Vision, the human visual system, is a complex interplay between various components of the eye, including the cornea, pupil, lens, iris, retina, and optic nerve. It collaborates to capture, focus, and convert light into electrical signals that are transmitted to the brain for visual processing and interpretation.
- Vision begins when light emitted or reflected by an object or scene enters our eyes through the cornea, pupil, and lens.
- The cornea and the lens work together to concentrate and focus light onto the retina, which is the photosensitive layer of cells at the back of the eyeball.
- The iris, located between the cornea and the lens, regulates the amount of light reaching the retina. It also determines eye colour and controls the size of the pupil.
- The retina plays a vital role in converting differences in the wavelength and brightness of incoming light into electrical signals.
- The optic nerve, which exits at the back of the eye, carries these signals to the visual processing areas of the brain.