CARE AND MAINTENANCE
School of Optometry & Ophthalmology, The Wenzhou Medical College
DEPOSITS
COMPLICATIONS
• Irritation and reduced comfort • Reduced visual acuity • Shortened lens life • Increased potential for infection • Increased incidence of GPC
Foreign particle
Mutual repulsion
Surfactant molecules
5
DAILY CLEANER GENERAL PROCEDURES
1、Wash hands 2、Place lens in the palm of the hand 3、Place 2-3 drops of cleaner on each lens surface 4、Rub with forefinger for about 15 seconds
THERMAL DISINFECTION
Method
Clean and rinse lenses Place lenses in fresh saline in lens case Secure lid(s) and place lens case in thermal
disinfecting unit After heat cycle allow lenses to cool before use
Disinfection:Killing and/or removal of vegetative microbial and viral contamination from inanimate objects –disinfectants
Preservation:Killing and/or inhibition of growth of selected micro-organisms - preservatives.
Reducing deposits Attaining & maintaining ready-to-wear-state
CARE AND MAINTENANCE
COMPONENTS
• Daily cleaner • Rinsing solution • Disinfecting solution/unit • Weekly/protein cleaner • Lubrication/rewetting solution • Lens storage case
DAILY CLEANER
FUNCTION To remove:
Loosely bound foreign matter
• cell debris • mucus, lipid, protein • cosmetic or other surface Contamination
Majority of micro-organisms
DISINFECTION SYSTEM TYPES
• Heat (thermal unit, microwave) • Chemical
• Oxidative • Hydrogen peroxide • Chlorine
• Cold chemicals • Various disinfectants
Care and Maintenance
PURPOSE Clean lenses Good comfort Good vision Safe lens wear Prolonged lens life
ROLE OF CARE & MAINTENANCE
Preventing and minimizing microbial contamination
DISINFECTING SOLUTION FUNCTIONS
• Kill or deactivate potentially pathogenic organisms including:
Bacteria Fungi Viruses Amoebas
• Maintain lens hydration
– Preserved – Unpreserved
Multi-purpose solution
ANTIMICROBIAL ACTIVITY
LEVELS OF EFFICACY
Sterilization:Killing of all microbial life forms sterilizers
per side using a‘to &fro’and ‘L-R’action Rolling the forefinger in both directions cleans the lens periphery 5、Rinse well
RINSING SOLUTION TYPES
SaTION
ADVANTAGES
Short disinfection cycle times(10-30mins) Highly effective antimicrobial Low risk of toxic or allergic reaction
CLEANER COMPOSITION
Surfactants 表面活化剂
Buffers 缓冲系统
Osmolality adjusting agent(s) 渗透压缓冲剂
Preservatives 防腐剂
Water 水
SURFACTANT CLAENERS TYPES
Daily cleaners Weekly cleaners
THERMAL DISINFECTION
Original form of disinfection High temperatures kill micro-organisms by:
– denaturation of cell components – disruption of plasma membranes – DNA damage