For all people, pupil size has an important role in balancing incoming light with depth of field to optimize vision depending on the ambient light. The pupil even constricts when we accommodate to maximize vision for near work.
Young healthy patients have the best possible combination of a dynamic pupil with a large degree of accommodation, but this declines with age. We know that lens elasticity declines with age, and that causes a decrease in the accommodative amplitude, resulting in presbyopia. Pupil size also changes with time, and as we (Read more...)