CL selection

Question 1

What are some advantages of soft CLs?

Answer 1

Good initial comfort
Less fitting knowledge needed
Easy to make changes (rx, lens type) due to frequent replacement
Less deposit build up
Can use for FTW and occasional wear

Question 2

What are some disadvantages of soft CLs?

Answer 2

Increased infection and complication risk
Poor correction for irregular corneas
Not customisable
Can buy online (disadv for practitioners)

Question 3

What are some advantages of DDs?

Answer 3

Convenient
Good for occasional wear at low cost
Reduced infection/complication risk
No need for sols
Good choice for bleph/MGD/deposit build up

Question 4

What are some disadvantages of DDs?

Answer 4

Expensive for FTW
Limited parameters
Higher environmental impact
Chance of px rewearing

Question 5

What are some advantages of 2 weeklies?

Answer 5

Reduced infection/complication risk
Better than monthlies for bleph/MGD/deposit build up

Question 6

What are some disadvantages of 2 weeklies?

Answer 6

Higher cost than monthlies
Poor compliance in replacement times
Smaller parameters than monthlies

Question 7

What are some advantages of monthlies?

Answer 7

Increased parameters
Cheaper than more frequent replacement types

Question 8

What are some disadvantages of monthlies?

Answer 8

Increased deposits compared to 2 weeklies

Question 9

What are some advantages of extended wear?

Answer 9

Convenient for px
Good for px’s with poor mobility and px’s with anisometropia
Can be used as bandage

Question 10

What are some disadvantages of extended wear?

Answer 10

Increased infection risk
Px’s not very good at compliance

Question 11

What are some advantages of planned replacement lenses?

Answer 11

Increased parameters
Can get customised, hand painted lenses

Question 12

What are some disadvantages of planned replacement lenses?

Answer 12

Increased deposits and complications
Expensive to replace
Careful cleaning needed

Question 13

What rx types do DDs come in?

Answer 13

SV sphere
SV toric
SV coloured sphere
MF sphere

Question 14

What rx types do 2/52 come in?

Answer 14

SV sphere
SV toric
SV coloured sphere
MF sphere
MF toric

Question 15

What rx types do EW come in?

Answer 15

SV sphere
SV toric

Question 16

What rx types do planned replacement come in?

Answer 16

SV sphere
SV toric
SV coloured sphere
SV coloured toric
MF sphere
MF toric
Hand painted cosmetic

Question 17

What rx types do RGPs come in?

Answer 17

SV sphere
SV toric
MF sphere
MF toric
Bifocal

Question 18

What is the HVID?

Answer 18

Horizontal visible iris diameter

Question 19

What is VPA?

Answer 19

Visible palpebral aperture

Question 20

What is the BC?

Answer 20

Base curve - radius of curvature of the back surface of the lens

Question 21

What is the TD?

Answer 21

Total diameter - of the lens

Question 22

What are some advantages of Silicone Hydrogels?

Answer 22

Increased oxygen permeability
Reduced water content
Lower modulus (more comfortable) - 1st gen
Can be extended wear
Better for dry eye/CLIDE

Question 23

What are some disadvantages of Silicone Hydrogels?

Answer 23

Increased lipid deposits
Higher modulus (worse comfort and increased mechanical complications)
Higher price
Poorer wettability due to silicone being hydrophobic
Issues with preservatives in solutions

Question 24

What are some advantages of Hydrogels?

Answer 24

Cheaper
Increased parameters and modalities
Lower modulus (better comfort)
Reduced lipid deposits
Hydrophilic - good for MGD pxs

Question 25

What are some disadvantages of Hydrogels?

Answer 25

Reduced oxygen permeability
Increased water content
No EW or long wearing times
Hypoxia complications

Question 26

What are some advantages of RGPs?

Answer 26

Better vision
Reduced infection risk
Increased oxygen supply (tear/material exchange)
Reduced complications
Large parameters as tailor made
Good for irregular corneas
Used for orthokeratology
Cheaper overall
Can correct up to -2.50 corneal astig using sphere only

Question 27

What are some disadvantages of RGPs?

Answer 27

2 week adaptation time
Large upfront cost and if needing to replace
More fitting knowledge needed
Careful cleaning needed
Has to be FTW otherwise adaptation disappears
Can’t use for contact sports or dusty environments
Increased chair time