Ключевые слова: acuity, adjusting, astigmatism, background, care, clinic, close, diagnosis, dial, doctor, equipment, error, exam, examination, eye, eyesight, frame, gray, health, healthcare, hospital, hyperopia, indoors, instrument, lenses, measurement, medical, medicine, myopia, nobody, ophthalmic, ophthalmology, optical, optician, optics, optometrist, optometry, patient, phoropter, presbyopia, prescription, professional, refractive, technology, test, trial, up, vision, visual,