CL Solutions Flashcards
What are prions?
Denatured versions of naturally occuring proteins which can cause infection and are resistant to proteolysis and further denaturation
Give an example of a disease which is caused by a prion
nvCJD - causes plaques in the brain leading to dementia, personality changes, seizures (fatal)
What is a disadvantage of dry storage of PMMA RGPs?
Can distort the shape of the lens
What is the disadvantages of autoclaving RGPs?
Reduces lens life and doesn’t kill prions
What is the process for dry storage of RGPs?
- Rub and rinse in saline or purified water for 30 secs
- Use a detergent to clean lens, then rinse in saline again
- Soak in 1% hypochlorite solution for 10 mins
- Rinse in saline thoroughly for 10 mins, changing saline at least 3x
- Reuse immediately or store dry
What are the levels of hand washing?
1: Washing with soap before and after every patient
2: Washing with antiseptic scrub/soap plus alcohol gel before and after every patient/contaminated items
3: Pre-operative surgical scrub
What is the purpose of a wetting solution and when would it be used?
To aid comfort of RGP insertion, gives initial lubrication
(similar composition to lubricants)
What do surfactants do?
Remove proteins, lipids, bugs and their nutrients
What do enzymatic cleaners do? What lenses should they be used on?
Remove protein build up
Use on planned replacement soft CLs - optional for RGPs and higher frequency replacement soft CLs
How often should enzymatic cleaning be done?
1x per week/month
What are the types of enzymatic cleaners available and which lens type are they suitable for?
Tablet: Soft and RGP, e.g. Ultrazyme
Liquid: RGP only, e.g. Progent
What are the types of disinfectant solutions?
Preservative
Preservative free (chlorite)
Peroxide (3%)
How does a peroxide solution work?
Either 1 step or 2 step
Solution is neutralised over time via a platinum disc or catalase sodium pyruvate
Give an example of a peroxide solution
Oxysept 1Step
Give an example of a chlorite solution
Sauflon Synergi
