noun
unaided vision; naked-eye acuity; uncorrected visual acuity
Refers to visual acuity without glasses or contact lenses. Commonly used in medical, optometry, and everyday contexts.
裸眼視力が0.1以下なので、運転するときは必ず眼鏡をかけます。
My unaided vision is below 0.1, so I always wear glasses when driving.
I had my uncorrected visual acuity measured at the health checkup.