The Lens On The Background Of The Keyboard In A Dark Room Stock Image

The lens in the eye focuses this expanding cone back into a contracting one that comes to a point on the retina corresponding to the position of the pixel `out there on the screen`. Focusing is achieved by a muscle around the eye`s flexible lens, the cilliary muscle, which squeezes the lens into a more spherical shape to cause rays entering the eye to bend more, bringing objects closer to the eye into focus, or by the cillary muscle relaxing, allowing the lens to stretch back to a flatter shape, to bend rays less, bringing objects. ... It is possible that in a very dark room that a mostly dark background with lighter text on a display might be easier on the eyes but this would imply a kind of troglodytish existence that is likely not healthy for human beings