The Foundation: Standard Precautions
Standard Precautions are the minimum infection prevention practices that apply to all patient care, regardless of the patient's suspected or confirmed infection status. The fundamental principle is that every patient's blood, body fluids, secretions (except sweat), non-intact skin, and mucous membranes are considered potentially infectious.
In ophthalmology, this means treating every set of tears, every corneal surface, and every piece of equipment that touches a patient as potentially contaminated.
Hand Hygiene
Hand hygiene is the single most important measure for preventing the transmission of infections in healthcare settings. In ophthalmic practice:
- Before and after every patient contact
- Before donning gloves and after removing gloves
- After touching potentially contaminated surfaces or equipment
- Between procedures on the same patient
Methods
- Alcohol-based hand rub: Preferred when hands are not visibly soiled. Apply product to all surfaces of hands, rub until dry (at least 20 seconds).
- Soap and water: Required when hands are visibly soiled, after contact with known spore-forming organisms (Clostridium), or after using the restroom.
Personal Protective Equipment (PPE)
In ophthalmology, PPE use is guided by the anticipated exposure:
- Gloves: Required for any procedure involving potential contact with tears, blood, or mucous membranes (tonometry, gonioscopy, foreign body removal, minor surgical procedures)
- Masks: During close patient contact when respiratory transmission is a concern, or during procedures that may generate splashes
- Protective eyewear or face shields: During procedures with splash risk (irrigation, drainage of abscesses)
- Gowns: During surgical procedures or situations with significant fluid exposure
Equipment Disinfection
Ophthalmic instruments and equipment require appropriate cleaning based on their classification:
Critical Items (Contact Sterile Tissue)
Instruments that enter sterile body areas (intraocular instruments, cannulas). Must be sterilized (autoclave, chemical sterilization).
Semi-Critical Items (Contact Mucous Membranes)
Instruments that touch mucous membranes but do not penetrate sterile tissue (tonometer tips, goniolenses, diagnostic contact lenses). Require high-level disinfection at minimum.
Non-Critical Items (Contact Intact Skin)
Surfaces and equipment that contact only intact skin (slit lamp chin rest, phoropter face shield, trial frames). Require low-level disinfection (wiping with EPA-registered disinfectant).
Ophthalmic-Specific Concerns
- Adenovirus outbreaks: Adenovirus can survive on dry surfaces for weeks. During suspected outbreaks, enhanced cleaning with EPA-registered virucidal agents is required.
- Multi-dose drop bottles: Can become contaminated. The tip should never touch the patient's eye or lashes. Some practices use single-dose units for high-risk situations.
- Trial contact lenses: Must be disinfected between patients according to the lens material and manufacturer guidelines.
- Prion considerations: Standard disinfection does not kill prions. Single-use tonometer tips are recommended for patients with known or suspected prion disease.
Key Takeaways
- Standard Precautions apply to every patient regardless of known infection status
- Hand hygiene is the single most effective infection prevention measure
- Equipment is classified as critical, semi-critical, or non-critical, each requiring different levels of disinfection
- Tonometer tips require high-level disinfection or single-use covers between patients
- Multi-dose bottles must never contact the patient to prevent cross-contamination