By Eyecare NG
Here is an outline of how the eye works for us to see.
As light rays from an object enter the eye, they pass through various parts of the eye including the cornea, the aqueous humour, the pupil, the lens, the vitreous humour, and then strike the retina. As the light rays pass through these structures, the following key processes take place;
- The cornea, the transparent structure in front of the eye, bends the rays.
- The pupil (controlled by the iris) determines the amount of bent rays that enter the eye
- The lens further bends the light rays to focus them on the retina
- At the retina, the photosensitive cells (photoreceptors), rods and cones convert light to electrical impulses.
- The electrical impulses generated on the retina are then carried by the optic nerve through various structures of the visual pathways to the visual processing centre in the brain known as the visual cortex.
- At the visual cortex, the electrical impulses are translated to the image we see.