Constantly adjusting pupils?

I'm aware that the pupils constantly shift in accordance with changing light
levels at any one point as you move around or as light levels change, but
what would cause pupils that continue to dilate and contract over and over
in constant light? For example, in a bathroom with overhead lighting
looking directly into a mirror with no movement of the head, no shifting of
the eyes to look elsewhere, and nothing moving in the periphery or
background? My pupils will contract, then dilate, then repeat, they're not
going from max to minimum to max, sometimes it may dilate to point A and
contract to point Z and then dilate to poinc C and contract to point Y.

 

t-mark,

It is the triad between accommodation-convergence-pupilchanges.
The moment you try to look sharp in the mirror (short distance) at yours
pupils, they constrict due to the accommodation.

Jan (normally Dutch spoken)

 

Dear Mark,

This is just a normal physiological system at work.

The accommodation system does the same thing -- when
measured with an infrared optometer.

Partly it is "noise" in the system, from an
engineering perspective.

The "noise" in the accommodation system is about
0.6 diopters.

Best,

Otis
Engineer