What study methods were used?
Study investigators began by doing complete vision examinations on our subjects, who ranged in age from 19 to 30 years old. Subjects completed several tasks on the computer that were calculated to assess the effects of refractive error (or visual accuracy) on their productivity. Using a PRIO vision tester, a device that simulates one’s vision at the computer and is used by many eye doctors who specialize in computer vision care, the study assessed the subjects’ computer vision using both corrected and uncorrected lenses. The lenses for each subject were then randomly assigned, without the subjects or technicians knowing which lenses were being used. This is what is meant by a double-masked, placebo-controlled, scientific protocol.
