Vision An eye is an organ of vision that detects light. Different kinds of light-sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. Vision Research is a journal devoted to the functional aspects of human, vertebrate and invertebrate vision and publishes experimental and observational studies, reviews, and theoretical and computational analyses. Vision Research also publishes clinical studies relevant to normal visual function and basic research relevant to visual dysfunction or its clinical investigation. Functional aspects of vision is interpreted broadly, ranging from molecular and cellular function to perception and behavior.
- Many animals, including some mammals, birds, reptiles and fish, have two eyes which may be placed on the same plane to be interpreted as a single three-dimensional “image” (binocular vision), as in humans; or on different planes producing two separate “images” (monocular vision), such as in rabbits and chameleons.
- The eye is the main organ of the visual system, it gets images seen by the person and turns them into an electric signal which is carried along the optic nerve to the brain.
- The iris is a round membrane, perforated in the middle by the pupil.
It forms the cultured part of the eye where the color is determined by the thickness of the epithelium.
- The iris is light when the epithelium is thin, and dark when it is thick.
The contraction or distension of the iris is a physiological reflex of adaptation to the light.
