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Review

Refractive surgery or contact lenses – how and when to decide?

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Pages 63-72 | Published online: 11 Nov 2011

References

  • Pearson R. Karl Otto Himmler, manufacturer of the first contact lens. Cont Lens Anterior Eye. 2007;30(1):11–16.
  • Nicolson PC, Vogt J. Soft contact lens polymers: an evolution. Biomaterials. 2001;22(24):3273–3282.
  • Kunzler JF. Silicone hydrogels for contact lens application. TRIP. 1996;4:52–59.
  • Paragon Vision Sciences. Premarket approval application supplement #P870024/S43. Jun 2002. Available from: http://www.accessdata. fda.gov/cdrh_docs/pdf/P870024S043b.pdf. Accessed October 25, 2011.
  • Bausch & Lomb/Euclid. Premarket approval application #P010062/S001/ S002. Jun 2004. Available from: http://www.fda.gov/MedicalDevices/ ProductsandMedicalProcedures/DeviceApprovalsandClearances/ PMAApprovals/ucm110901.htm. Accessed October 25, 2011.
  • Dart JK, Radford CF, Minassian D, Verma S, Stapleton F. Risk factors for microbial keratitis with contemporary contact lenses: a case-control study. Ophthalmology. 2008;115(10):1647–1654.
  • Kugler LJ, Hill S, Sztipanovits D, Boerman H, Swartz TS, Wang MX. Corneal melt of incisions overlying corneal ring segments: case series and literature review. Cornea. 2011;30(9):968–971.
  • Mimura T, Fujimura S, Yamagami S, et al. Severe hyperopic shift and irregular astigmatism after radial keratotomy. Eye Contact Lens. 2009;35(6):345–347.
  • Levy J, Hirsh A, Klemperer I, Lifshitz T. Late-onset Pseudomonas keratitis after radial keratotomy and subsequent laser in situ keratomileusis: case report and literature review. Can J Ophthalmol. 2005;40(2):211–213.
  • Ren DH, Yamamoto K, Ladage PM, et al. Adaptive effects of 30- night wear of hyper-O(2) transmissible contact lenses on bacterial binding and corneal epithelium: a 1-year clinical trial. Ophthalmology. 2002;109(1):27–39.
  • Seiler T, McDonnell PJ. Excimer laser photorefractive keratectomy. Surv Ophthalmol. 1995;40(2):89–118.
  • Alessio G, Boscia F, La Tegola MG, Sborgia C. Topography-driven photorefractive keratectomy: results of corneal interactive programmed topographic ablation software. Ophthalmology. 2000;107(8):1578–1587.
  • Hersch PS, Brint SF, Maloney RK, et al. Photorefractive keratectomy versus laser in situ keratomileusis for moderate to high myopia. A randomized prospective study. Ophthalmology. 1998;105(8):1512–1523.
  • McDonald MB, Deitz MR, Frantz JM, et al. Photorefractive keratectomy for low-to-moderate myopia and astigmatism with a small-beam, tracker-directed excimer laser. Ophthalmology. 1999;106(8):1481–1488.
  • Carones F, Gobbi PG, Vigo L, Brancato R. Photorefractive keratectomy for hyperopia: long-term nonlinear and vector analysis of refractive outcome. Ophthalmology. 1999;106(10):1976–1983.
  • Pop M, Payette Y. Photorefractive keratectomy versus laser in situ keratomileusis: a control-matched study. Ophthalmology. 2000;107(2):251–257.
  • Hersch PS, Stulting RD, Steiner RF, et al. Results of phase III excimer laser photorefractive keratectomy for myopia. The Summit PRK Study Group. Ophthalmology. 1997;104(10):1535–1553.
  • Krueger RR, Saedy NF, McDonnell PJ. Clinical analysis of steep central islands after excimer laser photorefractive keratectomy. Arch Ophthalmol. 1996;114(4):377–381.
  • Alio JL, Artola A, Claramonte PJ, Ayala MJ, Sanchez SP. Complications of photorefractive keratectomy for myopia: two year follow-up of 3000 cases. J Cataract Refract Surg. 1998;24(5):619–626.
  • Kurtz RM, Horvath C, Liu HH, et al. Lamellar refractive surgery with scanned intrastromal picosecond and femtosecond laser pulses in animal eyes. J Refract Surg. 1998;14(5):541–548.
