glossary

Combination of the curvatures of the front and rear surfaces of a lens, measured in diopters.

Eyecare professional, designs and adapts eyeglasses in accordance with measurements specific to each wearer. Professional who makes and adjusts optical aids, e.g., eyeglass lenses, from refraction prescriptions supplied by an ophthalmologist or optometrist.

Eyecare professional, conducts refractive examinations, fits contact lenses and assesses overall eye health. Doctor of optometry (OD) specializing in vision problems, treating vision conditions with spectacles, contact lenses, low vision aids and vision therapy, and prescribing medications for certain eye diseases.