The virtual assistant in iOS can do all kinds of stuff, of course. But here are the 16 things we think everyone should try at least once.
In most vertebrates and some molluscs, the eye works by allowing light to enter and project onto a light-sensitive panel of cells, known as the retina, at the rear of the eye. The cone cells (for colour) and the rod cells (for low-light contrasts) in the retina detect and convert light into neural signals for vision.
It is surrounded by the iris, which is the colored part  of your eye.   The pupil allows light to enter the eye. â¦Light  enters through the pupil, passes through the lens, and is focused  onto the retina. The retina is the back part of the eye that has  the receptors that interpret what you see.