  • Pallikaris IG, Papatzanaki ME, Stathi EZ, Frenschock O, Georgiadis A. Laser in situ keratomileusis. Lasers Surg Med. 1990;10(5):463–468.
  • Buratto L, Ferrari M, Genisi C. Myopic keratomileusis with the excimer laser: one-year follow up. Refract Corneal Surg. 1993;9(1):12–19.
  • Yoo SH, Azar DT. Laser in situ keratomileusis for the treatment of myopia. Int Ophthalmol Clin. 1999;39(1):37–44.
  • Gimbel HV, Penno EE, van Westenbrugge JA, Ferensowicz M, Furlong MT. Incidence and management of intraoperative and early postoperative complications in 1000 consecutive laser in situ keratomileusis cases. Ophthalmology. 1998;105(10):1839–1848.
  • Kezirian GM, Stonecipher KG. Comparison of the IntraLase femtosecond laser and mechanical keratomes for laser in situ keratomileusis. J Cataract Refract Surg. 2004;30(4):804–811.
  • Binder PS. Flap dimensions created with the IntraLase FS laser. J Cataract Refract Surg. 2004;30(1):26–32.
  • Camellin M. Laser epithelial keratomileusis for myopia. J Refract Surg. 2003;19(6):666–670.
  • Fong CS. Refractive surgery: the future of perfect vision? Singapore Med J. 2007;48(8):709–719.
  • Litwak S, Zadok D, Garcia-de Quevedo V Robledo N, Chayet AS. Laser-assisted subepithelial keratectomy versus photorefractive keratectomy for the correction of myopia. A prospective comparative study. J Cataract Refract Surg. 2002;28(8):1330–1333.
  • Rouweyha RM, Chuang AZ, Mitra S, Phillips CB, Yee RW. Laser epithelial keratomileusis for myopia with the autonomous laser. J Refract Surg. 2002;18(3):217–224.
  • Claringbold TV 2nd. Laser-assisted subepithelial keratectomy for the correction of myopia. J Cataract Refract Surg. 2002;28(1):18–22.
  • de Benito-Llopis L, Alió JL, Ortiz D, Teus MA, Artola A. Ten-year follow-up of excimer laser surface ablation for myopia in thin corneas. Am J Ophthalmol. 2009;147(5):768–773.
  • Katsanevaki VJ, Kalyvianaki MI, Kavroulaki DS, Pallikaris IG. Epipolis laser in-situ keratomileusis: an evolving surface ablation procedure for refractive corrections. Curr Opin Ophthalmol. 2006;17(4):389–393.
  • Whittaker G. Are contact lens associated problems a primary motivational factor for PRK patients? J Br Contact Lens Assoc. 1996;19:21–23.
  • Walline JJ, Rah MJ, Jones LA. The Children’s Overnight Orthokera- tology Investigation (COOKI) pilot study. Optom Vis Sci. 2004;81(6):407–413.
  • Soni PS, Nguyen T; Overnight Orthokeratology Study Group. Overnight orthokeratology experience with XO material. Eye Contact Lens. 2006;32(1):39–45.
  • Soni PS, Nguyen TT, Bonanno JA. Overnight orthokeratology: refractive and corneal recovery after discontinuation of reverse-geometry lenses. Eye Contact Lens. 2004;30(4):254–262.
  • Barr JT, Rah MJ, Meyers W, Legerton J. Recovery of refractive error after corneal refractive therapy. Eye Contact Lens. 2004;30(4):247–251.
  • Berntsen DA, Barr JT, Mitchell GL. The effect of overnight contact lens corneal reshaping on higher-order aberrations and best-corrected visual acuity. Optom Vis Sci. 2005;82(6):490–497.
  • Caroline PF, Andre MP. Fitting corneal reshaping post-LASIK. Contact Lens Spectrum. Apr 2004. Available from: http://www.clspectrum.com/ article.aspx?article= 12559. Accessed October 25, 2011.
  • Sorbara L, Fonn D, Simpson T, Lu F, Kort R. Reduction of myopia from corneal refractive therapy. Optom Vis Sci. 2005;82(6):512–518.
  • Hiraoka T, Matsumoto Y, Okamoto F, et al. Corneal higher-order aberrations induced by overnight orthokeratology. Am J Ophthalmol. 2005;139(3):429–436.
