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Contact Lenses > considering and fitting CLs > Flashcards

considering and fitting CLs Flashcards

1
Q

What must we do when fitting?

A
  • Record relevant info
  • Appropriate advice, written on how to clean, maintain and wear the lenses
  • Must give the CL specifications
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2
Q

What to consider if doing outside activities?

A

UV block

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3
Q

Where can I research contact lenses?

A

ACLM website

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4
Q

What are the advantages of RGP as a practioner?

A

We can correct astigmatism better
dryness is less at end of day

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5
Q

advantages of SiHy ?

A
  • comfortable to wear - enhanced wettability and slower dehydration
  • less hypoxia
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6
Q

disadvantages of sihy?

A
  • not always MAX comfort due to increased modulus –> foreign body sensation (POSSIBLE)
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7
Q

REMINDER - which deposits are found on a SiHy lens?

A

lipids (think of anisha and sundeep)

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8
Q

REMINDER - which deposits are found on a hydrogel lens?

A

proteins

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9
Q

What the disadvantages for dailies?

A

Cost and some lenses certain powers aren’t available

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10
Q

Why is oxygen reduction an issue?

A

hypoxia –> neovascularisation, oedema ect

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11
Q

what dk/t is needed for dailies?

A

37

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12
Q

what dk/t is needed for overnight wear?

A

125

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13
Q

how much corneal swelling is normal overnight?

A

4%

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14
Q

if hypoxia is a concern what lenses should you consider?

A

SiHy

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15
Q

what do you need to consider when giving lenses with a high rx?

A

For a high Myope +14 :
- Check the periphery for any oxygen issues
High plus:
- Check for a centre issues
Do not assume thought. We have to chec

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16
Q

what is important to consider with SiHys?

A

mechanical issues and tear exchange

17
Q

what is a limitation with hydrogels dk/t?

A

in theory = 40
reality = 22-28
meaning there will be some swelling

18
Q

what is theoretical dk/t for a SiHy and realistic? what does this mean for the px?

A

theoretical = 40-160
reality = 100-130
wearers can wear these lenses for a longer amount of time

19
Q

why are there more mechanical issues with sihy?

A

less water

20
Q

why is water content more important in hydrogels than sihy?

A

in sihy the silicone allows oxygen to pass, in hydrogels the water is needed for oxygen to pass

21
Q

what is considered as a low water content lens?

A

35-45%

22
Q

what is considered as a medium water content lens?

A

55%

23
Q

what is considered a high water content lens?

A

65%

24
Q

how does water content affect the flexibility of the lens?

A

the higher the water content, the higher he flexibility

25
Q

why does a px have dry eye?

A

they lack aqueous or poor tear quality

26
Q

what is a low TBUT?

A

less than 10 seconds

27
Q

what happens if you put a high water content lens in a dry eye?

A

It will act like a sponge and will want to absorb more water to maintain the shape of the lens making the eye more dry –> end of day comfort will be worse too.

28
Q

if someone has dry eye - what kind of lens do you want to give them?

A

LOW WATER CONENT

29
Q

What is the modulus of a lens?

A

how well a material can resist deformation

30
Q

what is stiffer - monthly or daily?

A

monthly

31
Q

Which soft lens has a higher modulus?

A

siHy (1-0.7)

32
Q

which soft lens has a lower modulus?

A

hydrogels (0.3-0.5)

33
Q

Why is modulus more relevant in monthly?

A

if edge profile is off px will find it uncomforable when they blink

34
Q

what are the 3 scenarios where considering oxygen is more important?

A

high prescriptions
extensive wear
history of hypoxia

35
Q

do you need to stress about oxygen?

A

no - consider with v high rx or EW

36
Q

is there an exact science for choosing CLs?

A

no LOL use your common sense when fitting

37
Q
A

Contact Lenses (16 decks)

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