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Administrator   Firstname: Marc Gender:  Joined: 28 Aug 2004 Posts: 29422 Chats: 11081 Location: Hennef  | Typically, the cornea is avascular, because it must be transparent to function normally, its cells absorbing oxygen from the tear film. Thus, low oxygen-permeable contact lenses reduce the cornea's oxygen absorption, sometimes resulting in corneal neovascularization—the growth of blood vessels into the cornea. This causes a slight lengthening of inflammation duration and healing time and some pain during surgery, because of greater bleeding. Although some contact lenses (notably modern RGP and soft silicone hydrogel lenses), are made of materials with greater oxygen permeability that help reduce the risk of corneal neovascularization, patients considering LASIK are warned to avoid over-wearing their contact lenses. Usually, it is recommended that they discontinue wearing contact lenses days or weeks before the LASIK eye surgery. A 2004 Wake Forest University study established that heat and humidity affect LASIK surgery results, both during the procedure and in the two weeks before the surgery.[38] | ||
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| Similar Topics | Author | Replies | Views | Last Post | |
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 | Refractive surgery Refractive eye surgery is any eye surgery used to improve the refractive state of the eye and decrease dependency on glasses or contact lenses. This can include various methods of surgical remodelling of the cornea or cataract surgery. The most common... [ General ] | mgutt | 0 | 186 | 07.08.2007, 00:28  mgutt |
| Other Refractive surgery procedures Thermal keratoplasty is used to correct hyperopia by putting a ring of 8 or 16 small burns surrounding the pupil, and steepen the cornea with a ring of collagen constriction. It can also be used to treat selected types of astigmatism.
Laser thermal... [ General ] | mgutt | 0 | 319 | 07.08.2007, 00:30 mgutt |
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