Properties of Laser
PI MDC
Polariztion
Intensity
Monochromacity
Directionality
Coherence
Explain Monochromacity
meaning single wavelength because
Selective absorption → different eye tissues absorb different wavelengths (e.g., hemoglobin absorbs green argon better than IR).
Predictable tissue effect → allows precise cutting, coagulation, or reshaping.
Minimal collateral damage → because surrounding tissues that don’t absorb that wavelength remain unaffected.
Explain Directionality
Travel in one single beam not spread > precise
Explain Intensity and what is continuos and pulse laser
Most important property
= Power in beam
Continue : Argon Krypton > watts
Pulse : Nd:Tag : Joules
Explain polariztion
Wavelength vibrate in one plane
Explain Coherence
light are in same phase result in precision
List Iris laser procedure indication and type
PI : Closure Glaucoma : Nd:Yag + Argon
Iridoplasty : Plateau Iris : Argon
Pupilloplasty : Breakiong PAS : Argon
List Sclera laser indication and type
Scleroplasty : POAG : Holmium Yag
Laser Suture lysis : Afer Tx : Yag
List angle laser procedure indication and type
ALT : Refract POAG : Argon
Pseudoexfoliation
Pigment dispersion
SLT : Argon
List CB laser indication and type
List Anterior Vitreous face
CPC :NVG UVG : Diode , NdYag
Laser Vitreolysis : Malignant glaucoma : NdYag
Name all Laser tissue interaction and Mechanism
4PT
Photochemical
Thermal interaction
Photocoagulation
Photodisruption
Plasma induced ablation
Explain Photochemical interaction
Laser only affect in dye tissue
PDT indications ( Verteporfin ) : ACPR , NV AMD , CSC , PCV , Retinal cappillary hemangioblastoma
Crosslinking ( Riboflavin )
Vasularize cornea : Rose Bengal + Green argon laser
explain Thermal ablation
Heat destroy tissue
Photocoagulation
Laser type : GRYI
Explain Photoablation
Explain photo induced ablation
Lasik
Flap opening : plasma induced
Ablation excimer laser : photoablation
Explain photodisruption
Dye in photochemical interaction
Verteporfin
Red Bengal
Riboflavin
Example of photochemical interaction
PDT
CXL
Vasularized Cornea
Laser type in thermal interaction
GRYI
Explain photocoagulation tissue absorption
Opthalmic application of Thermal interaction
PRP
Retinal Break
Laser Iridotomy
Laser Trabeculoplasty
Example of Photoablation
PRK Lasik
( Split molecules )
Example of Plasma induced ablation
FLEx
Example of Photodisruption
YAG Capsulotomy
