HIGH INTENSITY LIGHT

LASERS

Lasers are an equipment that use high energy to destroy, or seal tissue

- A laser is an instrument equipped to produce a fine parallel beam of high intensity light, which can be focused on a very small spot.
- The development of surgical lasers, during the last decade, has made a significant contribution to microsurgery.
- Used with an operating microscope or fiberscope a wide range of microsurgical procedures have now become possible, for example, suture less micro vascular anatomists.
- Excision of the posterior capsule of the lens through the transparent cornea.
- Coagulation of bleeding peptic ulcers using a flexible gastro scope.
- In laser surgery, the light beam heats the target tissue and causes:

• Thermal(heat) tissue destruction, first with local edema and then by denaturing of proteins.
• Contraction of tissue due to alteration of fibrous tissue protein and finally boiling of cell water and vaporization.
• Generally, low energy exposure results in coagulation of blood vessel.
• Higher energy exposure produces a precise incision by vaporization of the tissue at the focal point.
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