⚙️ how
How do the pupils change size in different light?
Human BodyEyes
Quick Answer
The iris muscles change pupil size to control how much light enters the eye. Pupils usually get smaller in bright light and larger in darkness.
The Full Story
The pupil is the opening in the center of the iris, and its size is controlled by two sets of muscles. Circular muscles constrict the pupil in bright light, while radial muscles dilate it in dim light. This reflex protects the retina from too much light and helps the eye see better in changing conditions. The response can happen in a fraction of a second and is part of the autonomic nervous system. Pupils also change size with focus, emotion, and some medicines.
Key Facts
1.The iris controls pupil size
2.Pupils constrict in bright light and dilate in darkness
3.The response is part of the autonomic nervous system
YouTube Angle
Suggested video title for this topic:
"Why your eyes act like living camera lenses"