非接触眼軸長測定装置で測定した１年間の眼軸長変化の検討

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  • Changes in Axial Length over One Year as Measured Using a Non-Contact Laser Interference Biometry

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The present study was undertaken to compare changes in axial length as measured using a non-contact laser interference biometry with changes of ocular refraction measured simultaneously for one year.<br>The subjects of this study were 235 outpatients visiting our hospital, complaining of reduced visual acuity or refractive errors. Their ages ranged from 3 to 18 years. After obtaining consent from individual patients or their guardians, axial length of each patient was measured 3-5 times, using a non-contact laser interference biometry, and the mean of the 3-5 measurements was calculated. The measurement was repeated one year or more later, as a rule. The magnitude of change in axial length was corrected for the number of days between the two sessions of measurement and expressed as a change over one year (365 days). Refraction was measured simultaneously without use of accommodation paralysis. The magnitude of change in axial length during one year, as measured with a non-contact laser interference biometry, ranged from -0.11 to 0.94mm (mean 0.27mm, standard deviation 0.18mm). The increase in axial length tended to be greater among children between the years of elementary school. The increase of axial length was greater in patients with a larger baseline axial length between the years of elementary school. In addition, the increase of axial length was greater in patients with more intense myopia as rated by the refraction between the years of elementary school. Patients without a change in refraction also showed an increase of axial length, but patients of myopia showing a change in refraction t underwent a greater change of axial length.

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