The Human Eye is nothing short of a minor miracle, vision the most developed sense
Sight is the most complete and evolved among the five main senses. As the receptor, the eyeball or ‘ocular globe’ detects the light reflected from objects, and the rays begin a truly extraordinary journey.
Light initially passes through the cornea, which begins the light ray’s change of direction, performing about 70% of the ‘bending’. The lens, suspended on ciliary muscles, then focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye.
The retina receives the image using what are known as ‘rod and cone’ cells; these convert the light into electrical impulses which are carried by the optic nerve to the brain for processing. It is these rod and cone cells in the retina which allow conscious light perception and clear vision, including colour differentiation.
From the eye to the brain
The Retina transmits signals through the optic nerve that reach the opposite side of the brain. Images are processed in the visual cortex and combined from left and right eye to create a ‘stereo image’ and a perception of depth.