Ophthalmic Patient Care and Clinical Assisting
Domain focus
The COT exam tests clinical assisting as a safety-critical role: accurate intake, reliable preliminary tests, correct drop instillation, sterile technique, and clear patient education. Questions often ask what the technician should do next or which finding must be escalated.
Intake and preliminary testing
Record chief complaint in the patient's words, ocular and medical history, medications (including eye drops), allergies, and family history. Measure visual acuity with correction and pinhole; document each eye separately and the method (Snellen, ETDRS). Check pupils for size, symmetry, reactivity, and an afferent pupillary defect using the swinging-flashlight test. Perform confrontation fields when indicated.
Drop instillation and pharmacology
Wash hands, verify the correct patient, eye, drug, dose, and expiration. Shake suspensions such as prednisolone acetate. Pull the lower lid to form a cul-de-sac, avoid touching the tip to the eye, instil one drop, and apply punctal occlusion for 1–2 minutes. Wait at least 5 minutes between different drops. Mydriatics/cycloplegics can precipitate angle closure; anesthetics are for procedures only and repeated use delays epithelial healing. Document time, drug, concentration, and eye.
Infection control and emergencies
Disinfect tonometer tips per manufacturer (e.g., 10-minute soak in 1:10 bleach or 70% isopropyl alcohol wipes with drying), and never reuse a disposable tip. For a chemical splash, remove contact lenses, irrigate with saline or balanced salt solution for at least 15–30 minutes, check pH, and arrange urgent ophthalmology review. Report needle sticks and exposures immediately.
Worked example
A patient prescribed timolol and latanoprost asks why the technician pinches the inner corner after drops. Punctal occlusion compresses the nasolacrimal canal, reducing drainage into the nose and systemic absorption; this matters for timolol because beta-blockade can worsen asthma or bradycardia. The correct instruction is to occlude for 1–2 minutes after each drop and to wait 5 minutes before the next medication.
Traps
Do not touch the dropper tip; do not instil a cloudy suspension without shaking; do not skip allergy verification; do not irrigate a chemical eye with tap water when saline is available; do not document a test as normal if the patient could not perform it.