The eye captures the image and the eye sorts everything out
The perception of vision is a complex phenomenon. What we can see depends on many factors including how the outside world is illuminated, how that light from the outside world gets transmitted into the eye and how then those signals from the eye are sent via electrical signals along nerves to the brains visual centres to interpret the images illuminated of the outside world.
The eye is primarily responsible for capturing light from the outside world and processing this into an electrical signal for the brain to interpret. The electrical signals are therefore not processed in the eye, but through the optic nerves into the brain centre responsible for vision processing.
We can consider the basic steps of visual perception as follows:
The most common cause of visual impairment world wide are a group of disorders called ‘refractive errors’, resulting in blurred images. The main refractive errors are myopia (nearsightedness), hyperopia (farsightedness), Presbyopia (loss of near vision with age) and astigmatism.