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Minus lens method of measuring accommodative power proves most reliable

Graefes Arch Clin Exp Ophthalmol. 2009;247:121-127.

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Three methods of measuring amplitude of accommodation showed widely varying degrees of repeatability, a key factor in gauging significant accommodative changes. The methods are not interchangeable, the study authors said.

The study included 61 subjects age 18 years to 32 years (mean age, 19.74 years). Investigators compared amplitude of accommodation measurements made with the push-up, push-down and minus lens techniques. Tests were undertaken with distance correction. A lighted card with high black-on-white contrast was used as a near fixation target.

Amplitude of accommodation measurement using the minus lens method showed the highest repeatability, lowest mean difference (–0.08 D) and smallest margin of error (±2.52 D). The push-up method had a margin of error of ±4.76 D and the push-down method had a margin of error of ±4 D, the authors said.

"Agreement between the three techniques was poor, indicating that the methods are not interchangeable," the authors said.