Brainscape's Knowledge GenomeTM

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


See full index

Contact lens > GP complications > Flashcards

GP complications Flashcards

1
Q

What should be part of a GP A/C app

A 
Case hx: 
- dexterity of insertion/removal
- wear time - 2+1 - max hrs - days/wk
Comfort/vision cleaning/storage
Qs/concerns
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

GP A/C SLE

A

White light:

  • centration - with/w/o lids
  • movement - blink/lateral gaze
  • integrity - deposits/tears/scratches

Blue light:
- check pattern - consistent?

Health:
- lid eversion - papillae
Hyperaemia - esp limbal area
Cornea - central clouding?/other oedematous changes

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

Aetiology of 3/9 o’clock staining

A

Px factors:
- dry eye/poor tear film/poor wetting cl surface
Partial/reduced blinks
Inadequate mucin surfacing/resurfacing of cornea

Cl fit factors:
- excessive edge clearance/thickness
Cl size too small /poor centration/minimal movement
Ew>dw

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

Management of 3/9 o’clock staining

A 
Px education 
Tear supplements 
Improve blinking/rate
Improve cl fit
Increase cl wettability
Decrease surface deposits
Modify wear time 
Temp cease cl wear/refit with SCLs
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How to improve cl fit for 3/9 o’clock staining

A

Increase TD
Decrease edge clearance
Aspheric/blended back surface
Refit with mini sclerals?

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Aetiology of dellen

A

Elevations - pinguecula/pterygium/thick edged GP CLs

Tear film evaporation - dry corneal surface/exposure

Post op effects - IOL , sub-conj injections, recti muscles surgery, glaucoma procedures, suture granuloma

Episcleritis/scleritis
Cocaine administration (medical)
Paralytic lagophthalmos

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

DELLEN management

A 
Determine cause 
Ocular lubrication
Temp cease cl wear
DD SCLs - bandage cl monitor recovery
If cont cl use needed - consider SCL /mini Sclerals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How to treat a FB

A

Remove cl
Remove/flush FB - using sterile saline/artificial tears
Check under lids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Managing a FB

A

Prophylactic antibiotics may be required
Eye protection
Px education - expect fbs ocassionally
Change cl design/care system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Cl adherence is a common consequence of ..

A

Overnight GP cl wear
Occurs on wakin
48% users experience it

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

What makes cl adherence worse

A

Flat fit

Aspheric design

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Aetiology for cl adherence

A 
Ew 
Thinned/viscosity of aq depleted PLTF 
Lid pressure
Dehydration/contamination of PLTF
Physical properties/topography of cornea
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Cl factors leading to cl adherence

A 
Flat fit 
Small edge lift 
Large TD 
Limited movement 
Lid pressure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Management for cl adherence

A 
Px education 
- assess cl /morning 
Ocular lubricants 
Mobilise cl with lid pressure 
Never remove cl until mobile 
Cl fit
Decrease TD
Fit with slight apical pooling 
Increase tear vol
Revert to DW
Switch from aspheric design
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Aetiology for cl flexure

A 
Central cl too thin
Large BOZD/high minus BVP
Lid force on blinking
Corneal toricity
Material
Steep central fit 
Low lid position?
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Cl flexure may lead to…

A

Changes in residual astigmatism
Varied vision
Changes in cl parameters

17
Q

Managing cl flexure

A 
Thicker cl 
More rigid material
More o2 permeable material
Decrease BOZD
Fit BST/bitoric cl
18
Q

Causes of cl warpage

A

Heavy handling - poorly instructed px - cleans between thumb/finger

Cl case issues - flat base, smooth walls, cl pressed into bottom of well, dry storage, allowed to dry out

Thin cl design

19
Q

Managing cl warpage

A

Replace cl
Px re-education
Optimise cl design
Hands free cleaning

20
Q

Causes of corneal shape changes

A

Mechanical effect due to poor cl/cornea fit
Corneal bearing
Pressure from upper lid

21
Q

Ptosis and cls

A

Sign of long term GP cl wear
Very rare with SCLs
Possible adaptation? -to decrease cl movement
Reversible - expending on cause

22
Q

Ptosis and cl management’

A 
Temp cease cl wear
Refit SCLs 
Optimise cl edge shape 
Decrease thickness 
Severe cases may need surgery
23
Q

Surface crazing

A

Due to high silicone (siloxane) content (SA)
Material/manufacturing flaw
Interaction with cl care products
Individual anterior eye environments

Uncommon with modern materials FSAs

24
Q

Papillae v follicles

A

Papillae is chronic response - allergy typ1/3
Follicles acute response -toxic reaction to chemicals/chlamydia not allergy/hypersensitivity related

Papillae seen in cl wear/Normals
Follicles not assoc with cls

Papillae superior palpebral conj near lateral canthus
Follicles inferior palpebral conj near lateral canthus

Papilllae have vascular tuft
Follicles avascular

25
Q

Scleral cl complications

A

Conjunctival prolapse
Post lens clouding
Solution reaction

Contact lens (8 decks)

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