LASERS in ophthalmology

Question 1

What are the four damage processes used in ophthalmology?

Answer 1

1) Photo-ablation
2) Plasma-induced ablation
3) Photodisruption
4) Thermal

Question 2

Clinical example of photoablation and laser used?

Answer 2

LASIK surgery = corneal reshaping
UV laser e.g. ArF

Question 3

Clinical example of plasma induced ablation and laser used?

Answer 3

LASEK surgery = corneal reshaping
fs IR laser e.g. Ti-Al203

Question 4

Clinical example of photo-disruption and laser used?

Answer 4

Iridotomy - puncture iris to drain fluid
Green laser e.g. Nd-YAG + KTP

Question 5

Clinical example of photo-coagulation and laser used?

Answer 5

Treat retinopathy
Green laser e.g. Nd-YAG + KTP

Question 6

Numerical aperture equation?

Answer 6

NA=sqrt(ncore^2 - nclad^2)
= nsin(theta_max)