Glare and halos which may cause night time symptoms especially in patients with larger pupil diameters.

The participants were also monitored in other areas such as their heart rate, pupil diameter, and stress measures by collection of saliva throughout the experiment.

Pupillometry is the measurement of pupil diameter in psychology.

Lambert measured his own pupil diameter by viewing it in a mirror.

Between these extremes is the pupil diameter that is generally best for visual acuity in normal, healthy eyes; this tends to be around 3 or 4 mm.

Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter.

At a pupil diameter of 3 mm, the spherical aberration is greatly reduced, resulting in an improved resolution of approximately 1.7 arcminutes per line pair.

The effect of spherical aberration increases as the fourth power of the pupil diameter.

Doubling pupil diameter increases spherical aberration 16 times.

However these polynomials have the disadvantage that their coefficients are only valid for the particular pupil diameter for which they are determined.