5 Questions
What is the function of the pupil?
To absorb and regulate light entering the eye
Why does the pupil appear black?
Because all light that enters is absorbed inside the eye
What is the average size of the pupil under normal light conditions?
4 mm
What can the diameter of the pupil change to in bright light?
3 mm
Which statement about the physiological reason for the change in pupil size is correct?
It is unknown
Study Notes
The Pupil
- The pupil is a small opening in the center of the iris that allows light to enter the lens.
- It appears black because it absorbs almost all the light that enters the eye.
- Under average light conditions, the pupil is approximately 4mm in diameter.
- The pupil can change in size, ranging from 3mm in diameter in bright light to 8mm in diameter in dim light.
- The physiological reason for this change in size is not fully understood.
Learn about the pupil, a small opening in the center of the iris where light enters the lens, and its ability to change size in response to light conditions.
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