Keratoconus ectasia detection with the oculus pentacam. Save powerpoint presentations as pdf files office support. Uvariboflavin crosslinking treatment of corneal ectasia. Mar 05, 2014 keratectasia is one of the most feared and dreaded complications of lasik.
Despite the establishment and validation of risk factors to screen patients prior to refractive surgery, corneal ectasia still develops in a small percentage of people. Laser in situ keratomileusis lasik has been used to avoid corneal scarring sometimes seen after surface photorefractive keratectomy prk for myopia corrections of more than. Theories of causation range from transudation of secretions sequestered in ducts dilated from previous pregnancy to primary periductal inflammation. Thinner corneas, younger age, multiple postoperative enhancements, high. Lawless, frcophth, fraco, fracs progressive postlasik keratectasia pplk is a progressive deformation of corneal anatomy that occurs rarely but may have severe consequences. No file size restrictions, no ad watermarks just a free online tool for creating pdfs from your ppt slides.
Light enters the eye through the cornea, which refracts, or focuses, the light rays so that you can see clearly. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Early diagnosis analysis promising for keratectasia. K eratectasia remains one of the most troublesome complications that can arise after laser in situ keratomileusis lasik. Uvariboflavin crosslinking treatment of corneal ectasia the safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Find powerpoint presentations and slides using the power of, find free presentations research about lasik complication ppt. Gatinel, assistant professor of ophthalmology, rothschild ophthalmology foundation, paris. Risk factors associated with keratectasia include thin pre. Reduce the size of your pdf without losing quality. All those returning comments were required to provide disclosure of relevant relationships with industry to have their comments considered. Progressive postlasik keratectasia pplk is a progressive deformation of. Keratectasia following laser in situ keratomileusis in a lowrisk.
Visual loss occurs primarily from irregular astigmatism and myopia, and secondarily from corneal scarring. Pdf corneal ectasia after photorefractive keratectomy. Forme fruste keratoconus, genetic predisposition to keratoconus, low residual stromal bed thickness through high myopia, thin preoperative cornea, or thick lasik flap, and irregular corneal. In a retrospective, noncomparative case series, incidence of corneal ectasia was evaluated in a personal consecutive 6453case series of myopic prk with a minimum followup of 18 months. Corneal ectasia after photorefractive keratectomy prk has only been occasionally reported, and its incidence has not been assessed. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. Decreasing vision after laserassisted insitu keratomileusis lasik history of present illness. Keratoconus kc is a progressive, noninflammatory, bilateral but usually asymmetrical ectatic corneal disease, characterized by paraxial stromal thinning and weakening that leads to corneal surface distortion. Corneal ectasia post lasik complication new treatment info.
The rate of ectasia after lasik is estimated to be about one in 2,000, but this number could be an underestimate due to underreporting and lack of longterm followup after lasik. It highlights our incomplete knowledge of the risk factors for keratectasia. If the laser removes too much tissue during lasik or the flap made too deep, the structure of the cornea can be weakened. Keratectasia is one of the most feared and dreaded complications of lasik. Our online pdf to powerpoint converter is the best available, and you can use it free. In my experience, the odds that an eye with a corneal thickness of 500. Dec 20, 2006 corneal ectasia after photorefractive keratectomy prk has only been occasionally reported, and its incidence has not been assessed. The exact risk for postlasik ectasia is unknown and difficult to estimate, given advances in lasik technology and treatment protocols. Transform jpg, png, bmp, gif, and tiff images to pdf. Convert word, powerpoint and excel files to and from pdf.
