A medical professional who examines eyes and prescribes corrective lenses. In Japan, this role is often performed by a certified 視能訓練士 (orthoptist) or an ophthalmologist, but 視力検定医 specifically refers to an optometrist.
An optometrist measures a patient's visual acuity and prescribes appropriate glasses or contact lenses.
Compound of 視力 (visual acuity), 検定 (official certification or examination), and 医 (doctor). The term directly describes a doctor certified to examine visual acuity.