19 Unlike photocoagulation, they do not depend on pigment absorption of radiation. Moderate Exposure + Moderate Intensity = PHOTOTHERMAL Interaction (heat coagulation i.e. Excimer photoablation was performed in a 6.0-6.5 mm optical zone; 4) outcome: dry eye parameters. Energy is concentrated in time and space to create . Photoablation Photodisruption Photocoagulation . This is a concise presentation for medical students (espec. . Decreased risk of induced astigmatism after LASIK. known as photoablation that is produced by excimer lasers. Helium neon laser penetrates 0.5 . Punctal Occlusion Dilation & Irrigation Cyst incision and evacuation Corneal debridement Corneal foreign body removal Due to the small penetration depth, the excimer laser can treat the cornea surface and modulate its shape by photoablation with a submicron-precision. Photodisruption starts with a process called laser induced optical break-down (LIOB), which occurs when conditions of high frequency laser pulses are highly focused with short duration and applied through a small beam laser diameter . It is a flapless procedure in which an intrastromal lenticule is created between two photodisruption planes and removed mechanically from an arcuate side cut of 3 to 4 mm . 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. Lasers - Laser Tissue Interactions Flashcards - Quizlet C. PHOTODISRUPTION (PHOTOIONIZING): Here laser is applied to the target tissue. 20- Photoablation and Photodisruption. US9427356B2 - Photodisruptive laser fragmentation of tissue - Google ... In some embodiments of the retinal IDM invention described herein, laser tissue removal procedures including, but not limited to, laser photodisruption, photoionization or photodissociation and/or laser photoablation devices and methods [including, but not limited to, Small Incision Lenticule Extraction (SMILE), Laser In-Situ Keratomileusis . In photocoagulation, laser light is absorbed by the target tissue or by neighboring tissue, generating heat that denatures proteins (i.e., coagulation). Effective clinical use of lasers requires an understanding of the three basic light-tissue interactions as follows: (1) photocoagulation, (2) photodisruption, and (3) photoablation. Individual laser pulses are focused in the corneal stroma, where plasma expansion leads to localized . A shorter pulse (200-500 fs) needs lower energy to achieve the threshold of photodisruption than a longer pulse (500-1300 fs). . It is a flapless procedure in which an intrastromal lenticule is created between two photodisruption planes and removed mechanically from an arcuate side cut of 3 to 4 mm . A femtosecond (10-15 seconds) is one quadrillionth, or one millionth of one billionth of a second.

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