Keratectasia following excimer laser photorefractive keratectomy. Name of a coronary artery assigned not according to the site of origin or proximal course. Altered stromal remodeling and late keratectasia 2 biomechanical process. Keratorefractive surgery initial and followup evaluation. Wait for the conversion process to finish and download files either one by one, using thumbnails, or in a zip archive. Extract images from your pdf or save each page as a separate image. Scribd is the worlds largest social reading and publishing site. Pdf iatrogenic keratectasia after phototherapeutic keratectomy. Keratectasia definition of keratectasia by medical. An introduction to understanding elevationbased topography. Congenital corneal disorders free download as powerpoint presentation. Corneal ectasia also called kerectasia or keratectasia is an infrequent but serious complication of lasik surgery. Vesiculobullous reaction pattern early lesions should always be biopsied to ensure that a histopathological diagnosis can be made once regeneration of the epidermis commences or secondary changes such as infection or ulceration occur, accurate diagnosis of a vesiculobullous lesion may not always be possible.
The purpose of the registry is to identify risk factors that are not currently known and to serve as a basis for clinical trials in the future, said dr. A side by side comparison of the raw elevation maps from three different corneas shows that adequate qualitative com. Corneal ectatic disorders or corneal ectasia are a group of uncommon, noninflammatory, eye disorders characterised by bilateral thinning of the central, paracentral, or peripheral cornea keratoconus, a progressive, noninflammatory, bilateral, asymmetric disease, characterized by paraxial stromal thinning and weakening that leads to corneal surface distortion. She reported that after she underwent lasik, the vision in her left eye was great and. Convert and create pdf from various types of files like word doc, excel xls, powerpoint ppt. Select the pdf file you want to convert to powerpoint. Keratectasia is a welldescribed and relatively rare complication of corneal refractive surgery, especially following laserassisted in situ keratomileusis lasik, which results in a high degree of myopic astigmatism leading to a decrease in the corrected distance visual acuity cdva. Currently, most diagnostic and classification criteria for keratectasia programs are based only on an. Keratectasia definition of keratectasia by medical dictionary. Keratectasia after laserassisted subepithelial keratectomy. Patients with this complication present with an increase in myopia and astigmatism, loss of uncorrected visual acuity, and often a loss of bestcorrected visual acuity due to progressive corneal steepening that takes place centrally or inferiorly.
Corneal biomechanics in iatrogenic ectasia and keratoconus. Keratoectasia definition of keratoectasia by medical. People can view the slides even if they dont have powerpoint, but they cant make changes to it. Raw elevation maps generated using data from a normal cornea a a mild cone b and an advanced cone c. Pdf converter is a online webbased document to pdf converter software. Listing a study does not mean it has been evaluated by the u.
Thinner corneas, younger age, multiple postoperative. Iatrogenic keratectasia after phototherapeutic keratectomy british. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Laser in situ keratomileusis lasik has been used to avoid corneal scarring sometimes seen after surface photorefractive keratectomy prk for myopia corrections of more than 6.
Definition defined as discontinuation in normal epithelial surface of cornea associated with mecrosis of the surrounding corneal tissue bacterial corneal ulcer etiology damage to corneal epithelium infection of eroded area pathogenesis the development corneal ulcer is in 4 stages 2. Keratoconus it is a clinical entity characterized by noninflammatory and noninfective, progressive, bilateral thinning of the cornea with ectasia of conical shape. Keratectasia is a welldocumented complication of laser in situ keratomileusis. A registry for reporting cases of ectasia after lasik had its debut recently. Editor,several cases of iatrogenic keratectasia have been reported after laser in situ keratomileusis lasik. Accuracy of orbscan ii slitscanning elevation topography. We present a case of unilateral iatrogenic keratectasia developing 10 months after bilateral. We also attempted to evaluate the relative contributions of these factors to the development of ectasia following refractive surgery. Attendees will learn from the experts about crosslinking cxl protocols and management, including how to define the progression of keratoconus, when to retreat a patient with suspected progression after cxl, and when to refer to a cornea specialist. Descemet s membrane and endothelium are absent, and a uveal lining is present except in keratectasia. Ectasia after lasik american academy of ophthalmology. Corneal ulcer free download as powerpoint presentation. Pdf editor,several cases of iatrogenic keratectasia have been reported after laser in situ keratomileusis lasik.
