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Study: Objective tests better for measuring accommodation
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Objective measures may be better than subjective means for evaluating accommodation, according to a recent study. Subjective means tend to overestimate true accommodative amplitudes, the study found.
Jon E. Wold and colleagues with the University of Houston, Texas, measured accommodation in the right eyes of 15 patients an average of 26 years of age.
Accommodation was stimulated with minus-lens-induced blur and pilocarpine 6%, and measured both subjectively and objectively using several techniques, including the focometer and minus-lens procedures and Hartinger coincidence refractometer.
According to the study, the two subjective methods of measuring accommodative amplitude agreed with each other, but differed from measurements made with objective methods. Accommodative amplitude was a mean of about 7 D when measured objectively.
When stimulated with pilocarpine, maximum accommodation was reached 33 minutes after administration. Patients with light irides also showed a stronger accommodative response than patients with dark irides.
The study was published in the Journal of Cataract and Refractive Surgery.