This print study guide is designed to assist those studying to become a Certified Ophthalmic Assistant (COA), a certification level from the Joint Commission on Allied Health Personnel in Ophthalmology (JCAHPO). The guide includes a self-assessment section with 334 multiple-choice questions and a practice exam with 100 additional questions. An additional section reviews the questions and choices and explains why each possible answer is correct or incorrect. Also included are study tips, answer sheets, answer keys and a suggested reading list. All 19 JCAHPO content categories are included: History Taking; Pupillary Assessment; Equipment Maintenance and Repair; Lensometry; Keratometry; Medical Ethics, Legal and Regulatory Issues; Microbiology; Pharmacology; Ocular Motility; In-Office Minor Surgical Procedures; Ophthalmic Patient Services and Education; Ophthalmic Imaging; Refractometry; Spectacle Skills; Supplemental Skills; Tonometry; Visual Assessment; Visual Fields; Surgical Assisting in ASC or Hospital-Based OR.