Vision is our most "dominant" sense. First, light enters the eye; then, organs in the eye perform transduction, turning visual signals into neural impulses. Then, neural impulses are transported to the Occipital Lobe's Visual Cortex and interpreted.
Human Eye -Iris Iris of the eye. Coloured scanning electron micrograph (SEM) of the inner surfaces of the iris and adjoining structures in the human eye. At far right (blue) is the edge of the pupil, the hole that allows light into the eye.
It's a very small thing starting with the letter 'd' but it means medical textbooks will need to be re-written. The Dua Layer, a previously undetected component of the eye, has been spotted for the first time.