7.3 Infection control, sterilization & patient education

Infection Control, Sterilization, and Patient Education

Ophthalmic practices see a high volume of patients who share equipment that touches the eye and the tear film, so rigorous infection control is essential. Adenoviral epidemic keratoconjunctivitis (EKC) is notoriously contagious and can spread through contaminated tonometer tips, slit-lamp surfaces, and unwashed hands.

Standard precautions and hand hygiene

Standard precautions treat every patient's body fluids, including tears, as potentially infectious.

• Perform hand hygiene before and after every patient contact, using alcohol-based rub or soap and water; wash with soap and water when hands are visibly soiled.
• Wear gloves when contact with drainage, mucous membranes, or non-intact skin is likely, and change them between patients.
• Clean and disinfect shared surfaces (slit-lamp chin rest and forehead band, phoropter, trial frames) between patients.
• Cover coughs, and when possible isolate or reschedule patients with obvious active viral conjunctivitis.

Because tears and ocular discharge readily carry adenovirus and bacteria, the single most effective barrier is thorough, frequent hand hygiene between every patient. Alcohol-based rubs are fast and effective on clean hands, but visibly soiled hands must be washed with soap and water. Personal protective equipment (gloves, and eye protection during procedures that may generate splashes) supplements, but never replaces, hand hygiene.

Cleaning, disinfection, and sterilization

These three terms are not interchangeable:

• Cleaning physically removes debris and organic matter; it must precede disinfection and sterilization.
• Disinfection kills most microorganisms but not necessarily all spores. It is used for semi-critical items that touch intact mucous membranes or the tear film.
• Sterilization destroys all microbial life, including spores, and is required for critical items that penetrate tissue, such as surgical instruments and needles.

The Goldmann applanation tonometer tip is the classic semi-critical item. After each use it should be cleaned and disinfected per manufacturer guidance, commonly by wiping and soaking in a disinfectant such as diluted sodium hypochlorite (bleach) or hydrogen peroxide, then rinsing and drying, because residual disinfectant can cause corneal toxicity. Alcohol wipes alone may not reliably kill adenovirus and can damage the tip. Many practices now use single-use, disposable tonometer tips or covers to eliminate cross-infection risk. Reusable instruments used for procedures that penetrate the eye require sterilization, typically by autoclave.

Preventing cross-infection

• Never touch a dropper tip to the eye, lashes, or fingers; prefer single-patient or preservative-free vials and never share bottles between patients.
• During an EKC outbreak, dedicate equipment, disinfect aggressively, and defer non-urgent applanation tonometry.
• Dispose of sharps in approved containers and handle fluorescein strips as single-use.

Sharps safety deserves special emphasis: never recap needles by hand, activate safety devices immediately, and place all sharps directly into a puncture-resistant container. If a blood or body-fluid exposure occurs, wash the area, report it at once, and follow the practice's post-exposure protocol. Staff should keep required immunizations, including hepatitis B, current as part of a comprehensive infection-control program.

Instrument reprocessing at a glance

Patient education and communication

Technicians spend more time with patients than physicians do and are often the primary educators. Effective teaching improves adherence and outcomes.

• Drop technique: demonstrate the lower-lid pocket method, one drop per eye, eyes closed, and punctal occlusion, then have the patient teach it back to confirm mastery.
• Adherence: explain that glaucoma drops must be used daily even without symptoms, because glaucoma is asymptomatic until late; link dosing to daily routines and address cost or side-effect barriers.
• Age-specific care: for children, involve caregivers and use simple language; for older adults, account for arthritis, tremor, and memory issues, and suggest drop aids and written schedules.
• Cultural and language needs: use qualified interpreters and translated materials, confirm understanding, and respect health beliefs.
• Confirm that patients know the warning signs that require a call back and when to return for follow-up.

By combining consistent standard precautions, correct instrument reprocessing, and clear patient education, the technician protects the entire clinic from cross-infection while improving each patient's treatment success.

Communication that improves outcomes

Good communication is itself an infection-control and adherence tool. Poor drop technique wastes medication and can contaminate a bottle tip, so teaching correct instillation reduces both cost and infection risk. Techniques that work include the teach-back method, in which the patient demonstrates the skill back to the technician; plain, jargon-free language; and written or pictorial instructions the patient can take home. For patients with limited English proficiency, use a qualified medical interpreter rather than family members whenever possible, and provide translated materials. For older adults, screen for physical barriers such as arthritis or tremor that make squeezing a bottle difficult, and for cognitive barriers that affect scheduling. For anxious or pediatric patients, a calm, unhurried manner improves cooperation. When patients understand why a drop matters, especially for a silent disease like glaucoma, and how to instill it correctly, adherence and clinical outcomes both improve, which is the ultimate goal of every patient interaction.