  • Watt K, Swarbrick HA. Microbial keratitis in overnight orthok- eratology: review of the first 50 cases. Eye Contact Lens. 2005;31(5):201–208.
  • Wilhelmus KR. Acanthamoeba keratitis during orthokeratology. Cornea. 2005;24(7):864–866.
  • Tseng CH, Fong CF, Chen W, Hou YC, Wang IJ, Hu FR. Overnight orthokeratology-associated microbial keratitis. Cornea. 2005;24(7):778–782.
  • Hsiao CH, Lin HC, Chen YF, et al. Infectious keratitis related to overnight orthokeratology. Cornea. 2005;24(7):783–788.
  • Yepes N, Lee SB, Hill V et al. Infectious keratitis after overnight orthokeratology in Canada. Cornea. 2005;24(7):857–860.
  • Araki-Sasaki K, Nishi I, Yonemura N, et al. Characteristics of Pseudomonas corneal infection related to orthokeratology. Cornea. 2005;24(7):861–863.
  • Sun X, Zhao H, Deng S, et al. Infectious keratitis related to orthokeratology. Ophthalmic Physiol Opt. 2006;26(2):133–136.
  • Henriques M, Sousa C, Lira M, et al. Adhesion of Pseudomonas aeruginosa and Staphylococcus epidermidis to silicone-hydrogel contact lenses. Optom Vis Sci. 2006;82(6):446–450.
  • Bruinsma GM, van der Mei HC, Busscher HJ. Bacterial adhesion to surface hydrophilic and hydrophobic contact lenses. Biomaterials. 2001;22(24):3217–3224.
  • Doughty MJ, Aakre BM, Y stenaes AE, Svsrverud E. Short-term adaptation of the human corneal endothelium to continuous wear of silicone hydrogel (lotrafilcon A) contact lenses after daily hydrogel lens wear. Optom Vis Sci. 2005;82(6):473–480.
  • Lipson MJ, Sugar A, Musch DC. Overnight corneal reshaping versus soft disposable contact lenses: vision-related quality-of-life differences from a randomized clinical trial. Optom Vis Sci. 2005;82(10):886–891.
  • Rah M, Bailey M, Hayes J, et al. Comparison of NEI RQL-42 scores in LASIK vs CRT patients. Invest Ophthalmol Vis Sci. 2004;45:E-Abstract 1578.
  • Lee YC, Lim CW, Sam SM, Koh D. The prevalence and pattern of contact lens use in a Singapore community. CLAO J. 2000;26(1):21–25.
  • Riley C, Chalmers RL. Survey of contact lens-wearing habits and attitudes toward methods of refractive correction: 2002 versus 2004. Optom Vis Sci. 2005;82(6):555–561.
  • Donshik PC. Extended wear contact lenses. Ophthalmol Clin North Am. 2003;16(3):305–309.
  • Schornack MM, Faia LJ, Grienpentrog GJ. Pseudomonas keratitis associated with daily wear of silicone hydrogel contact lenses. Eye Contact Lens. 2008;34(2):124–128.
  • Suchecki JK, Donshik P, Ehlers WH. Contact lens complications. Ophthalmol Clin North Am. 2003;16(3):471–484.
  • Liu Z, Pflugfelder SC. The effects of long-term contact lens wear on corneal thickness, curvature, and surface regularity. Ophthalmology. 2000;107(1):105–111.
  • Budak K, Hamed AM, Friedman NJ, Koch DD. Preoperative screening of contact lens wearers before refractive surgery. J Cataract Refract Surg. 1999;25(8):1080–1086.
  • Wang X, McCulley JP, Bowman RW, Cavanagh HD. Time to resolution of contact lens-induced corneal warpage prior to refractive surgery. CLAO J. 2002;28(4):169–171.
  • Hartstein J. Corneal warping due to wearing of corneal contact lenses. A report of 12 cases. Am J Ophthalmol. 1965;60(6):1103–1104.
  • Asbell PA, Wasserman D. Contact lens-induced corneal warpage. Int Ophthalmol Clin. 1991;31(2):121–126.
  • Braun DA, Anderson Penno EE. Effect of contact lens wear on central corneal thickness measurements. J Cataract Refract Surg. 2003;29(7):1319–1322.
