My pupils are SO SMALL almost ALL the time... and I don't understand why, it could be pitch dark and they could still be small haha.
I can do voluntary pupil dilation and I can make them HUGE, but that's only if I do it myself.
I have blue eyes, do you notice your pupils are mostly small too?
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The pupil is an aperture in the iris that is controlled by two sets of smooth muscle, involuntary muscle. From what I understand the iris sphincter muscle which is the iris itself is controlled by a parasympathetic system fibers of the III cranial nerve. When the light is too bright It contracts. then we got the iris dilator muscle which of course dilates the eye. This muscles is innervated by the sympathetic nervous system (sns). Now the SNS is a bit hard to explain. Just by telling you its starts a little below your neck and ends almost by your butt I'm sure throws you off. Well all of this is involuntary. I find it fascinating you can actually dilate your eye.
alright hope I haven’t lost you. Then we got something called miosis which is excessive constriction of the eye. equal or <2mm. the opposite of this being mydriasis. Miosis, not to be confused with meioisis lol, is normal in excessive light situations but it can also be caused by drugs you might be on or it could be pathological. most of these drugs are antipsychotics and antidepresants and I hope you're not on them I doubt its pathological because then we’re dealing with something like oculosympathetic pasly and a clear sign of this is ptosis (lazy upper eye lid.) I'm sure your doctor would of caught a red flag like this.
in essence, I'm guessing you just “think” your pupils are always small when in fact their just normal.