5 Laser Surgery Flashcards
Ophthalmic lasers provide good examples of 3 fundamental laser applications which are?
Total output energy
Output power
Photon energy
What laser application involves thermal effects and photocoagulation?
Total output energy
What laser application is involved with tissue ionization, photo-disruption?
Output power
What laser application breaks molecular bonds, photoblation?
Photon energy
Laser interactions with the eye are used for what:
Cornea?
IRIS?
Retina?
Crystalline lens?
Refractive surgery
Open angle glaucoma, laser trabeculoplasty LTP
Photocoangulation
Laser cataract surgery
How much of an incision is made to create the flap with a femtosecond laser?
120um deep
About 8.5mm wide
(TP) less corneal power means…
Decreased corneal curvature (FLATTER
(TP) to correct myopia, we want more or less optical power?
LESS
What’s the ablation depth equation?
(Optical zone)^2 X myopia correction/3
(TP) to correct hyperopia, we want more or less optical power?
MORE POWAA
(TP) more corneal power means steeper or flatter corneal curvature?
Increased corneal curvature (STEEPER)
For hyperopia, what tissue is removed?
Peripheral tissue
What is the optical zone?
Area where laser is being applied. Should be the size of the scotopic (dilated) pupil
(TP) for the same myopia correction, consider INCREASING the optical zone by a factor of sqrt(2), the maximum ablation depth…
A) remains the same
B) increases by a factor of sqrt(2)
C) Increases by a factor of 2
D) decreases by a factor of sqrt (2)
E) decreases by a factor of 2
C) increases by factor of 2
(TP) two myopic eyes -2.00, -6.00, the maximum ablation depth in the -6.00 eye compared to the -2.00 eye is..
More by factor of 3
less by factor of 3
same??
More by a factor of 3!!
