orthoptist
A licensed medical professional in Japan who specializes in orthoptics, performing eye examinations and vision therapy under the direction of an ophthalmologist.
Orthoptists perform vision tests and strabismus training in ophthalmology clinics.
An ophthalmologist (medical doctor), while 視能訓練士 is a co-medical professional specializing in orthoptics.
Orthoptics (the field of treatment), whereas 視能訓練士 is the practitioner.
Compound of 視能 (visual function) + 訓練 (training) + 士 (professional). The term was established with the national certification system for orthoptists in Japan.