眼疾患患者に対する暗所視支援眼鏡MW-10 HiKARIの有用性についての自覚的印象による評価

Subjective evaluation on the usefulness of MW-10HiKARI in patients with ocular diseases

要約　目的：眼疾患のある患者に対して，視覚補装具であるHOYA社製の暗所視支援眼鏡MW-10HiKARI（以下，MW-10）の有用性について自覚的印象による評価を行った。

対象と方法：視野狭窄や夜盲，視力低下がある患者25例（男性14例，女性11例）49眼，年齢（平均値±標準偏差）71±12歳（31〜88歳）に対し，MW-10に通常レンズと広角レンズをそれぞれ装着して院内の風景の観察や歩行をしてもらい，使用感について5段階で評価，長所，短所を自由形式で回答してもらった。使用アンケート評価は，①全症例での評価，②網膜色素変性症例での評価，③平均年齢71歳で分類した場合の評価，の3種類で解析した。

結果：①症例全体での検討，および，③平均年齢71歳を境界とした検討では，通常レンズ使用と広角レンズ使用での評価に有意差はなかった。②網膜色素変性患者7例での検討では，広角レンズ使用での評価は通常レンズ使用より有意に高かった（p＜0.05）。使用アンケート評価では，「明るく見える」との回答が半数以上を占めたが，短所として「画面が小さい」，「距離感・立体感がつかみにくい」などがあった。

結論：短所に対して改善の余地はあるが，視野狭窄や夜盲がある患者では有用なデバイスであると考えられた。

Abstract　Purpose：To evaluate the usefulness of MW-10HiKARI（MW-10）visual aid glasses in patients with ocular diseases.

Materials and Methods：The study involved 49 eyes of 25 patients（14 men, and 11 women；mean age, 71±12 years；range, 33〜88 years）with visual impairment（visual field defect, night blindness, or vision loss）. A standard lens or a wide-angle lens was mounted on the MW-10 and were provided to the patients for use. They were requested to walk in the clinic and fill a questionnaire regarding the usefulness of the instrument on a 5-point scale and in a free-form format. Three experiments were conducted；the first and second experiments involved evaluation by patients with visual impairment and by patients with retinitis pigmentosa, respectively. The third experiment compared the findings in patients≦71 years and those＞71 years of age.

Results：The questionnaire findings between the use of a normal lens and that of a wide-angle lens in experiments 1 and 3 were comparable；however, the use of a wide-angle lens was significantly different from that of a normal lens in experiment 2（p＜0.05）. The answer to the question on the use of the instrument was recorded as “It looks bright” by more than half of the patients, but some patients expressed a few limitations, such as the “Screen is small” and “It is difficult to get the feeling of the distance and the third dimension”.

Conclusion：Although a few limitations were recorded with the use of visual aid glasses, which could be improvised further, it may prove to be a useful device for improving the quality vision in patients with visual impairment.