The opening in the center of the iris of the eye for the transmission of light to the retina.
The central opening in the iris of the eye, through which light enters the eye.
Hole at the front of the eye through which light enters the eye.
Circular opening in the center of the iris, lying behind the anterior chamber and cornea and in front of the lens, through which light passes to the lens and retina. The diameter of the pupil changes with muscle action of the iris in response to changes in light and other stimulation.
The dark center of the iris that allows light rays to enter the eye.
The opening in the center of the eye through which light passes. The iris, the colored area encircling the pupil, contains muscles that adjust the size of the pupil in response to the amount of light and focusing needed. The iris opens (dilates) the pupil to allow more light to enter or to focus on far objects. The pupil contracts to restrict light coming in and to focus on near objects.
The circular opening in the center of the iris, through which light passes into lens of the eye.
The contractile opening at the center of the iris of the eye. It is constricted when exposed to strong light and when the focus is on a near object; is dilated in the dark and when the focus is on a distant object. Average diameter is 4 to 5 mm. The pupils should be equal.
The opening in the center of the iris that relaxes and contracts to change the amount of light entering the eye.
The central region of the iris, resembling a black circle, is known as the pupil. Contrary to its appearance, the pupil is an aperture that allows the passage of light into the eye.
The central aperture within the iris. It narrows in bright light and widens in dim lighting conditions.
The aperture within the iris of the eye that permits the passage of light. Typically, it expands or contracts in response to the brightness of the surroundings, though various factors such as medications, emotions, and other influences can influence its size.