SCL fitting Flashcards

1
Q

Steps in selecting a lens

A
  1. Decision on modality
  2. O2 & water content considerations
  3. Decision on material
  4. choose starting lens
  5. look at available Rx + cost
  6. Manufactures guide for fitting
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. Modality of wear consideration
A

Occasional (3hrs, 2/7)
- dailies

Work (9hrs, 5/7)
- monthlies

F/T wear at work, but non compliance
- dailies

Full time (16hrs, 6/7)
- fortnightly / monthly

Slit lamp –> hypoxia/previous pathology

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. O2 & H20 content considerations
A

O2
- increased WT = increased O2 transmission

H2O content
- if lens drying up = increasing H2O content draws out H2O

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. Decision on material
A
  • hydrogen/silicone hydrogel
  • Rx range
  • cost
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. process of choosing starting lens
A

BOZR calc
- flattest K x 1.1
- fit slightly flatter than flattest K

Adjusting Rx for BOZR
- K=F/(1-dF)
- F=Rx d=BVD (in metres)

Use topic lenses when = cyl > 1.00D

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

Steps for inserting SCL

A
  • px head against chair, facing up
  • lower bottom lid, px looks away
  • place lens onto conj, keep holdings lids, px looks left/right/up/down
  • massage top lid if air bubbles
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Steps for removing SCL

A
  • same eyelid control
  • px looks away
  • slide SCL off cornea
  • pinch off the conj
  • perform health check
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What to record for fitting

A
  • coverage
  • centration
  • movement on blink
  • comfort
  • lag
  • sag
  • push up
  • tightness
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why does lens need to fit well

A
  • comfort
  • corneal coverage
  • good centration
  • movement on blink
  • optimal tightness
  • stable vision
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Characteristics of a steep fit vs flat fit

A

steep = minimal lens movement
flat = increased movement

steep = reduced gimbal crossing
flat = poor contraption

steep = vision improves immediately post blink
flat = variable vision

steep = conj identification + redness

flat = buckling at lens edge + lens awareness

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