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OD2 - Applied Clinical Training & Research Studies in Vision and Optometry > CLM - Soft Contact Lenses - Week 4 > Flashcards

CLM - Soft Contact Lenses - Week 4 Flashcards

1
Q

Does Australia have a high or low proportion of RGP lens fits?

A

Lo

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2
Q

hat is the most popular modality of contact lenses world wide?

A

Soft

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3
Q

Do contact lenses have a short or long adaptation period?

A

Short

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4
Q

Do soft contact lenses induce corneal distortion?

A

Minimally

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5
Q

Do soft contact lenses cause spectacle blur?

A

Minimally

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6
Q

Do soft contact lenses have high or low on-eye stability?

A

High

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7
Q

Do soft contact lenses have a large or small optic zone? What does this mean for flare?

A

Large optic zone, giving minimal flare

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8
Q

Is aniseikonia larger or smaller with soft contact lenses compared to spectacles?

A

Reduced aniseikonia

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9
Q

Are anisometropic prescriptions more or less tolerated with soft contact lenses compared to spectacles?

A

Improved tolerance

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10
Q

Are soft contact lenses easy to replace?

A

yesd

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11
Q

Do soft contact lenses have a high or low risk of foreign body entrapment?

A

Low

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12
Q

Are soft contact lenses appropriate for high degrees of astigmatism?

A

Limited application

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13
Q

Are soft contact lenses suitable for irregular corneas like keratoconus or trauma?

A

May not be suitable

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14
Q

Compare the incidence of corneal inflammatory and infective events of soft contact lenses with RGP lenses.

A

Higher incidence

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15
Q

Are soft contact lenses durable?

A

Relatively low durability compared to RGP lenses

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16
Q

What deposits are soft contact lenses prone to (3)?

A

Protein
Mineral
Lipid

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17
Q

How often were conventional contact lenses replaced? What is the deadline? How long could they last?

A

Generally replaced in 6 month intervals
Should at least be replaced annually
Could last for 3+ years

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18
Q

How does the lens cost of conventional contact lenses compare with disposable soft contact lenses?

A

The lens itself is lower cost, but with care systems, it is more expensive

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19
Q

Do conventional contact lenses have a higher or lower overall rate of adverse reactions compared to disposable lenses?

A

Higher

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20
Q

Do conventional contact lenses have higher or lower oxygen permeability compared to soft contact lenses?

A

Lower

21
Q

Are conventional contact lenses common?

A

No

22
Q

List 4 reasons why regular lens replacements are important.

A

Minimise the effect of lens deterioration and deposition
Assists with compliance
Detect changes in refraction

23
Q

What is the most common contact lens modality?

A

Disposable

24
Q

List 4 advantages of disposable soft contact lenses.

A

Improved ocular health
Reduced deposits
Thinner lens profiles
Patient convenience

25
Q

What is the benefit of maintaining an inventory of disposable soft contact lenses in practice?

A

Allows easy trial of the correct BVP

26
Q

Do disposable soft contact lenses have a narrow or wide range of parameters?

A

Wide

27
Q

List 4 disadvantages of disposable soft contact lenses.

A

Most parameters are available, but some are not
Lens may sometimes rip in their packets
Occasional patient perception of higher cost
Patient attitude towards disposability

28
Q

What is the most common form of replacement schedules for disposable soft contact lenses?

A

Dailies (increasing trend)

29
Q

List 4 advantages of a daily replacement schedule for soft contact lenses.

A

Reduced potential for contamination
No cost/inconvenience of storage/solution
Minimal risk of physiological complications
Maximum comfort and vision due to no accumulation of deposits

30
Q

Which replacement schedule for soft contact lenses has the lowest incidence of non-severe keratitis?

A

Dailies

31
Q

How do the replacement schedules for soft contact lenses compare for the risk of microbial keratitis?

A

Some studies have not found any lower risk among specific schedules (they had similar risks)

32
Q

What is the general consensus on the replacement schedules for soft contact lenses?

A

Dailies have the least complications

33
Q

Compare the cost of dailies to the other replacement schedules.

A

Dailies cost more

34
Q

Compare the parameters of dailies to the other replacement schedules.

A

More limited parameters, including for astigmatism and presbyopia

35
Q

What is the base curve of daily contact lenses like and why does this matter?

A

Often only have one base curve

Not good for steep or flat corneas

36
Q

Are dryness symptoms more or less in 2 week contact lenses vs 4 week contact lenses?

A

Fewer

37
Q

What generally happens to wearing comfort and vision quality with monthly contact lenses?
How do the most recent SiH contact lenses compare?

A

A general decrease in both

SiH lenses were found not to differ significantly between 2 week and monthly

38
Q

List the following by compliance rate (highest to lowest):
Fortnightly
Monthly
Dailies

A

Dailies
Monthly
Fortnightly

39
Q

List three primary reasons for replacement non-compliance.

A

Forgetting which day to replace
Save money
Running out of lenses (DD)

40
Q

What is generally the handling tint density for soft contact lenses? Does it have any cosmetic effect on the eye?

A

10% density

No cosmetic effect on the eye

41
Q

In what two refractive errors is handling tint especially recommended and why?

A

Hyperopes and presbyopes who have near focussing difficulties

42
Q

Aside from handling tint, list three other useful tints for soft contact lenses.

A

Enhancement tint
Opaque tint
UV blocking

43
Q

What are enhancement tints and over what diameter are they tinted?

A

Can modify the apparent iris colour

Tinted over a diameter equal to the HVID

44
Q

Are enhancement tint colours additive?

A

Yes

45
Q

What are opaque tints and what effect do they have on visual field sensitivity?

A

Changes iris colour and is opaque

Visual field sensitivity is slightly reduced (<1dB)

46
Q

How does the comfort of lenses with an opaque tint compare to those without?

A

Slightly reduced comfort due to surface irregularties where the tint is

47
Q

Give an example of a non-cosmetic use for opaque tinted soft contact lenses.

A

A blind eye with a damaged or irregular pupil or damaged iris

48
Q

What percentage of UV light can UV blocking lenses absorb up to?

A

Up to 90%

OD2 - Applied Clinical Training & Research Studies in Vision and Optometry (174 decks)

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