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Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
Irises help to protect the retinas of our eyes from damage by bright light by contracting the pupil to accommodate the right amount of light inside the eye.
Explanation
Iris is the coloured part of our eye (typically brown or blue), which is made up of pigment and consists of two sets of smooth muscles that control the diameter and shape of the pupil, and they are:
1. Sphincter muscle - These muscles are in the shape of a ring located at the edge of the pupil and cause the iris to constrict or contract, reducing the size of the pupil.
If the light is bright, the size of the Pupil gets reduced (smaller), so that less amount of light can enter the eyes.
2. Dilator muscle - These muscles are in the radial shape located radially throughout the iris, like spokes on a wheel, and cause the iris to dilates or stretch, increasing the size of the pupil.
If the light is dim, the size of the Pupil gets increases (larger), so that more amount of light can enter the eyes.
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