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Influence of Accommodative Lag upon the Far-Gradient Measurement of Accommodative Convergence to Accommodation Ratio in Strabismic Patients

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Abstract

Purpose

To determine the influence of the lag of accommodation (LOA) on the accommodative convergence to accommodation (AC/A) ratio measured by the far-gradient method in strabismic patients.

Methods

The AC/A ratio was measured with a distance target viewed with and without −3.00 diopter (D) addition lenses in 63 patients with different types of strabismus (age range, 7–34 years; range of strabismic angle, −60 to +40 prism diopters; refractive error range, −7.33 to +6.63 D). The LOA for the same lens was measured with an open-view-type autorefractometer. The stimulus AC/A ratio and the AC/A ratio adjusted by the individually measured LOA (adjusted AC/A ratio) were compared.

Results

The mean ± SD of the LOA to the −3.00 D lenses was 1.06 ± 0.43 D. The mean adjusted AC/A ratio was 41% greater than the stimulus AC/A ratio. The LOA differed widely among patients (0.13 to 2.14 D), and a large LOA tended to appear in myopic or young patients.

Conclusions

The AC/A ratio obtained using the conventional far-gradient method is significantly biased by the LOA, and thus does not always represent the actual relationship between accommodation and vergence control systems. Jpn J Ophthalmol 2006;50:438–442 © Japanese Ophthalmological Society 2006

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Authors and Affiliations

  1. Department of Ophthalmology, Okayama University, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan

    Manabu Miyata, Satoshi Hasebe & Hiroshi Ohtsuki

Authors
  1. Manabu Miyata
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  2. Satoshi Hasebe
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  3. Hiroshi Ohtsuki
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Correspondence to Satoshi Hasebe.

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Miyata, M., Hasebe, S. & Ohtsuki, H. Influence of Accommodative Lag upon the Far-Gradient Measurement of Accommodative Convergence to Accommodation Ratio in Strabismic Patients. Jpn J Ophthalmol 50, 438–442 (2006). https://doi.org/10.1007/s10384-006-0353-x

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  • DOI: https://doi.org/10.1007/s10384-006-0353-x

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