負荷調節検査装置による正常眼の負荷調節波形の解析

Dynamics of accommodation evaluated by an automated accommodometer in normal persons

要約　目的：正常者での負荷調節波形の報告。

対象と方法：負荷調節時に4D以上の調節反応がある正常者217例217眼を対象とした。年齢は6〜30歳（平均13.3歳）で，男性80例，女性137例である。屈折は，遠視7％，正視12％，−3Dまでの軽度近視45％，−6Dまでの中等度近視31％，−6D以上の強度近視5％であった。負荷調節検査装置を用い，等速度で動く指標で調節負荷を行い，屈折度を時間の二次関数に近似して解析した。

結果：負荷調節波形の二次関数に対する重相関係数は0.90±0.09で，二次・一次・定数項のすべての項目に対し有意に相関し（p＜0.05），正常眼での負荷調節波形は放物線に近似した。217例中211例（97％）では，放物線の軸は最も近方負荷のタイミングよりも正に偏位し，その偏位量は平均2.77±1.99秒であった。

結論：正常眼での負荷調節波形は，二次関数に近似すると放物線に近かった。

Abstract　Purpose：To report dynamics of accommodation evaluated by an accommodometer in normal persons.

Cases and Method：This study was made on 217 eyes of 217 healthy persons show responded by 4 diopters or over of accommodation. The series comprised 80 males and 137 females. The age ranged from 6 to 30 years, average 13.3 years. State of refraction included hyperopia 7％, emmetropia 12％, light myopia of less than −3 diopters 45％, moderate myopia between −3 and −6 diopters 31％, and high myopia 5％. Change in refraction was documented as each case looked at an equally moving targets. The observed changes were plotted as approximating curve as function of time.

Results：Multiple correlation coefficient averaged 0.90±0.09. It showed significant correlation with first-order, second-order and constant（p＜0.05 each）. In 211 out of 217 cases（97％）, the symmetrical axis of the parabola was dislocated from the targets. The degree of dislocation averaged 2.77±1.99 second.

Conclusion：Dynamics of accommodation during accommodative stimulation approximated a parabola curve.