How does the iris of the eye control the pupil?外教提出的问题,下周就要说了,要英文的,语法准!

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How does the iris of the eye control the pupil?外教提出的问题,下周就要说了,要英文的,语法准!
How does the iris of the eye control the pupil?
外教提出的问题,下周就要说了,要英文的,语法准!

How does the iris of the eye control the pupil?外教提出的问题,下周就要说了,要英文的,语法准!
The iris (plural: irides, in this context) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupils and the amount of light reaching the pupil. "Eye color" is the color of the iris, which can be green, blue, or brown. In some cases it can be hazel (light brown). In response to the amount of light entering the eye, muscles attached to the iris expand or contract the aperture at the center of the iris, known as the pupil. The larger the pupil, the more light can enter.