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Laser Settings Flashcards

1
Q

What procedure is used for Post-Cataract Opacification

A

Nd:YAG Posterior Capsulotomy

1064 nm

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2
Q

What is the tissue reaction for Nd:YAG posterior capsulotomy?

A

Photodisruption

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3
Q

What is the tissue endpoint for Nd:YAG Posterior Capsulotomy?

A

cleavage of PCO

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4
Q

What is the initial energy/Power for Nd:YAG Posterior Capsulotomy?

A

1.3-1.8 mJ

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5
Q

Spot size and duration are both _________ for Nd: YAG Posterior Capsultomy

A

fixed

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6
Q

What is the posterior offset for Posterior Capsulotomy?

A

150-250 microns

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7
Q

What do we keep the total energy under for posterior capsulotomy?

A

40 mJ

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8
Q

What is the follow up schedule for posterior capsulotomy?

A

1 hr; 1-4 weeks

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9
Q

What are the pre-op meds for posterior capsulotomy?

A

brimonidine and dilation

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10
Q

What are the post-op meds for posterior capsulotomy?

A

Brimonidine in office; Pred forte qid x1 week

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11
Q

What size should be targeted for posterior capsulotomy?

A

slightly larger than undilated pupil in dim illumination

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12
Q

What pattern is used in posterior capsulotomy?

A

cruciate

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13
Q

What laser(s) are used for Argon Laser Trabeculoplasty?

A

Argon or FD Nd:YAG (532 nm)

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14
Q

Which laser procedures are used for Open-Angle Laser Therapies

A

Argon Laser Trabeculoplasty (ALT); Selective Laser Trabeculoplasty (SLT)

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15
Q

What is the tissue reaction for ALT?

A

photocoagulation

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16
Q

what is the tissue endpoint for ALT?

A

small bubble formation, pigment blanching

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17
Q

Initial Energy/ Power for ALT?

A

600 mW

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18
Q

Which 2 procedures have a spot size of 50 microns?

A

argon laser trabeculoplasty; argon peripheral iridotomy

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19
Q

What is the duration for ALT?

A

0.1 sec

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20
Q

How many laser procedures have an offset? Name them

A

1; Nd:YAG posterior capsulotomy

150-250 microns posterior offset

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21
Q

How many shots should we use for ALT?

A

50-55 burns per 180 degrees

12-14 per mirror

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22
Q

What is the follow up schedule for both ALT and SLT

A

1 hr, 1 week, 6 weeks

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23
Q

What are the pre-op meds for ALT and SLT?

A

brimonidine; 1% pilocarpine

pilocarpine is optional

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24
Q

What are the post op meds for ALT? Which other procedure(s) use the same ones?

A

brimonidine in office; pred forte qid x1 week; PI, ALPI; Nd:YAG Posterior Capsulotomy

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25
How far apart should burns be for ALT?
1-2 spot sizes apart
26
Where should burns be placed for ALT?
the junction of pigmented and non-pigmented TM
27
When should power be decreased for ALT/ SLT?
increased pigment | increase power for decreased pigment
28
What laser(s) are used for selective laser trabeculoplasty?
argon or FD Nd: YAG (532 nm)
29
What is the tissue reaction for SLT?
photostimulation
30
What is the tissue end point for S LT?
small bubble formation
31
What is the initial energy/power for SLT?
0.8-1.0mJ
32
What is the spot size for SLT?
400 microns
33
What is the duration for SLT?
3 nanoseconds
34
How may shots are used for SLT?
45-60 burns per 180 degrees (12-15 burns per mirror)
35
What are the post-op meds for SLT?
brimonidine in office; anti-inflammatory by doctor preference: ketorolac qid x5 days; pred forte qid x5 days; topical NSAID prn x2 days | can use as needed or not at all
36
How far apart are burns placed for SLT?
right next to one another
37
Where do we aim the laser for SLT?
laser spot aimed over the entire TM
38
What laser are used for argon peripheral iridotomy?
argon or fd ND:YAG (532 nm)
39
what is the tissue reaction for argon peripheral iridotomy?
photocoagulation
40
What is the tissue endpoint for argon peripheral iridotomy?
pigment plume, patent iridotomy 0.5- 1.0mm
41
What is the initial energy/ power for argon peripheral iridotomy?
600-1200 mW
42
What is the spot size for argon peripheral iridotomy?
50 microns
43
waht is the duration for argon peripheral iridotomy?
0.1-0.2 sec
44
What should we keep total energy under for peripheral iridotomy? | argon and Nd:YAG
100-150 mJ per visit
45
which laser procedures have a 1 hr and 1 week follow-up?
PI, ALPI | argon PI, Nd:YAG PI
46
Which procedures do we aim for the iris crypts?
Argon Peripheral Iridotomy; Nd: YAG Peripheral Iridotomy | ~2/3 into the periphery
47
What location should be avoided when performing a PI?
12:00
48
Why do we want to have a completely exposed iridotomy?
least reports of dysphotopsia
49
What is the tissue reaction for an Nd:YAG peripheral iridotomy? | 1064 nm
photodisruption
50
What laser is used for Argon Laser Peripheral Iridoplasty?
Argon or FD Nd:YAG (532 nm)
51
What is the tissue reaction for ALPI?
Photocoagulation
52
What is the tissue endpoint for ALPI?
stromal contraction of peripheral iris
53
What is the initial energy/ power for ALPI?
200-300 mW
54
What is the spot size for ALPI?
500 microns
55
What is the duration for ALPI?
0.5 seconds
56
How many shots for ALPI?
20-25 burns per 360 degrees (~6 burns per quadrants)
57
Where do we place burns for ALPI?
far periphery (overlying iris root)
58
When do we decrease power when performing ALPI?
When there is a bubble formation/ pigment release
59
What are the Narrow-Angle Laser Therapies | there are 3 of them
Argon Peripheral Iridotomy, Nd:YAG Peripheral Iridotomy; Argon Laser Peripheral Iridoplasty
60
Which are the open-angle laser therapies? | there are 2
Argon Laser Trabeculoplasty (ALT); Selective Laser Trabeculoplasty (SLT)

Lasers Final (4 decks)

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