Validity Of Phoropter-Based Accomodative Facility.

Background: It is of utmost importance for a busy primary care optometric practice to be
as efficient as possible. It is just as important to be sure that efficient procedures used in
a practice produce valid results. The purpose of this report is to provide data that shows
how well Phoropter-Based Accommodative Facility Testing identifies symptomatic patients. Normative data for Phoropter-Based Accommodative Facility Testing has been established on asymptomatic patients. Methods: Forty-two subjects aged 8-35 years were evaluated using Phoropter-Based Accommodative Facility. Prior to testing, subjects completed surveys to determine if the subjects had symptoms that are commonly found with accommodative and binocular vision conditions. The near-point PD was put into place and the target that was used was a line ofletters 1-2 lines larger than threshold at 40 centimeters. Data was gathered binocularly first using +/-0.75D and then using +/-1.50D facility for all subjects. The +/-0.75D testing protocol was -0.75D over the best corrected visual acuity and the + I.50D retinoscopy auxiliary lens was used to facilitate the test. The +/-1.50D testing protocol was -1.50D over the best corrected visual acuity and the large +3.00D strong sphere knob was used to facilitate the test. The facilitating lenses were put in and out of position and the patient reported if and when the target became clear. The procedure was performed using the same methods of testing and the same subject criterion as previously used in normative data studies. The data from the subjects was analyzed and compared to normative data. Results: Asymptomatic patients produced results of a mean of 10.4 cycles per minute (cpm). Symptomatic patients