Quickly Search Information on Lasik

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Quickly Search Information on Lasik

her-order aberrations" are visual problems that require special testing for dia gnosis and are not corrected with normal spectacles (eyeglasses). These aberrat ions include 'starbursts', 'ghosting', 'halos' and others.[23] Some patients desc ribe these symptoms post-operativ 3xh .ely and associate them xh.[ with the LASIK technique i nclu hding the formation of the flap and t i3xh .he tissue ablation.[24] The advancement of the LASIK technology has reduced the risk of clinically significant visual impair ment after surgery xh.[citation needed] There is a correlation between pupil size and aberrationThis correlation may be the result of irregularity in the corneal ti etween the untouched part of the cornea i3xh . and the res di3xh .haped part. Daytime post-LAS IK vision is optimal, since the pupil size is smaller than the LASIK flap. However, at night, the pupil may dila 3xh .te such that light passes through the edge of xh.[the LASIK flap wh ich gives 3xh . rise to aberrations. LASIK and h PRK may induce spherical aberration if the laser under corrects as it moves outward from the centre of the treatment zone, especially when major corrections are ey can be measured in micrometers (µm) whereas the smalles t laser beam size approved by the FDA is about 1000 times larger, at 0.65 mm. In situ kerat omileusis ef xh.[fected at a later age increases the incidence of corneal higher-order wavefront aberrationsThese factors demonstrate the importance of careful patient selecti 3xh .on for LASIK treatment. VBritish National Health Service's National Institute fo hr Health and Clinical Excellence (NIC E) considered evidence of h the effectiv xh.[eness and the potential risks i3xh .of the laser surgery sta ting "current evidence suggests that photorefractive (laser) suvcrgery for the correction of r efractive e i3xh .rrors is safe and efficacious for use in appropriately selected patients. Clinici ans undertaking photorefractive (laser) surgery for the correction of refractive errors should ensure that patients understand the benefits and potential risks of the procedure. Risks inclu de failure t xh.[o achieve the expected improvement in unaided vision, development of new visual di sturbances, corneal i3xh . infection and di3xh .hflap complications. These risks should be h weighed against t hose of wearing spectacles or contact lensesThe FDA reports "Th f refractive surgery for the correction of myopia, hyperopia, and as xh.[tigmatism. The LASIK surg ery is 3xh .[ performed by an ophthalmologist who uses a laser or microkeratome to reshape the eye's c ornea in order to improve v hisual acuityFor most patients, LASIK provides a permanent alter native to eyeglasses or contact lenses LASIK is most similar to another surgical corrective procedure, photorefractive keratectomy (PR K), and both represent advances over radial keratotomy in the surgical treatment of refractive errors of vision. For patients with moderate to high h myopia or thin corneas which cannot be tre ated with LASIK and PRK, the phakic intraoc i3xh .ular lens is an alternver 11 million LASIK procedures had been performed in the United Stamillion