

Light reflects off an object and then enters the eye. The light then travels through several layers in the eye before reaching its final destination, or projecting an image.

Once reflected off an object the light touches the front layer of the eye which is made up tears to keep the eye moist.

Once through this curtain of moisture it reaches the window of the eye known as the Cornea. The clarity of the cornea helps to focus the light.

Directly behind the Cornea is more moisture known as aqueous humor . The light swiftly passes through the aqueous humor and then reaches the pupil, also known as the iris. The pupil may contract or dilate limiting or increasing the amount of light that gets deeper into the eye.

The light then travels through the lens. Similarly to the lens of a camera the lens of the eye focuses the light. The lens will focus the light for objects that are near or for objects that are further away.

This focused light then passes through more moisture in the centre of the eye known as the vitreous. The vitreous is surrounded by the retina. The retina is the inner lining at the back of the eye which is embedded with photo receptors. This inner lining is comparative to a movie screen or the film of a camera. The light has now reached its final destination.

The photoreceptors send electro-chemical signals which travel along nerve fibres to a nerve bundle which exits the back of the eye. This bundle is known as the optic nerve. The optic nerve sends these signals to the visual centre in the back of the brain

Light has now reflected from an object, entered the eye, been focused converted into electro-chemical signals, delivered to the brain and interpreted or “seen” as an image.

It’s important to ensure that all the layers of the eye are performing at their optimum. Pop into your nearest Vision Works and take advantage of our R90 Eye Test.


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