激光桥正视力手术正式版课件.ppt
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1、LASIK Procedure,Alex Lam Yuk Ming,CUHK FAA THOMAS CHEUNG SECONDARY SCHOOL,LASIK ProcedureAlex Lam Yuk Mi,What is LASIK ?,L,A,S,K,aser,eratomileusis,in- tu,I,ssisted,What is LASIK ?LASKasereratomi,To see clearly, light rays are focused on the retina by both the cornea (clear front portion of the eye)
2、 and the lens of the eye.,Normal Refraction,To see clearly, light rays are,In a nearsighted (myopic) eye, light rays from objects are focused in front of the seeing tissue of the eye (the retina), causing images - particularly at distance - to be blurred.,Short-sighted,In a nearsighted (myopic) eye,
3、When the microkeratome has been appropriately positioned onto the surface of the eye, the blade can then engage superficial corneal tissue and begin to construct a partial thickness corneal flap.,Beginning position of Microkeratome,When the microkeratome has bee,A suction ring is placed on the eye a
4、nd a microkeratome placed in the track of the suction ring. As the blade of the microkeratome moves across the cornea, a flap of corneal tissue, about one third depth is created with an opening at one end.,Microkeratome Cutting Position 1,A suction ring is placed on th,When the microkeratome has tra
5、veled most of the way across the cornea, an automatic “stopper prevent the corneal flap from being cut off and leaves a hinged flap.,Microkeratome Cutting Position 2,When the microkeratome has t,Once the superficial corneal flap is created by the microkeratome, it is then gently lifted aside using a
6、 smooth-tipped instrument.,Reflection of Lamellar Flap,Once the superficial corneal f,After lifting the hinged flap aside, the corneal bed is inspected for smoothness, gently cleaned, and moistened slightly to prepare it for the application of the excimer laser treatment.,Prepared Corneal Bed,After
7、lifting the hinged flap,The excimer laser beam, after being preprogrammed for the appropriate correction is applied to the corneal bed under the flap.,Laser of Bed Stage 1,The excimer laser beam, after,Laser energy being applied to deeper layer of cornea.,Laser of Bed Stage 2,Laser energy being appl
8、ied to,Laser treatment of deeper cornea nearly completed.,Laser of Bed Stage 3,Laser treatment of deeper corn,Following laser treatment for nearsightedness, the profile of the treated deeper layer of the cornea shows flattening of the center.,Configuration of Corneal Bed following Laser,Following la
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- 激光 视力 手术 正式版 课件
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