CLM - RGP Lens Maintenance - Week 3 Flashcards

1
Q

What are six key solution requirements for RGPs?

A

Antimicrobial afficacy
Non-toxic to ocular tissues
Minimal effect on lens parameters
Simple
Convenient
Inexpensive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

List two common types of RGP lens materials. Do they have small or large matrix pores? Do deposits remain on the lens surface or is this minimal?

A

Silicon-acrylates
Fluoro-silicon acrylates
-small matrix pores
-deposits remain on the lens surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What effect does the silicon component of a RGP lens have on its wettability?

A

Decreases wettability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How often are RGPs replaced?

A

Yearly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

List two kinds of RGP cleaning solutions.

A

Daily cleaners
Protein removers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a suitable rinsing solution for an RGP?

A

Preserved saline solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Are RGP disinfection solutions specific for RGPs? What is it used for (2) and what two additional agents does it contain?

A

Solutions are specific for RGPs
Contains wetting and viscosity enhancing agents

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Are hydrogen peroxide solutions suitable for RGPs?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Do multipurpose soltutions exist for RGPs?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does a wetting agent produce, what does this act as a buffer for (name what this effect is called), and what does it improve and ultimately reduce?

A

Produces an even distribution of tears over the CL surface
Acts as a mechanical buffer between the lens and the eye - cushion effect
Improves biocompatibility of the contact lens, reducing deposition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Do wetting agents provide comfort?

A

Yes, initial comfort

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do viscosity enhancing agents do and do they contribute to the cushion effect? Do they also contribute to the detergent/cleaning of the lens?

A

Increases contact time of solution on the lens/ocular surface
Lubricates and cushions
Doesnt contribute to cleaning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

List the six steps in RGP lens care routine.

A

Handwashing
Surface cleaning
Rinsing
Disinfection
Enzymatic cleaning
CL case care

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Are cleaners with isopropyl alcohol ideal for cleaning RGP lenses? Explain.

A

No, it removes mucin, but repeated use will change lens parameters and possible crack them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

In what two types of RGP lenses are abrasive surfactants/detergents contraindicated?

A

Hyper-Dk and plasma-treated lenses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the purpose of the CL rinsing step? Explain why.

A

Flushes loosened debris
Cleaners are toxic to the corneal epithelium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is benzalkonium chloride effective against (2)?

A

Bacteria and fungi

18
Q

Benzalkonium chloride’s efficacy is enhanced when combined with what compound?

19
Q

Does benzalkonium chloride bind to hydrogel materials?

20
Q

What is essential if using chlorhexidine digluconate and why? What does it have limited efficacy against?

A

Surface cleaning, because it readily binds to mucus
Not very effective against yeast/fungi

21
Q

Is chlorhexidine digluconate combined with EDTA?

22
Q

Is thimerosal a better antibacterial or antifungal? What is it often combined with?

A

Antifungal
Often combined with chlorhexidine digluconate

23
Q

List four complications of thimerosal and whether or not it is commonly used.

A

Conjunctival swelling
Limbal injection
Infiltrates
SPK
Rarely used

24
Q

What is EDTA and what does it inhibit? Does it cause irritation/allergy?

A

Chelating agent, inhibiting bacterial growth

25
What is benzyl alcohol used for (2) and what is needed if using it?
Effective for lipid removal and good antimicrobial activity Careful rinsing is essential
26
What do enzymatic/protein cleaners remove?
Removes bound insoluble protein
27
What happens to the immunogenic potential of bound protein with age?
It increases
28
What should always be done before and after using a protein/enzmatic cleaner?
Always surface clean before and after enzyme treatment
29
What should CL cases be washed with? What can be used to scrub it?
Scrub with a toothbrush or cotton bud and use saline
30
How often should CL cases be replaced?
Every three months
31
What are rewetting/comfort drops used for, and what three things do they do?
Used to rewet the lens surface while in the eye Stabilises the tear film Aids in the removal of mucus/debris Rinses away trapped debris
32
List one advantage and two disadvantages of mutlipurpose solutions.
Enhances compliance Compromised efficacy Increased sensitivity in some patients
33
Are multipurpose solutions often more or less viscous than other solutions?
More viscous (actually it's lower viscosity)
34
Is it ok to mix and match different brands?
Best not
35
What should be done to RGPs used on patients with known infectious diseases?
Dispose them
36
What is the standard routine in-office RGP disinfection protocol for a trial lens?
Surfactant 30 seconds Rinse with sterile saline Soak in 3% hydrogen peroxide for min 3h or sodium hypochlorite (0.4%) for min 30m or 0.5% for 5m Rinse with sterile saline Store dry Surface clean and rinse prior to use
37
If a patient uses hairspray, should it be used before or after RGP lens application? What about cosmetics?
Before Apply cosmetics after
38
Can eyeliner be applied if using RGP lenses?
Yes but shouldnt be applied to the inner lid margin
39
Hw should RGPs be stored by the patient?
In a disinfecting solution - or as recommended by the manufacturer
40
When should patients clean and disinfect their lenses before putting it on?
If stored for more than a week