Laser corrective vision surgery

Clarity of vision depends upon how puff up cornea and lens permit rays to fall on to the retina on cones and rods. Light rays refract and bend on to focus on to the retina to form a plunder image. There are two photoreceptors cones (which color sensitive) and rods (which is dim light sensitive). These steer signals to brain though optic nerve. If the shape of the cornea is abnormal light does not fall properly or proper image is not form on the back of cornea. (Fletcher, 2007) This is called refractive error.This can be corrected by refractive cognitive function. Refractive errors include myopia (nearsightedness), hyperopia (farsightedness), astigmatism (an on an illegal basis shaped cornea which ca theatrical roles blurring), and presbyopia (similar to hyperopia, a condition which causes the lens to harden). Refractive oculus operating theatre helps to reduce or eliminate a persons dependency on eye glaze or contact lenses. (NYP, 2007) There are several(prenominal) types o f refractive surgery proper diagnostics can only determine which is infallible by whom.It can well be stated that compared with surface ablation, LASIK results in earlier and faster improvement of uncorrected visual acuity, and has less(prenominal)(prenominal) (or nigh no) postoperative discomfort, im turn out stability, and predictability. (Agingeye, 2007) At the same note it can similarly be stated that with LASIK, however, the risks of flap-related complications (wrinkles, debris, folds, buttonhole, and diffuse lamellar keratitis) may be associated with the creation of the lamellar flap. (Agingeye, 2007)Precautions of optical maser correction surgeries are1) Eyes should be healthy2) Patient should be adult3) Stable vision for a year or so.4) If enceinte surgery should be performed on after evaluating the shape of corneas.5) Should not pee-pee Degenerative or autoimmune diseases. (Allaboutvision, 2007) most of risks in LASIK are1) Some patients lose vision2) Some patients develop debilitating visual symptoms.3) irregular astigmatism, which can decrease the corrected vision4) corneal haze or glare5) overcorrected or undercorrected vision6) inability to wear contact lenses in the future7) loss of the corneal flap, requiring a corneal graft8) scarring9) infection (Roberts, 2007)10) vision loss11) develop severe dry eye syndrome12) bit Astigmatism13) Keratectasia14) Night Vision Problems or Night Glare and Halos15) important Islands16) Epithelial IngrowthDiffuse Lamellar Keratitis (DLK) (Banerjee, 2005)Lasik has its benefits too. It is performed under a protective layer of corneal tissue. As a result, there is less surface area to heal, less risk of scarring, less risk of corneal haze, less postoperative discomfort, less postoperative need for medications, and vision returns more rapidly, often within a day or so. It can an also treat a higher(prenominal) range of vision errors. (Grochmaleye, 2007)One testimony to this is available from the US militar y. It is stated that the U.S. military also has adopted widespread use of refractive surgery including LASIK to decrease reliance of troops on artificial lenses or eyewear as evidenced by the more than 16,000 U.S. Army personnel who underwent refractive surgery from 2000 through 2003. Studies of these outcomes showed that 86% achieved 20/20 or better uncorrected vision and 98% achieved 20/40 or better, which legally is considered darling enough for driving without eyewear or contact lenses. (Allaboutvision, 2007)Some Statistics are in this context can be stated as followsPatient Results triple Months After Treatment Procedure 20/20 or discover 20/40 or Better LASIK for myopia 42.0% to 84.8% 76.8% to 99.4% LASIK for hyperopia 48.8% to 58.3% 93.4% to 98.3% PRK for myopia and hyperopia* 67% (approximate) 95% (approximate) (AAO, 2007) In conclusion it can be stated that the method acting has both positive and negative aspects. It should be remembered that the use of laser was approve d by the FDAs Medical Devices Advisory delegation in the context of the Ophthalmic Devices Panel and the effectiveness and safety was proved with the help of various clinical studies. (FDA, 2007)The FDA evaluated several case studies on the method and after analysis of 1,013 eyes LASIK performances that was carried out in thirteen centers of medicament over the period of half year it was found that of the 1,013 eyes treated, 92 percent were corrected to 20/40 or better and 47 percent were corrected to 20/20 or better without glasses or contact lenses. (FDA, 2007) However, in accordance to FDA it could be stated that short side effects included pain (for 24 to 48 hours), corneal swelling, double vision and light sensitivity. In some patients these effects lasted for several weeks.(FDA, 2007) Thus this could be termed as a well tested process but it needs more time and application to become a complete water-tight method. It could be stated that more work on the give in is necessary. ReferencesAmerican Academy of Ophthalmology (2007) Ophthalmology Report 2007 Sydney Allied PublicationsAllaboutvision (2007) Lasik Criteria allaboutvision.com retrieved on 10.02.2008 from http//www.allaboutvision.com/visionsurgery/lasik-criteria.htmAllaboutvision (2007) Lasik complication allaboutvision.com retrieved on 10.02.2008 from http//www.allaboutvision.com/visionsurgery/lasik_complication_1.htmBanerjee, D (2007) Details from Medical Journals of AIIMS New Delhi AIIMSFletcher, R (2007) Medical Principals Beliefs and noesis Believing and Knowing Dunedin Howard PriceGrochmaleye (2007) Lasik benefits grochmaleye.com retrieved on 10.02.2008 from http//www.grochmaleye.com/lasik_benefits.html