  • Nourouzi H, Rajavi J, Okhovatpour MA. Time to resolution of corneal edema after long-term contact lens wear. Am J Ophthalmol. 2006;142(4):671–673.
  • Myrowitz EH, Melia M, O’Brien TP. The relationship between longterm contact lens wear and corneal thickness. CLAO J. 2002;28(4):217–220.
  • Gupta N, Naroo SA. Factors influencing patient choice of refractive surgery or contact lenses and choice of centre. Cont Lens Anterior Eye. 2006;29(1):17–23.
  • Migneco MK, Pepose JS. Attitudes of successful contact lens wearers towards refractive surgery. J Refract Surg. 1996;12(1):128–133.
  • Salah T, Waring GO 3rd, el Maghraby A, Moadel K, Grimm SB. Excimer laser in situ keratomileusis under a corneal flap for myopia of 2 to 20 diopters. Am J Ophthalmol. 1996;121(2):143–155.
  • Dulaney DD, Barnet RW, Perkins SA, Kezirian GM. Laser in situ keratomileusis for myopia and astigmatism: 6 month results. J Cataract Refract Surg. 1998;24(6):758–764.
  • Buzard KA, Fundingsland BR. Excimer laser assisted in situ keratomileusis for hyperopia. J Cataract Refract Surg. 1999;25(2):197–204.
  • Zadok D, Maskaleris G, Montes M, Shah S, Garcia V, Chayet A. Hyper- opic laser in situ keratomileusis with the Nidek EC-5000 excimer laser. Ophthalmology. 2000;107(6):1132–1137.
  • Lindstrom RL, Linebarger EJ, Hardten DR, Houtman DM, Samuelson TW. Early results of hyperopic and astigmatic laser in situ keratomileusis in eyes with secondary hyperopia. Ophthalmology. 2000;107(10):1858–1863.
  • Sakimoto T, Rosenblatt MI, Azar DT. Laser eye surgery for refractive errors. Lancet. 2006;367(9520):1432–1447.
  • Munnerlyn CR, Koons SJ, Marshall J. Photorefractive keratectomy: a technique for laser refractive surgery. J Cataract Refract Surg. 1988;14(1):46–52.
  • Katsanevaki VJ, Tuft SJ. Refractive surgery: what patients need to know. Br Med Bull. 2007;83:325–339.
  • El-Maghraby A, Salah T, Waring GO 3rd, Klyce S, Ibrahim O. Randomized bilateral comparison of excimer laser in situ keratomileusis and photorefractive keratectomy for 2.50 to 8.00 diopters of myopia. Ophthalmology. 1999;106(3):447–457.
  • Hatch BB, Moshirfar M, Ollerton AJ, Sikder S, Mifflin MD. A prospective, contralateral comparison of photorefractive keratectomy (PRK) versus thin-flap LASIK: assessment of visual function. Clin Ophthalmol. 2011;5:451–457.
  • US Food and Drug Administration (2006). Available from: http://www. fda.gov/cdrh/LASIK/lasers.htm. Accessed October 25, 2011.
  • Levinger E, Geyer O, Baltinsky Y, Levinger S. Binocular function and patient satisfaction after monovision induced by laser in situ keratomileusis (lasik). Harefuah. 2006;145(3):186–190, 246–247.
  • Jain S, Ou R, Azar DT. Monovision outcomes in presbyopic individuals after refractive surgery. Ophthalmology. 2001;108(8):1430–1433.
  • Miranda D, Krueger RR. Monovision laser in situ keratomileusis for pre-presbyopic and presbyopic patients. J Refract Surg. 2004;20(4):325–328.
  • Goldberg DB. Laser in situ keratomileusis monovision. J Cataract Refract Surg. 2001;27(9):1449–1455.
  • Reilly CD, Lee WB, Alvarenga L, Caspar J, Garcia-Ferrer FJ, Mannis MJ. Surgical monovision and monovision reversal in LASIK. Cornea. 2006;25(2):136–138.
  • Garcia-Gonzalez M, Teus MA, Hernandez-Verdejo JL. Visual outcomes of LASIK-induced monovision in myopic patients with presbyopia. Am J Ophthalmol. 2010;150(3):381–386.
  • McGill EC, Erickson P. Sighting dominance and monovision distance binocular fusional ranges. J Am Optom Assoc. 1991 ;62(10):738–742.
  • Tham VM, Maloney RK. Microkeratome complications of laser in situ keratomileusis. Ophthalmology. 2000;107(5):920–924.
  • Moshirfar M, Gardiner JP, Schliesser JA, et al. Laser in situ keratomileusis flap complications using mechanical microkeratome versus femtosecond laser: retrospective comparison. J Cataract Refract Surg. 2010;36(11):1925–1933.
  • Stulting RD, Carr JD, Thompson KP, et al. Complications of laser in situ keratomileusis for the correction of myopia. Ophthalmology. 1999;106(1):13–20.
  • Linebarger EJ, Hardten DR, Lindstrom RL. Diffuse lamellar keratitis: diagnosis and management. J Cataract Refract Surg. 2000;26(7):1072–1077.
  • Smith RJ, Yadarola MB, Pelizzari MF, Luna JD, Juarez CP, Reviglio VE. Complete bilateral vitreous detachment after LASIK retreatment. J Cataract Refract Surg. 2004;30(6):1382–1384.
  • Luna JD, Artal MN, Reviglio VE, Pelizzari M, Diaz H, Juarez CP Vitreoretinal alterations following laser in situ keratomileusis: clinical and experimental studies. Graefes Arch Clin Exp Ophthalmol. 2001;239(6):416–423.
  • Mirshahi A, Schopfer D, Gerhardt D, Terzi E, Kasper T, Kohnen T. Incidence of posterior vitreous detachment after laser in situ keratomileusis. Graefes Arch Clin Exp Ophthalmol. 2006;244(2):149–153.
  • Arevalo JF, Ramirez E, Suarez E, Cortez R, Ramirez G, Yepez JB. Retinal detachment in myopic eyes after laser in situ keratomileusis. J Refract Surg. 2002;18(6):708–714.
  • Arevalo JF, Mendoza AJ, Velez-Vazquez W, et al. Full-thickness macular hole after LASIK for the correction of myopia. Ophthalmology. 2005;112(7):1207–1212.
  • Arevalo JF, Rodriguez FJ, Rosales-Meneses JL, et al. Vitreoretinal surgery for macular hole after laser assisted in situ keratomileusis for the correction of myopia. Br J Ophthalmol. 2005;89(11):1423–1426.
  • Jabbur NS, Sakatani K, O’Brien TP. Survey of complications and recommendations for management in dissatisfied patients seeking a consultation after refractive surgery. J Cataract Refract Surg. 2004;30(9):1867–1874.
  • Johnson JD, Azar DT. Surgically induced topographical abnormalities after LASIK: management of central islands, corneal ectasia, decentra- tion, and irregular astigmatism. Curr Opin Ophthalmol. 2001;12(4):309–313.
  • Fan-Paul NJ, Li J, Miller JS, Florakis GJ. Night vision disturbances after corneal refractive surgery. Surv Ophthalmol. 2002;47(6):533–546.
  • Hersh PS, Steinert RF, Brint SF Photorefractive keratectomy versus laser in situ keratomileusis; comparison of optical side effects. Summit PRK-LASIK Study Group. Ophthalmology. 2000;107(5):925–933.
  • Condon PI. 2005 ESCRS Ridley Medal Lecture: will keratectasia be a major complication for LASIK in the long term? J Cataract Refract Surg. 2006;32(12):2124–2132.
  • Seiler T, Quurke AW. Iatrogenic keratectasia after LASIK in a case of forme fruste keratoconus. J Cataract Refract Surg. 1998;24(7):1007–1009.
  • Binder PS, Lindstrom RL, Stulting RD, et al. Keratoconus and corneal ectasia after LASIK. J Refract Surg. 2005;21(6):749–752.
  • Randleman JB, Russell B, Ward MA, Thompson KP, Stulting RD. Risk factors and prognosis for corneal ectasia after LASIK. Ophthalmology. 2003;110(2):267–275.
  • Meghpara B, Nakamura H, Marcai M, et al. Keratectasia after laser in situ keratomileusis: a histopathologic and immunohistochemical study. Arch Ophthalmol. 2008;126(12):1655–1663.
  • Dawson DG, Randleman JB, Grossniklaus HE, et al. Corneal ectasia after excimer laser keratorefractive surgery: histopathology, ultrastructure, and pathophysiology. Ophthalmology. 2008;115(12):2181–2191.
