The colored muscle of the eye is the _.
options: a) lens b) pupil c) iris d) cone
The correct answer and explanation is:
The correct answer is: c) iris
The iris is the colored part of the eye. It is a thin, circular structure located between the cornea and the lens. Its primary function is to control the size of the pupil, which regulates the amount of light entering the eye. The color of the iris is determined by the amount and type of pigments, mainly melanin, present in the tissue. People with more melanin have darker eyes (e.g., brown), while those with less melanin tend to have lighter eyes (e.g., blue, green, or gray).
The iris is made up of two layers: an outer layer that contains pigment cells and an inner layer made up of smooth muscle fibers. These muscles control the dilation and constriction of the pupil in response to light. In bright light conditions, the iris constricts the pupil (pupillary constriction) to limit the amount of light entering the eye, which helps prevent damage to the retina. In dim light, the iris dilates the pupil (pupillary dilation) to allow more light into the eye, enhancing vision.
The iris works as part of the eye’s optical system to regulate how much light reaches the retina, which is crucial for clear vision. It plays an important role in adapting to various lighting conditions, helping individuals see better in both bright and low-light environments.
While the pupil is often confused with the iris, it is actually the black circular opening in the center of the iris through which light enters the eye. The lens, on the other hand, focuses light on the retina, and the cone cells are responsible for color vision, located in the retina.