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Photo of McMahon, Timothy T

Timothy T McMahon, OD, FAAO


Vice-Chair for Optometry

Department of Ophthalmology and Visual Sciences

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Dr. McMahon’s principal research interests are the pathobiology, genetics and clinical management of keratoconus, a degenerative disease of the cornea. His multi-center clinical trials are supported by numerous grants from the National Eye Institute, including the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Corneal Topography Reading Center. Dr. McMahon is a member of the Board of Directors of the American Academy of Optometry and is a Diplomate in the Section on Cornea, Contact Lenses and Refractive Technologies. Dr. McMahon serves on the editorial board for the journals Cornea and Eye & Contact Lens. The National Academies of Practice, an organization of outstanding health care
practitioners dedicated to quality healthcare for all, named him a Distinguished Clinical Fellow. Dr. McMahon sees patients at the Illinois Eye and Ear Infirmary and the Millennium Park Eye Center.

Selected Publications

  • McMahon TT, Irving EL, Lee C. Accuracy and repeatability of self-measurement of interpupillary distance. Optom Vis Sci. 2012 Jun;89(6):901-7. doi: 10.1097/OPX.0b013e318257f37b. PubMed PMID: 22581116.
  • Jansen ME, Chalmers R, Mitchell GL, Kinoshita BT, Lam DY, McMahon TT, Richdale K, Sorbara L, Wagner H. Characterization of patients who report compliant and non- compliant overnight wear of soft contact lenses. Cont Lens Anterior Eye. 2011
    Oct;34(5):229-35. doi: 10.1016/j.clae.2011.01.001. Epub 2011 Feb 22. PubMed PMID: 21345717.
  • Chalmers RL, Wagner H, Mitchell GL, Lam DY, Kinoshita BT, Jansen ME, Richdale K, Sorbara L, McMahon TT. Age and other risk factors for corneal infiltrative and inflammatory events in young soft contact lens wearers from the Contact Lens
    Assessment in Youth (CLAY) study. Invest Ophthalmol Vis Sci. 2011 Aug 24;52(9):6690-6. doi: 10.1167/iovs.10-7018. PubMed PMID: 21527379.
  • Wagner H, Chalmers RL, Mitchell GL, Jansen ME, Kinoshita BT, Lam DY, McMahon TT, Richdale K, Sorbara L; CLAY Study Group. Risk factors for interruption to soft contact
    lens wear in children and young adults. Optom Vis Sci. 2011 Aug;88(8):973-80. doi: 10.1097/OPX.0b013e31821ffe14. PubMed PMID: 21602732.
  • Lam DY, Kinoshita BT, Jansen ME, Mitchell GL, Chalmers RL, McMahon TT, Richdale K, Sorbara L, Wagner H; CLAY Study Group. Contact lens assessment in youth: methods and baseline findings. Optom Vis Sci. 2011 Jun;88(6):708-15. doi: 10.1097/OPX.0b013e3182142396. PubMed PMID: 21423066.
  • Beyer J, Zhao XC, Yee R, Khaliq S, McMahon TT, Ying H, Yue BY, Malicki JJ. The role of crumbs genes in the vertebrate cornea. Invest Ophthalmol Vis Sci. 2010 Sep;51(9):4549-
    56. doi: 10.1167/iovs.09-4549. PubMed PMID: 20805571; PubMed Central PMCID: PMC2941173.
  • McMahon TT, Kim LS, Fishman GA, Stone EM, Zhao XC, Yee RW, Malicki J. CRB1 gene mutations are associated with keratoconus in patients with leber congenital amaurosis. Invest Ophthalmol Vis Sci. 2009 Jul;50(7):3185-7. doi: 10.1167/iovs.08-2886. Epub 2009 Apr 30. PubMed PMID: 19407021.
  • Mahmoud AM, Roberts CJ, Lembach RG, Twa MD, Herderick EE, McMahon TT; CLEK Study Group. CLMI: the cone location and magnitude index. Cornea. 2008 May;27(4):480-7. doi: 10.1097/ICO.0b013e31816485d3. PubMed PMID: 18434854; PubMed Central PMCID: PMC2861357.
  • Butcko V, McMahon TT, Joslin CE, Jones L. Microbial keratitis and the role of rub and rinsing. Eye Contact Lens. 2007 Nov;33(6 Pt 2):421-3; discussion 424-5. Review. PubMed
    PMID: 17975438.
  • Joslin CE, Tu EY, Shoff ME, Booton GC, Fuerst PA, McMahon TT, Anderson RJ, Dworkin MS, Sugar J, Davis FG, Stayner LT. The association of contact lens solution use and Acanthamoeba keratitis. Am J Ophthalmol. 2007 Aug;144(2):169-180. Epub 2007 Jun 22. PubMed PMID: 17588524; PubMed Central PMCID: PMC2692658.

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Notable Honors

2000-present, Distinguished Clinical Fellow, National Academies of Practice, Distinguished Clinical Fellow

2005, Advisory Committee Service Award, US Food and Drug Administration, Advisory Committee Service Award, US Food and Drug Administration


OD: Illinois College of Optometry
Residency in Optometry: Kansas City VA Medical Center