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Final version lasik ppt
- 1. by Gary Allen &Dona Do
- 4. 1) Retina 2) Cones& Rods 3) Fovea Centralis 4) Macular Plaque 5) Optic Nerve
- 7. What isit? Who gets it? Why would you want it? What are the risks? What are the benefits? How expensive is it?
- 8. Refractive surgeryis the correcting of a refractive error by changing the shape of the cornea with surgery.
- 10. Objects atdistance are blurry & difficult to see. Objects at proximity more clearly defined. Corrected by Convex lenses as shown on diagram C & D
- 11. Difficulty seeingclearly at close distances Objects at a distance more easily discernable. Corrected by Convex lenses as shown on diagram A & B
- 12. Irregular curvatureof the eye (shaped more like football than basketball) Light in different planes focuses at different points
- 13. Flattening thecornea decreases myopia Increasing the steepness of the cornea decreases Hyperopia Making the cornea more spherical decreases Astigmatism All of these are correctable to some greater or lesser degree through refractive surgeries
- 14. There arethree types of surgery available utilizing Laser, Incision procedures or intraocular implants Laser: Incision LASIK RK & AK PRK Intraocular LTK IOL
- 16. A flapis cut in the anterior cornea A laser is applied to the stroma underneath The flap is then replaced Pro- can treat large refractive errors shorter healing time than PRK Local anesthetic (out patient procedure) Con-cost price ranges from $2,500-$1,000
- 17. Central Epitheliumis Removed Laser is applied to bowman’s membrane Local anesthetic used 30 seconds of laser exposure Pro- can treat large refractive errors Con- greater laser exposure longer healing time than LASIK.
- 18. Less commonprocedure LTK treats mild far-sightedness and also provides a means of treating presbyopia (age-induced farsightedness) Uses heat to steepen cornea Pro- lower incidence of complications for LTK than with LASIK, with less than 1% adverse events Con- only used to treat mild presbyopia
- 20. RK= Radialkeratotomy for myopia AK= Astigmatic keratotomy for astigmatism Incisions in cornea heal causing reshaping of eye Pro-can be done in poorer countries Con- higher risk of complications, less effective, obsolete
- 21. Phakic Intraocularlenses Implanted into eye without removing the natural lens Refractive lens-ectomy Natural lens is removed from eye and replaced with intraocular lens PRO- for high myopia and cataracts Con- cost upwards of $1500 per eye.
- 23. 1) Must havehad no vision changes for at least two years 2) No underlying corneal abnormalities 3) No use of contact lenses prior to surgery
- 24. Some anti-inflammatory medicationsare required Possibility of infection based on procedure Sunglasses outside are recommended for the first two weeks Eye rubbing can cause damage Some problems with glare can be noticed Vision can be improved to 20/20 or greater but there is no guarantee of perfect vision. Over time the corneal shape can gradually change requiring the need of glasses for reading this usually happens to candidates over 40-50 years of age.
- 25. What isit? Who gets it? Why would you want it? What are the risks? What are the benefits? How expensive is it? The evolution in correction of vision Any one who fits criteria & wants better vision Very small 0.1-0.9% have some form of complications Benefits include improved vision to greater or lesser degree. Prices Range $1000-$2500 per eye