These include conducting visual acuity testing, visual field testing, lensometry, auto refractometry, refractometry, pupil assessment, extraocular motility, gross external examination, applanation tonometry, tonopen, eye drop instillation, diagnostic testing and participating in patient care within a clinical setting. Certifications, Licenses, and Registrations:Certified Ophthalmic Assistant (COA), Certified Ophthalmic Technician (COT), Certified Ophthalmic Medical Technologist (COMT), Ophthalmic Scribe Certification (OSC), Certified Retinal Angiographer (CRA), or Optical Coherence Tomography (OCT-C) required.