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i think you could easily check the size of a dark adapted pupil with a red torch and an opticians P.D. rule (pupilliary distance)
i have used this rule every day of my life for thirty years being a dispensing optician
you could easily measure it to a tolerance of at least a quarter of a millimetre no fanct tools required and extremely accurate
during daylight hours on occasions during spectacle "marking up" i have noticed some pupils dilated more than others
this may be the same at full dark adaption and you could then observe with the largest pupil
on another similar subject i myself used to observe with my right eye only until recently when an subsequent eye test revealed that my right eyes astigmatism has increased from a half dioptre to a full dioptre
so what did i do? i observe now with my left eye which is only a quarter diotre of astigmatism! blacker skys and more pinpoint stars
the brain admittedly decided it was all wrong but it got over it!
pat
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