A professional who aids persons with correctable focusing defects to develop and use binocular vision (focusing of both eyes). Responsibilities include:

• Measures visual acuity, focusing ability, and eye-motor movement of eyes, separately and jointly.
• Aids patient to move, focus, and coordinate both eyes to aid in visual development.
• Develops visual skills, near-visual discrimination, and depth perception, using developmental glasses and prisms.
• Instructs adult patients or parents of young patients in utilization of corrective methods at home.