Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Stage 1 Visit 1 > Competency 5.1.2 > Flashcards

Competency 5.1.2 Flashcards

1
Q

Needs of a SCL Teach

A
  • Clear instructions of lens insertion and removal
  • Clear instructions on hand hygiene when handling lenses/cases
  • Observation of lens handling and I&R
  • Explain cannot sleep, shower or swim in lenses
  • Explain cannot mix lenses in any way with water
  • Advised to build up wear time initially
  • Advised to remove lenses if any pain/redness/discharge and seek help (us or A&E)
  • Provide information booklet
  • If daily:
    • Do not reuse lenses
  • If monthly:
    • Cannot be used for more than month after opening
    • Advised on care regime
    • Replace case and solution every 3 months
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

SCL Edge Designs

A
  • Silicone hydrogel lenses can have thinner edge which improves comfort but may result in conjunctival staining
  • Known as knife edge design
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Hydrogel as a SCL Material

A
  • Very flexible material due to high water content which results in high comfort due to low modulus
  • Oxygen transmissibility is dependent on the water content of the lens
  • They become dehydrated in long periods of wear and lens becomes tighter on the eye
  • Poorer wettability
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is Example of Hydrogel Material

A
  • poly-HEMA
  • Dailies AquaComfort plus (Vitrea)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Advantages of Hydrogel Lenses

A
  • Flexible
  • Affordable
  • Good initial comfort
  • Thinner lens
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Disadvantages of Hydrogel Lenses

A
  • Low oxygen permeability
  • Potentially higher risk of infection
  • Not ideal for overnight wear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Silicone Hydrogel as a SCL Material

A
  • Allow 5x more oxygen through
  • Oxygen permeability is dependent on silicone rather than on water content
  • Initial SiHy lenses were treated with coating due to poor wettability but no longer required
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Advantages of Silicon Hydrogel Lenses

A
  • High oxygen permeability
  • Easier to handle
  • More durable
  • Extended wear options available
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Disadvantages of Silicon Hydrogel Lenses

A
  • Slightly higher price
  • Higher risk of GPC, but this is reduced in newer reduced modulus lenses
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Disposable Lenses in Alloa Specsavers

A

Easyvision Linarial
- Spherical
- Toric
- Multifocal
Dailies Total 1
- Spherical

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

Linarial Spherical SCL Characteristics

A
  • Coopervision My Day
  • BC/TD: 8.4/14.2
  • SiHy (Stenfilcon A)
  • Dk/t:100 (at -3.00DS)
  • H20 Content:54%
  • UV: Yes
  • Rx Range:
    • -6.00DS to +5.00DS in 0.25D steps
    • Upto -12.00DS
    • Upto +8.00DS
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Monthly Lenses in Alloa Specsavers

A

Opteyes
- (XR) Spherical
- (XR) Toric
- Multifocal
- Toric Multifocal
Uvicia Monthly
- Spherical
- Toric

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

Opteyes Spherical SCL Characteristics

A
  • Coopervision Biofinity
  • BC/TD: 8.6/14.0
  • SiHy (Comfilcon A)
  • Dk/t: 171
  • H20 Content:48%
  • UV: No
  • Rx Range (XR Range):
    • Upto ±20.00DS
    • Upto -5.75DC
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Preservatives in SCL Solutions

A
  • Example is polyhexanide
  • Can cause toxicity or hypersensitivity
  • Can manifest as hyperaemia, punctate keratopathy or corneal infiltrates
  • cause bother for individuals with allergies
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What to do if Problems With Preservatives in Solution

A
  • Reduce wear time if minor reaction
  • Switch to daily lenses
  • Hydrogen Peroxide solutions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Specsavers Easyvision Allpurpose Solution Features

A
  • Cleaning, disinfecting, hydrating and replenishing all in one
  • Minimum of 4 hours to clean the lens
  • Once opened discarded after 3 months
17
Q

Specsavers Easyvision Allpurpose Solution Ingredients

A

Sodium Chloride- Tonicity Adjuster
Boric Acid - Disinfectant
Sodium Tetraborate - Buffer
Sodium Citrate - Buffer
Poloxamer 407 - Cleaner
Hyaluronic Acid - Lubricant
Disodium Edetate 0.02% - Preservative/chelating agent
Polyhexamethylene 0.0001% - Preservative

18
Q

Solution Ingredient Purposes

A

Preservative
- Maintains sterility of solution
Viscosity Enhancer
- Thickens solution
Tonicity Adjuster
- Maintains ideal salt concentration
Buffer
- Maintain pH between 7.0 and 7.4
Disinfectant
- To disinfect
Chelatin Agent
- Prevent protein bonding to lens

19
Q

Hydrogen Peroxide Solutions

A
  • Gold standard of SCL care
  • Higher disinfecting power and are able to disinfect inside the polymer matrix of the lens
  • Do not feature a preservative so are excellent option for atopic patients
  • Is toxic to ocular surface if not neutralised
  • 6 hours to neutralise solution from 3% to 0.1%
20
Q

Hydrogen Peroxide Solution Steps

A
  • Remove lenses and place into R&L baskets
  • Rinse each lens for circa 5s in their baskets with hydrogen peroxide 3%
  • Fit case to line with hydrogen peroxide 3%
  • Place lenses into case and solution will start to bubble. Store upright
  • Allow to soak for atleast 6 hours (overnight preferred)
  • Rinse with sterile saline prior to insertion
  • Discard old solution from case, rinse with fresh hydrogen peroxide and leave to air dry.
21
Q

Hydrogen Peroxide Solution Ingredients

A

3% Hydrogen Peroxide - Active ingredient
Sodium Chloride - Tonicity Adjuster
Sodium Phosphate - Buffer
Poloxamer - Polymer surfactant
HEDP - Prolongues lifespan
Purified water - Solvent

22
Q

Importance of Tonicity Adjuster

A
  • Too high salt concentration and cornea will dry out
  • Too low salt concentration and cornea will swell up
23
Q
A

Stage 1 Visit 1 (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions