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CROSS LINKING PLUS: COMBINATION TREATMENT FOR KERATOCONUS Andreja Veselica, Franc Šalamun Medical Centre Vid, Nova Gorica, Slovenia
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CROSS LINKING PLUS Adjuvant REFRACTIVE TREATMENT in combination with CXL TREATMENT IMPROVED FUNCIONAL VISION TISSUE SAVING APPROACHES: 1. CORNEAL RINGS 2. TORIC IOL 3. CONDUCTIVE KERATHOPLASTY TISSUE REMOVAL APPROACHE: PRK CORNEAL BIOMECHANICAL STABILITY
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CLINICAL OUTCOME AFTER CXL + PRK PROCEDURE The purpose of our study was to evaluate visual acuity and topographic outcome after the CXL+PRK surgery, and to compare our results with the data from the literature Retrospective analysis of operating and medical records of patients operated with CXL + PRK between 2008 and 2016
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CLINICAL OUTCOME AFTER CXL + PRK PROCEDURE - RESULTS 37 eyes were submitted to CXL + PRK procedure between 2008 and 2016 26 eyes with progressive and stable keratoconus were enrolled in the study Mean age - 32,5 years (from 14 to 56 years) Mean follow up - 35 mouths (from 5 to 77 mouths) Pre operative mean cornea thickness at the thinnest point 459,39 µm (393- 543 µm) Mean ablation stromal depth 28,37 µm ( 15-50 µm )
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CLINICAL OUTCOME AFTER CXL + PRK PROCEDURE VISUAL ACUITY OUTCOME - UDVA STUDYPRE OPERATIVE UDVA (logMAR) POST OPERATIVE UDVA (logMAR) Salamun et al.0.7 (0.2)0.4 (0.4) Kymionis et al.0.99 (0.1)0.16 (0.7) Kanellopoulus et al.0.8 (0.18)0.3 (0.59) Allesio et al.0.6 (0.25)0.19 (0.6)
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CLINICAL OUTCOME AFTER CXL + PRK PROCEDURE VISUAL ACUITY OUTCOME - BCVA STUDYPRE OPERATIVE BCDA (logMAR) POST OPERATIVE BCVA (logMAR) Salamun et al.0.5 (0.3)0.1 (0.8) Kymionis et al.0.21 (0.6)0.11(0.8) Kanellopoulus et al.0.2 (0.62)0.1(0.82) Allesio et al.0.06(1.0)0.03 (1.0)
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TOPOGRAPHIC OUTCOME – reduction in mean K value CXL Non randomized studies: Between 0.01 AND 3D Randomized study: between 0.6D AND 2D PRK + CXL Non randomized studies: between 2.5 and 3.5 D Randomized studies: 2D Mean reduction in our study: 3.5D No progression – mean follow up 3 years
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VISUAL ACUITY OUTCOME – CXL + PRK VS. CXL Photorefractive keratectomy followed by cross-linking versus cross-linking alone for management of progressive keratoconus- two-years follow-up (Giovanni Aessio, Milena l’Abbate, Carlo Sborgia, and Maria Gabriella la tegola ) Graph showing change in UDA in logMAR unit during postoperative follow-up in eyes treated by PRK/CXL group; deep gray line; n [ 17) and in eyes treated by CXL alone (CXL group; light gray line; n [ 17) for progressive keratoconus. Graph showing change in manifest refraction spherical equivalent (MRSE) during postoperative follow-up in PRK/CXL group; deep gray line; n [ 17) and in CXL group; light gray line; n [ 17) for progressive keratoconus. Diopters (D) ± standard deviation. mo(s) [ month(s); Preop [ before surgery. CXL + PRK: UDVA 〉 0.5 17.6% to 82.3% CXL: 17% UDVA 〉 0.5 unchanged
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OUR PROTOCOL - PRK 7mm mechanical removal of the epithelium within the cone Laser photoablation of 4.5 mm optical zone, flattening the area of the cone – myopic ablation Ablation depth less then 50 μm 6.0 mm phototherapeutic keratectomy to remove 5 μm of stroma
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Impregnation of cornea with 0.1% riboflavin according to standard Dresden protocol Altered Dresden protocol: Radiation within the cone Customized 3mW/cm2 UVA (VEGA emitter) radiation reducing the radiation zone from 7 to 5 mm within the cone oxygen OUR PROTOCOL - CROSS LINKING
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CLINICAL CASES
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6 years follow up UDVA 0.1 0.7 BCVA 0.5 1.0 K mean △ 5.6 stable
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CONCLUSION CXL + PRK have shown to be safe and effective – 5 years follow up CXL + PRK have shown to arrest the progression and improve visual function – topographic regularization and HOA reduction Simultaneous CXL + PRK have shown better outcome then sequential procedure
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SUBJECT OF DEBATE Should we treat progressive and non progressive disease ? Age? Simultaneous or sequential procedure Maximal ablation depth 50 microns Minimal corneal thickness 400-500 microns
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52 years old Stable keratoconus + cataract PRK + CXL + IOL UDVA 0.1 1.0 K mean △ 3D
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LITERATURE Kanellopoulos AJ, Binder PS. Collagen cross-linking (CCL) with sequential topography-guided PRK; a temporizing alterna- tive for keratoconus to penetrating keratoplasty. Cornea 2007; 26:891–895 Kymionis GD, Portaliou DM, Diakonis VF, Kontadakis GA, Krasia MS, Papadiamantis AG, Coskunseven E, Pallikaris AI. Posterior linear stromal haze formation after simultaneous pho- torefractive keratectomy followed by corneal collagen cross- linking. Invest Ophthalmol Vis Sci 2010; 51:5030–5033. Available at: http://www.iovs.org/content/51/10/5030.full.pdf. Accessed December 15, 2014 Stojanovic A, Zhang J, Chen X, Nitter TA, Chen S, Wang Q. Topography-guided transepithelial surface ablation followed by corneal collagen cross-linking performed in a single com- bined procedure for the treatment of keratoconus and pellucid marginal degeneration. J Refract Surg 2010; 26:145–152 Alessio G, L’Abbate M, Sborgia C, La Tegola MG. Photorefrac- tive keratectomy followed by cross-linking versus cross- linking alone for management of progressive keratoconus: two-year follow-up. Am J Ophthalmol 2013; 155:54–65 Kymionis GD, Kontadakis GA, Kounis GA, Portaliou DM, Karavitaki AE, Magarakis M, Yoo S, Pallikaris IG. Simulta- neous topography-guided PRK followed by corneal collagen cross-linking for keratoconus. J Refract Surg 2009; 25:S807– S811. Kanellopoulos AJ. Comparison of sequential vs same-day simultaneous collagen cross-linking and topography-guided PRK for treatment of keratoconus. J Refract Surg 2009; 25(9):S812–S818. O’Brart DPS, Chan E, Samaras K, Patel P, Shah SP. A rando- mised, prospective study to investigate the efficacy of riboflavin/ ultraviolet A (370 nm) corneal collagen cross-linkage to halt the progression of keratoconus. Br J Ophthalmol 2011; 95:1519– 1524. Available at: http://bjo.bmj.com/content/95/11/1519.full. pdf?sidZa585cf27-23ec-4a1a-be48- cdf9597f5584. Accessed December 15, 2014 Wittig-Silva C, Whiting M, Lamoureux E, Lindsay RG, Sullivan LJ, Snibson GR. A randomized controlled trial of corneal collagen cross-linking in progressive kerato- conus: Preliminary results. J Refract Surg 2008; 24:S720–S725 Hersh PS, Greenstein SA, Fry KL. Corneal collagen crosslink- ing for keratoconus and corneal ectasia: one-year results. J Cataract Refract Surg 2011; 37:149–160 Wittig-Silva C, Chan E, Islam FMA, Wu T, Whiting M, Snibson GR. A randomized, controlled trial of corneal collagen cross- linking in progressive keratoconus: three-year results. Ophthalmology 2014; 121:812–821
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THANK YOU FOR YOUR ATTENTION WE HAVE STOPPED THE PROGRESSION YEAH, BUT MY VISION IS STILL BAD
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