  • Ward MA. Visual rehabilitation with contact lenses after laser in situ keratomileusis. J Refract Surg. 2001;17(4):433–440.
  • Chou B, Wachler BS. Soft contact lenses for irregular astigmatism after laser in situ keratomileusis. J Refract Surg. 2001;17(6):692–695.
  • Ailó JL, Belda JI, Shalaby AM. Correction of irregular astigmatism with excimer laser assisted by sodium hyaluronate. Ophthalmology. 2001;108(7):1246–1260.
  • Dupps WJ Jr, Wilson SE. Biomechanics and wound healing in the cornea. Exp Eye Res. 2006;83(4):709–720.
  • Ortiz D, Piñero D, Shabayek MH, Arnalich-Montiel F, Alio JL. Corneal biomechanical properties in normal, post-laser in situ keratomileusis, and keratoconic eyes. J Cataract Refract Surg. 2007;33(8):1371–1375.
  • Chen MC, Lee N, Bourla N, Hamilton DR. Corneal biomechanical measurements before and after laser in situ keratomileusis. J Cataract Refract Surg. 2008;34(11):1886–1891.
  • Kamiya K, Shimizu K, Ohmoto F. Comparison of the changes in corneal biomechanical properties after photorefractive keratectomy and laser in situ keratomileusis. Cornea. 2009;28(7):765–769.
  • Chen SH, Feng YF, Stojanovic A, Wang QM. Meta-analysis of clinical outcomes comparing surface ablation for correction of myopia with and without 0.02% mitomycin C. J Refract Surg. 2011;27(7):530–541.
  • Daoud YJ, Hutchinson A, Wallace DK, Song J, Kim T. Refractive surgery in children: treatment options, outcomes, and controversies. Am J Ophthalmol. 2009;147(4):573–582. e2.
  • Tychsen L. Refractive surgery for special needs children. Arch Ophthalmol. 2009;127(6):810–813.
  • Paysse EA, Coats DK, Hussein MA, Hamill MB, Koch DD. Long-term outcomes of photorefractive keratectomy for anisometropic amblyopia in children. Ophthalmology. 2006;113(2):169–176.
  • Brown SM. Pediatric refractive surgery. Arch Ophthalmol. 2009;127(6):807–809.
  • Nassaralla BR, Nassarralla JJ Jr. Laser in situ keratomileusis in children 8 to 15 years old. J Refract Surg. 2001;17(5):519–524.
  • O’Keefe M, Nolan L. LASIK surgery in children. Br J Ophthalmol. 2004;88(1):19–21.
  • Phillips CB, Prager TC, McClellan G, Mintz-Hittner HA. Laser in situ keratomileusis for treated anisometropic amblyopia in awake, autofixating pediatric and adolescent patients. J Cataract Refract Surg. 2004;30(12):2522–2528.
  • Waring GO 3rd, Lynn MJ, McDonnel PJ. Results of the prospective evaluation of radial keratotomy (PERK) study 10 years after surgery. Arch Ophthalmol. 1994;112(10):1298–1308.
  • Alió JL, Wolter NV, Pinero DP, et al. Pediatric refractive surgery and its role in the treatment of amblyopia: meta-analysis of the peer-reviewed literature. J Refract Surg. 2011;27(5):364–374.
  • Kidd B, Stark C, McGhee CN. Screening for psychiatric distress and low self-esteem in patients presenting for excimer laser surgery for myopia. J Refract Surg. 1997;13(1):40–44.
  • Illingworth CD, Hoh HB, Easty DL. . Introduction to laser refractive surgery. In: Claoue C, editor. Laser and Conventional Refractive Surgery. London: BMJ Publishing Group; 1996:1–20.
  • Orr D, Sidiki SS, McGhee CN. Factors that influence patient choice of an excimer laser treatment center. J Cataract Refract Surg. 1998;24(3):335–340.
  • Montes M, Chayer A, Gomez L, Magallanes R, Robledo N. Laser in situ keratomileusis for myopia of -1.50 to -6.00 diopters. J Refract Surg. 1999;15(2):106–110.
  • Waring GO 3rd. Pediatric refractive surgery review. Arch Ophthalmol. 2009;127(6):814–815.