The pupils' size change in response to the degree of light that is entering the. Dilation depends less on the distance of the object from the eye and more on how many light rays are in the field of vision.
It dilates
you see with your pupil.
lens
An Argyll Robertson pupil is a bilateral small pupil of the eye which reduces in size when the patient focuses on a near object but does not constrict when exposed to bright light - a sign of neurosyphilis.
If there is a problem with the muscles of the pupil then it will not regulate light into the eye correctly.
There are many things that can dilate the pupil of the eye. First of all, light plays a huge factor. Also, if there are unknown, alien substances in your body, such as drugs, that is also a pupil dilator. Also, if you have recently suffered a concussion, your pupils might be dilated for a while. Pupils also dilate when focusing on different planes of vision, as well as different distances.
the pupil focuses the light from the source to the eye and the darker it is, the more it has to focus.
They die.
it gets bigger
Nothing. AFTER the light is detected and calibrated, the pupil may change size.
If the pupil of the eye did not work, than your eye could not regulate light entering it.
rods cones corea pupil
It is well known as the pupil - a dark circular opening in the center of the iris of the eye, varying in size to regulate the amount of light reaching the retina, so that you can have a visual at the things you look at.