See #4. Is the pupil dilating in low light the cause of reduced acuity?
“See #4. Is the pupil dilating in low light the cause of reduced acuity?”
No, the pupil does not dilate enough in scotopic (dim light) conditions to cause blur except perhaps in very young children who have very large, still highly reactive pupils.
This was the inaccuracy I mentioned in my original post. In and of itself, reading in dim illumination will not elicit consequent distance blur. I think they are confusing the effects of early presbyopia (loss of near vision beginning in the early 40’s). For presbyopic patients, prolonged nearpoint activity in WHATEVER lighting condition will result in a slow refocus to full distance vision. This is due to a simple thickening, with resultant stiffening of the crystalline lens with age and is independent of lighting conditions, photopic or scotopic.