Presbyopic Refraction: Manifest vs. Mydriatic.

OBJECTIVE: Ascertain whether or not presbyopes demonstrate any clinically significant refractive change with mydriasis.
METHOD: Direct comparison between manifest subjective refraction and subjective refraction obtained after inducing mydriasis (tropicamide alone or in combination with
phenylephrine), using spherical equivalents.
POPULATION: Subjects ranged in age from 42 to 68, with mean age 61 and median 63. Total number of subjects was 20 with 18 males. 75% of the subjects manifest refractive errors with spherical-equivalents greater than or equal to zero.