自動車運転について相談があった視覚障害の身体障害者手帳の該当がない3症例のFunctional Vision Scoreでの評価

Functional Vision Score in three cases who were not classified as visually handicapped and who sought advice about driving

要約　目的：自動車運転の相談があった視覚障害者手帳に該当しない3例のFunctional Vision Score（FVS）の評価を行ったので報告する。

対象と方法：症例1は53歳男性，緑内障。症例2は55歳男性，網膜色素変性。症例3は46歳女性，下垂体腫瘍。FVSおよび，イリノイ州（米国），英国，および日本の運転免許の資格基準で比較した。

結果：症例1はFVS67.4。身体障害者5級相当の視覚障害を認めた。運転は米国で適格あり，英国と日本で適格なし。症例2はFVS54.7。手帳は該当なし。運転は米国と日本で適格あり，英国で適格なし。症例3はFVS77.6。手帳は該当なし。運転は米国と日本で適格あり，英国で適格なし。

結論：運転の不自由さは，FVSや英国の視野規定では実勢に即して評価できる可能性が示唆され，中心暗点の症例ではFVSにより正確に評価できた。

Abstract　Purpose：To report 3 who sought advice regarding eligibility of driving. All the 3 cases were not classified as visually disabled by Japanese law, but they had problems when driving.

Cases：The cases were：a 53-year-old male with glaucoma, a 55-year-old male with retinitis pigmentosa, and a 46-year-old female with pituitary adenoma. They were examined by Functional Vision Score, by standards for driving eligibility in Illinois, by those in UK and Japan.

Results：Functional Vision Score was 67.4 in Case 1. He was graded as Grade 5 in Japan. He was eligible for driving in US, and not in UK or Japan. Functional Vision Score was 54.7 in Case 2. He was not gradable as visually handicapped in Japan. He was eligible for driving in US and Japan, and not in UK. Functional Vision Score was 77.6 in Case 3. She was not gradable as visually handicapped in Japan. She was eligible for driving in US and Japan, and not in UK.

Conclusion：Eligibility for driving may be evaluated either according to Functional Vision Score or UK standard. Functional Vision Score is more sensitive for persons with loss in the central visual field.