👉 The term "eyesight" refers to the ability of the human eye to perceive and interpret light, which is essential for vision. The visual system in the eye consists of two main parts: the retina, which contains the photoreceptor cells responsible for converting light into electrical signals, and the optic nerve, which carries these signals to the brain for interpretation. The eyesight can be affected by various factors, including age, genetics, and environmental exposures such as prolonged exposure to sunlight or certain medications.