Light rays enter the cornea first which is a transparent layer on top of the pupil. Cornea focuses the light rays properly so that a clear vision is created. The function of the iris or the coloured portion of the eye is to contract and dilate the eyes during dark and bright times. The ciliary body produce flatting and thickening of the lenses for distant and close vision. After light rays have reached Retina (light sensitive layer of the eye), the electric impulses travel through the optic nerve and reaches the brain where an image is created. The part of the brain that is responsible for vision is called the cerebral cortex and located at the back of the brain.
An interesting fact about our eyes is that the images are upside down when they reach the retina but the brain corrects the image so we see it as an upright image.
No comments:
Post a Comment