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Questions and Answers
What is the function of the pupil?
What is the function of the pupil?
- To absorb and regulate light entering the eye (correct)
- To transmit the gaze
- To reflect images
- To produce tears
Why does the pupil appear black?
Why does the pupil appear black?
- Because it is covered by the retina
- Because all light that enters is absorbed inside the eye (correct)
- Because the iris has no color
- Because it reflects no light
What is the average size of the pupil under normal light conditions?
What is the average size of the pupil under normal light conditions?
- 2 mm
- 6 mm
- 4 mm (correct)
- 8 mm
What can the diameter of the pupil change to in bright light?
What can the diameter of the pupil change to in bright light?
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Which statement about the physiological reason for the change in pupil size is correct?
Which statement about the physiological reason for the change in pupil size is correct?
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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.
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Description
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.
