Optics & Photonics News Magazine January Issue . Tammy Pifer Than, MS, OD, FAAO UAB School of Optometry tthan@uab.edu. Tissue effects Thermal effect: Photocoagulation (Argon, Diode & Krypton) Photovaporization (CO2 , Erbium YAG & Holmium YAG) Ionizing effect: Photodisruption (Nd YAG) Chemical effect: Photoablation (Excimer) Lasers in glaucoma 1. photoablation and photodisruption. Because power is a function of energy per unit time, shorter pulse times further decrease energy output for a given effect [10]. c. Photoablation: high-powered ultraviolet light exceeds covalent bond strength of target protein precisely removing a submicron layer. 3d), demonstrating our ability to resulted in venous pooling and rapid cardiac remodeling) and control and optimize the insult that is produced. 1. EE8094Part3_1(AY2020-21).pdf - Course Hero Photodisruption is a process in which high-peak-power, ionizing laser pulses are used to disrupt tissue. . While focused on the starting point, the laser beam is pulsed to disrupt a . 2020-2021 BCSC Basic and Clinical Science Course™ Decreased risk of corneal abrasions during surgery. Photochemical Laser Applications: Photoablation and Photodynamic ... The application of many photons of laser energy at the same place and time leads to a nonlinear absorption of . Punctal Occlusion Dilation & Irrigation Cyst incision and evacuation Corneal debridement Corneal foreign body removal Glaucoma 38. Cataracts 38. photodisruption: [ fo″to-dis-rup´shun ] disruption of tissues by laser-produced rapid ionization of molecules. Soft tissue photo-thermal ablation (or photovaporolysis) is a process of vaporization of intra- and extra-cellular water. Helium neon laser penetrates 0.5 . Excimer laser Photoablation The excimer Lasers produce UV light, that hits tissue , then the Collagen molecules become excited and absorb photons & heat up, that lead to: breaking of hydrogen bonds of tissue water, so water expand and undergoes a phase transition into hot gas & burst out that burst out includes the tissue protein. Photoablation: here laser in the far ultraviolet wavelength (350 nm) is used. pumping efficiency decreased … The type of laser- tissue interaction depends on the power density (W/cm2) and exposure time (s) (8). The greater the number of laser spots and the . . Photodisruption: Carbon dioxide: 10,600: Photothermal: Nd . Femtosecond lasers produce a different tissue interaction, however, known as photodisruption (Figure 1). Excimer photoablation was performed in a 6.0-6.5 mm optical zone; 4) outcome: dry eye parameters. Photoablation It uses high-energy ultraviolet photons to break covalent chemical bonds. 20- Photoablation and Photodisruption.

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