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    • Barr JT, Zadnik K, Gordon MO, Edrington TB, McMahon TT, Everett DF, the CLEK Study Group. 1999. "Estimating incident corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study." Abstract. Optom Vis Sci (Suppl), 76: 213.
    • Edrington TB, Gundel RE, Libassi DP, Wagner H, Pierce GE, Walline JJ, Barr JT, Wilson BS, Gordon MO, the CLEK Study Group. 1999. "The effect of rigid contact lens peripheral clearance on patient comfort in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study." Abstract. Optom Vis Sci (Suppl), 76: 210.
    • Pierce GE, Barr JT, Edrington TB, Gordon MO, Jeandervin M, Flom RE, Fink BA, Zadnik K, the CLEK Study Group. 2000. "A technique to improve the agreement between two methods of evaluating cornea-to-contact lens base curve fluorescein patterns in the CLEK Study." Abstract. Optom Vis Sci (Suppl), 77: 225.
    • Pierce GE, Fink BA, Barr JT, Edrington TB, Schechtman KB, Jeandervin M, Flom R, Zadnik K, the CLEK Study Group. 2000. "A comparison of two methods of evaluation cornea-to-contact lens base curve fluorescein patterns in keratoconus." Abstract. Invest Ophthalmol Vis Sci, 41 (suppl): S72.
    • Shen JF, McMahon TT, Cheng EL, Sugar J, Yue BYJT, Anderson R, Begley C, Zhou Z, the CLEK Study Group. 2000. "Lysosomal hydrolase staining of impression cytology specimens in keratoconus." Abstract. Invest Ophthalmol Vis Sci, 41 (suppl): S271.
    • Zadnik K, Schechtman KB, Nichols JJ, Fink BA, Tyler J, Rosenstiel CE, Steger-May K, the CLEK Study Group. 2000. "Asymmetry in keratoconus." Abstract. Invest Opthalmol Vis Sci, 41 (suppl): S678.
    • Zadnik K, Schechtman KB, Nichols JJ, Fink BA, Tyler J, Rosenstiel, Shin JA, Joslin CE, Steger-May K, the CLEK Study Group. 2000. "Disease asymmetry in keratoconus." Abstract. Optom Vis Sci (Suppl), 77: 117.
    • Barr JT, Gordon MO, Wilson BS, Zadnik K, Edrington TB, McMahon TT, Everett DF, the CLEK Study Group. 2001. "Factors associated with incident corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study." Abstract. Invest Ophthalmol Vis Sci, 42: S83.
    • BA Fink, JT Barr, G Pierce, G Mitchell, JJ Nichols, A Sup, LM Badowski, G Nixon. 2002. "The Evaluation of Cornea-to-contact Lens Base Curve Relationships In Keratoconus Through Fluorescein Pattern Analysis." Abstract. Invest Ophthalmol Vis Sci, 43: E-Abstract 3226.
    • BA Fink, JT Barr, G Pierce, G Mitchell, JJ Nichols, A Sup, LM Badowski, G Nixon. 2002. "Repeatability of Fluorescein Pattern Assessment in Keratoconus." Abstract. Optom Vis Sci (Suppl), 79: 133.
    Send email to Dr. Gregory Nixon
    Associate Professor-Clinical
    Phone:   (614) 292-5367
    U.S. Postal Address:
     Dr. Gregory Nixon
    The Ohio State University
    College of Optometry
    338 W. 10th Ave
    Columbus, OH 43210-1280