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Contact Lenses > therapeutic contact lenses > Flashcards

therapeutic contact lenses Flashcards

1
Q

According to the CLEAR report, what can therapeutic contact lenses be divided into?

A

Bandage CLs and Rehabilitative CLs

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2
Q

What do bandage CLs do?

A

Treatment of ocular discomfort or support/ protect the cornea

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3
Q

What do rehabilitative CLs do?

A

Prescribed when px struggling to achieve good visual becasue of RX or cosmetic result after trauma

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4
Q

What are the four types of therapeutic CLs?

A
  • bandage
  • lenses for chronic conditions
  • light reducing
  • cosmetic
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5
Q

What are some uses for bandage cls? There are loads

A
  • Cross linking
  • Persistent corneal epithelial defects
  • corneal abrasions
  • penetrating keratoplasty
  • post pterygium surgery
  • post-trabeculectomy bleb leaks
  • corneal perforations and trauma
  • entropion
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6
Q

What are the main similarities with the uses of bandage cls?

A

Issues with corneal epithelium and require protection

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7
Q

Do px who have had lasik or lasek require bandage cls?

A

No- there is no benefit to comfort no healing rate

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8
Q

Name one type of bandage cls?

A

Amniotic lenses

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9
Q

What is an amniotic lens produced from?

A

The amniotic sac of pregnant women

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10
Q

What is an amniotic cls used for? And why?

A

Recurrent corneal erosion, allows epithelial cells to regenerate

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11
Q

How is an amniotic lens put on the eye ?

A

Either with a soft cls on top or it is sutured on

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12
Q

How is a sutured amniotic lens removed?

A

It dissolves

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13
Q

Name four chronic conditions which therapeutic cls may be used in

A
  • graft vs host syndrome
  • Sjögren’s syndrome (linked to dry eye)
  • Steven’s Johnson’s syndrome
  • filamentary keratitis
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14
Q

What contact lenses are beneficial for px with chronic condition? And why?

A

Mini-scleral lenses,
corneal surface is protected and prevents further corneal insult + fluid layer keeps cornea hydrated

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15
Q

Can a px wear min-scleral lenses over night?

A

Yes in severe cases to stabilise epithelium

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16
Q

What are two indicators to use prosthetic lenses ?

A

1) improve cosmesis
2) reduce light entering the eye

17
Q

In what condition would you want to reduce light entering the eye?

A

Albinism

18
Q

What are the three ways cosmetic lenses can be produced?

A
  • tinted
  • screen tinted (looks like an iris)
  • hand painted(hand painted to look like px iris)
19
Q

What is a tinted lens?

A

Solid colours + no iris detail +come in a range of tint densities

20
Q

How do you decide whether they have a clear or black pupil?

A

What they actually required the lens for; is it for cosmesis or light reducing

21
Q

What does a screen printed lens allow for compared to a tinted lens?

A

Iris detail

22
Q

What is a pro of screen printed cls?

A

Can be mass produces in a reproducible way

23
Q

What is required for a success of a hand painted cls?

A

A clear photo taken of a px eye in good day light for colours to be matched

24
Q

Do the cured and uncured colours match of a Hand painted cls?

A

No - the skill is the painter need to known what colour will form after the cl has been formed

25
Q

Why would you give a px with strabismus a cls?

A

If they have a constant strab then for cosmetic purposes so their eyes look straight

26
Q

What is involved in the initial fitting of a Therapeutic cls for strab pxs?

A

DATACT lens is put on px eye and a picture is taken of where these dots on the cls lie + another Pic is taken off other eye

27
Q

After am initial fitting what is done with the two pictures taken?

A

It is sent to the lab and the artist will paint a Decentred iris so that when is put onto the px their eyes will look straight

28
Q

What is another pro apart from cosmesis for a pc with Therapeutic cls for strab?

A

They will have no vision out of that eye _ no visual disturbances + they will have more confidence

29
Q

What are special effect cls?

A

Used for characters in movies

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