Cognitive behavioral therapy (CBT) is a type of psychotherapeutic treatment that helps patients understand the thoughts and feelings that influence behaviors. CBT is commonly used to treat a wide range of disorders, including phobias, addictions, depression, and anxiety.
The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening. In bright light, the iris closes (or constricts) and makes the pupil opening smaller to restrict the amount of light that enters your eye. The iris in bright light. In dim light, the iris opens (or dilates) and makes the pupil opening larger to increase the amount of light that enters your eye: The iris in dim light. In addition, it is the iris that determines your eye color.
In man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retina. 2. (often plural) the ability to see; sense of vision: weak eyes. 3. (Anatomy) the visible external part of an eye, often including the area around it: heavy-lidded eyes; piercing eyes.n man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retina. 2. (often plural) the ability to see; sense of vision: weak eyes. 3. (Anatomy) the visible external part of an eye, often including the area around it: heavy-lidded eyes; piercing eyes.