Keratoconus kc is a disorder of the eye which results in progressive thinning of the cornea. Select the target conversion format, then upload up to 20 documents of supported input formats. Keratoconus is an uncommon condition in which the normally round, domelike cornea the clear front window of the eye becomes thin and develops a conelike bulge. D associate professor of ophthalmology labbafinejad medical center november 2006. Keratectasia after laser in situ keratomileusis lasik. Classifi cations and patterns of keratoconus and keratectasia. Corneal ectasia after photorefractive keratectomy springerlink. Keratectasia definition of keratectasia by the free dictionary. Apr 15, 2015 iatrogenic ectasias occur primarily through postcorneal refractive surgery. Corneal ectasia ppp american academy of ophthalmology. Studies suggest it may occur in roughly one of every 2,000 lasik procedures.
Ppt viral keratitis powerpoint presentation free to. Keratoectasia definition of keratoectasia by medical dictionary. Corneal collagen crosslinking in postlasik keratectasia. The cornea is variably thinned and scarred and the anterior segment disorganized, with. Remaining uploaded pdf or ppt files will be deleted automatically. The appearance and progression of postlasik ectasia are similar to a degenerative disease of the cornea called keratoconus. Keratectasia after laser in situ keratomileusis lasik farid karimian m.
Disease keratoconus is a degenerative noninflammatory disease of the cornea where the central or paracentral cornea undergoes progressive thinning and steepening causing irregular astigmatism. Keratoconus articles case reports symptoms treatment, ireland. Lamellar keratoplasty lkp is an alternative surgical procedure that requires removal of only the damaged or diseased epithelium and stroma, leaving the endothelium intact, in cases where only the more superficial layers are damaged. Our pdf to powerpoint converter will turn your pdf into ppt in seconds. Identifying and managing progression in keratoconus. Instantly convert text documents, presentations, spreadsheets and images to pdf format with this free online pdf converter.
Uvcxl is the only procedure that is believed to slow the progression of keratoconus. Mar 29, 2011 uvariboflavin crosslinking treatment of corneal ectasia the safety and scientific validity of this study is the responsibility of the study sponsor and investigators. In the publish as pdf or xps dialog box, choose a location to save the file to. Postoperative corneal ectasia has been estimated to occur in 0. In more severe cases a scarring or a circle may be seen within the cornea while the cause is unknown, it is believed to occur due to a combination of genetic. Download the ppt file and save it to your computer. Ectasia is a dilation of ducts with loss of elastin in duct walls and the presence of chronic inflammatory cells, especially plasma cells, around duct walls. This is mostly bilateral condition, girls between 15 20 years affected more, overall incidence rate estimated to be 0.
Keratectasia definition of keratectasia by the free. This may result in blurry vision, double vision, nearsightedness, astigmatism, and light sensitivity. Iatrogenic keratectasia after laser in situ keratomileusis. It is used to increase the rigidity of the cornea by inducing additional crosslinks within or between collagen fibers using uva light and a photomediator, riboflavin, with the goal of slowing, possibly stabilizing, and even perhaps reversing, the progression of. Pressure inside the eye called intraocular pressure iop, which pushes on the back surface. Keratectasia is an insidious complication of laser in situ keratomileusis lasik, occurring months after an apparently uncomplicated procedure.
Does twitter have a place in health care practices. Oct 17, 2018 ultraviolet corneal collagen crosslinking. This 56yearold woman presented status post bilateral lasik for myopia at an outside institution. In the international literature related to the post prk keratectasia, its incidence is rather low 34 5 678, and it may run from some months to several years after the treatment, in. Risk profiles of ectasia after keratorefractive surgery. Iatrogenic ectasias occur primarily through postcorneal refractive surgery. When you save presentation as a pdf file it freezes the formatting and layout. Click create pdf xps document, then click create pdf xps. Lamellar keratoplasty an overview sciencedirect topics. View and download powerpoint presentations on lasik complication ppt. Request pdf classifi cations and patterns of keratoconus and keratectasia classification of kc is the first step in approaching the disease because the. Keratectasia is a welldescribed and relatively rare complication of corneal refractive surgery, especially following laserassisted in situ keratomileusis lasik.