A professional who tests and measures eye function to assist ophthalmologist to diagnose and treat eye disorders and disease. Responsibilities include:

• Tests patient's far acuity, near acuity, peripheral vision, depth perception, and color perception to assist ophthalmologist to diagnose and treat eye disorders and disease.
• Examines eye, using slit lamp, for abnormalities of cornea, and anterior and posterior chambers.
• Applies drops to anesthetize, dilate, or medicate eyes.
• Measures intraocular pressure of eyes (glaucoma test).
• Tests patient's field of vision, including central and peripheral vision, for defects, and charts test results on graph paper.
• Measures axial length of eye, using ultrasound equipment.
• Performs other tests and measurements as requested by physician.
• Gives instructions to patients concerning eye care.
• May supervise other technicians and be known as Chief Ophthalmic Technician.