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A member asked:
How are images formed in the retina by adjustment of the pupil?
3 doctors weighed in across 2 answers
Amount of light: Pupil size controls the amount of light entering the eye and does not affect the image per se. The image is formed due to the curvature of the cornea and the refractive indices of cornea and the lens. The lens does adjust its focal length to sharpen the image.
Answered 10/4/2015
2.2k views
TwoCamerasPriceOfOne: If the pupil can't see well from the back of class, he'll get closer to the front. Also, if there isn't much light in the room, the pupils in his eyes will widen to allow more light to reach the retina (just like a camera's aperture) & when he goes outside into the sun, they'll narrow to prevent too much light from entering the eye. That's why, when you enter a dark theater,it takes time to adjust
Answered 10/4/2015
2.2k views
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