LENS CARE AND SOLUTIONS (VIVA)

Question 1

What are the 10 rules for CL wearers to comply to?

Answer 1

1. For novice wearer, build up wearing hours slowly, start with 2 or 4 hours and increase by 2 hours each day
2. Wash hands and dry thoroughly before handling cl
3. rub and rinse lenses after each use. Use fresh solution each time to disinfect.
4. Do not sleep with lenses unless instructed by eye care practitioner
5. No tap water. Do not swim or shower with lenses on
6. Rub lens case and rinse with disinfecting solution before air dry. Replace case according to manufacturer recommendation
7. Stop lens wear if eyes get red, vision blur or any discomfort or pain
8. Replace lenses according to schedule
9. Only use CL resetting solutions to relieve dryness when lenses are worn
10. Regular check up every 6 months

Question 2

What are 4 consequences of denatured protein buildup on CL?

Answer 2

1. Opaque deposit can affect vision
2. Deposit can rub against palpebral conjunctiva to induce GPC (giant palpebral conjunctivitis)
3. Lens deposits take up CHEM in CL sol during soaking and release it into The Eye later on. This can result on toxicity or hyper sensitivity or allergic response
4. Lens deposits also can increase microbial adherence to CL and hence increase risk of infection

Question 3

What are the 4 advantages of MPS?

Answer 3

1. Convenient
2. Effective
3. Safe
4. Largely without the toxicity and hypersensitivity adverse effects

Question 4

What are the 3 disadvantages of MPS?

Answer 4

1. The more ingredients in a MPS, the higher chance of toxicity reaction
2. Group 4 ionic polymers may react negatively with potassium sorbate or sorbitol acid preserved solutions
3. SiHy do seem to show affinity for preservative build up on lens

Question 5

What are the 4 advantages of H2O2 solutions?

Answer 5

1. Excellent antimicrobial efficacy by oxidising microbes
2. pH of 4, able to break protein and lipid bonds and remove trapped debris
3. Ideal for px who have hypersensitive or dry eyes
4. Neutralising is easy with the use of platinum disk or catalase tablet (convenience)

Question 6

What are the 4 disadvantages of H2O2?

Answer 6

1. the neutralisation process happened to fast so unable to kill acathamoeba cyst
2. solution after neutralisation does not protect lenses against microbes
3. 3% H2O2 is toxic to the eyes
4. Not as convenient as MPS as if needs to be neutralisef

Question 7

What is the main purpose of MPS for RGP and SCL?

Answer 7

To clean, remove protein, rinse, disinfect, condition and soak/store the lenses

Question 8

Why is H2O2 considered the gold standard for disinfection system?

Answer 8

3% H2O2 can kill most microbes within minutes

Neutralise to water and oxygen and considered preservatives free

Question 9

What are 4 ingredients in MPS?

Answer 9

Buffers/salts
Cleaning agents
Disinfectants/ preservatives
Wetting agent/lubricants