The iris is a circular, pigmented membrane that provides the eye its color and the opening in the center is the pupil of the eye.
The iris is made up of muscular fibers that control the amount of light entering the pupil so that you can see clearly. The iris accomplishes this task by making the pupil smaller in bright light and larger in dim light.
It's important for adults to have eye exams on a regular basis to check for problems. Regular eye exams are critical for detecting:
Age-related macular degeneration (AMD)
But everyone needs regular eye exams. This is particularly important if you have risk factors or a family history of eye problems. Children need their vision checked at 6 months, 3 years, and before first grade. These exams should be done during preventative pediatrician visits...