Comparison of objective accommodation in phakic and pseudophakic eyes between age groups

Abstract

PurposeTo compare objective accommodation of phakic and pseudophakic eyes between two different age groups.MethodsEighty-three eyes (83 participants aged ≥\u200940\xa0years) with a visual acuity of 20/25 or better, and refractive error < spherical −\u20091.0\xa0diopters (D) and cylindrical 1.0\xa0D, were included. Forty-four patients had undergone phacoemulsification and monofocal intraocular lens implantation and were examined 6\xa0months post-surgery. Participants were divided into groups 1 (pseudophakic, age <\u200960\xa0years), 2 (pseudophakic, ≥\u200960\xa0years), 3 (phakic, <\u200960\xa0years), and 4 (phakic, ≥\u200960\xa0years). Objective accommodation and pupil diameter to 2.0- and 3.0-D stimuli were measured with a binocular open-field autorefractor.ResultsThe mean objective accommodation was 0.29\u2009±\u20090.47\xa0D, 0.01\u2009±\u20090.21\xa0D, 1.00\u2009±\u20090.88\xa0D, and 0.01\u2009±\u20090.13 to a 2.0-D stimulus, and 0.26\u2009±\u20090.51\xa0D, −\u20090.06\u2009±\u20090.21\xa0D, 1.42\u2009±\u20091.21\xa0D, and −\u20090.06\u2009±\u20090.21 to a 3.0-D stimulus in groups 1, 2, 3, and 4, respectively. For both stimuli, the values in group 1 exceeded those in groups 2 and 4, and were smaller than those in group 3, while the values in group 3 exceeded those in groups 2 and 4. The mean pupillary diameter was −\u20090.5\u2009±\u20090.8\xa0mm, −\u20090.3\u2009±\u20090.8\xa0mm, −\u20090.6\u2009±\u20090.5\xa0mm, and −\u20090.6\u2009±\u20090.9\xa0mm to a 2.0-D stimulus, and −\u20090.6\u2009±\u20090.8\xa0mm, −\u20090.6\u2009±\u20090.8\xa0mm, −\u20090.9\u2009±\u20090.5\xa0mm, and −\u20091.0\u2009±\u20091.1\xa0mm to a 3.0-D stimulus in groups 1, 2, 3, and 4, respectively. There was significant correlation between objective accommodation and changes of pupil size for both stimuli.ConclusionAge seems to play a role in objective accommodation among relatively young pseudophakic patients.