A Comparative Analysis of the Ocular Refraction Assessment

This prospective semi-randomized crossover study assessed the agreement and reliability in the assessment of ocular refraction across four procedures. A standard subjective procedure was compared to objective assessments performed by three devices: the open and closed-field aberrometers Osiris (CSO, Italy), and the open field autorefractor WAM-5500 (Grand Seiko, Japan). A total of sixty-two participants, 33 presbyopes (54.7±8.2 years) and 29 young students (24.3±4.0 years) were enrolled. Objective measurements were taken at 5-minute intervals and randomly ordered. Subsequent subjective refraction concluded the examination. The ocular refraction resulted significantly different among the procedures. There was no agreement among the several procedures. The open field devices, which offer measurement of refraction in a more ecological scenario that assures normal binocular vision conditions in the real space (eliminating the vergence-accommodation conflict) showed good reliability.