Bibliography

Peer-Reviewed Publications 
(Current to January 5, 2006; additional manuscripts are in preparation)

Click for pdf copy or Search all CLEK articles in PubMed
1.Zadnik K, Barr JT, Gordon MO, Edrington TB, CLEK Study Group. (1996) Biomicroscopic signs and disease severity in keratoconus. Cornea 15:139-146. LINK
2.Barr JT, Gordon MO, Zadnik K, Pellican K, Edrington TB, and the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. (1996) Photodocumentation of corneal scarring. Journal of Refractive Surgery 12:492-500. LINK
3.Edrington TB, Barr JT, Zadnik K, Davis LJ, Gundel RE, Libassi DP, McMahon, TT, Gordon MO. (1996) A standardized rigid contact lens fitting protocol for keratoconus. Optometry and Vision Science 73:369-375. LINK
4.Gundel RE, Libassi DP, Davis LJ, McMahon TT, Edrington TB, Zadnik K, Barr JT, Gordon MO. (1996) Feasibility of fitting contact lenses with apical clearance in keratoconus. Optometry and Vision Science 73:729-732. LINK
5.Gordon, MO, Schechtman KB, Davis LJ, McMahon TT, Schornack J, Zadnik K, Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. (1998) Visual acuity repeatability in keratoconus: impact on sample size. Optometry and Vision Science 75:249-257. LINK
6.Edrington TB, Szczotka LB, Begley CG, Burger DS, Wilson BS, Barr JT, Zadnik K, Gordon MO, CLEK Study Group. (1998) Repeatability and agreement of two corneal curvature assessments in keratoconus: keratometry and the first definite apical clearance lens (FDACL). Cornea 17:267-277. LINK
7.Zadnik K, Barr JT, Edrington TB, Everett DF, Jameson M, McMahon TT, Sterling JL, Wagner H, Gordon MO, the CLEK Study Group. (1998) Baseline findings in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Investigative Ophthalmology & Visual Science 39:2537-2546. LINK
8.Davis LJ, Schechtman KB, Begley CG, Shin JA, Zadnik K, the CLEK Study Group. (1998) Repeatability of refraction and corrected visual acuity in keratoconus. Optometry and Vision Science 75:887-896.
9.Barr JT, Schechtman KB, Fink BA, Pierce GE, Pensyl CD, Zadnik K, Gordon MO, the CLEK Study Group. (1999) Corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: Baseline prevalence and repeatability of detection. Cornea 18:34-46. LINK
10.Edrington TB, Szczotka LB, Barr JT, Achtenberg JF, Burger DS, Janoff AM, Olafsson HE, Chun MW, Boyle JW, Gordon MO, Zadnik K, and The CLEK Study Group. (1999) Rigid contact lens fitting relationships in keratoconus. Optometry and Vision Science 76:692-699.
11.Barr JT, Zadnik K, Wilson BS, Edrington TB, Everett DF, Fink BA, Shovlin JP, Weissman BA, Siegmund K, Gordon MO, the CLEK Study Group. (2000) Factors associated with corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Cornea 19:501-507. LINK
12.Zadnik K, Barr JT, Edrington TB, Nichols JJ, Wilson BS, Siegmund K, Gordon MO, the CLEK Study Group. (2000) Corneal scarring and vision in keratoconus: a baseline report from the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Cornea 19:804-812. LINK
13.McMahon TT, Anderson RJ, Joslin CE, Rosas GA, and the CLEK Topography Analysis Group. (2001) Precision of three topography instruments in keratoconus subjects. Optometry and Vision Science 78:599-604.
14.Fink BA, Barr JT, Edrington TB, Pierce GE, Schechtman KB, Rah MJ, Flom R, Zadnik K, the CLEK Study Group. (2001) A comparison of two methods of evaluating cornea-to-contact lens base curve fluorescein patterns in keratoconus. Optometry and Vision Science 78:589-598.
15.Szczotka LB, Barr JT, Zadnik K, the CLEK Study Group. (2001) A summary of the findings from the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry. Journal of the American Optometric Association 72:574-587.
16.Raasch TW, Schechtman KB, Davis LJ, Zadnik K, the CLEK Study Group. (2001) Repeatability of subjective refraction in myopic and keratoconic subjects: results of vector analysis. Ophthalmic and Physiological Optics 21:376-383.
17.Edrington TB, the CLEK Study Group. (2002) What the CLEK Study means to you. Review of Optometry 139:61-64.
18.Shen JF, McMahon TT, Cheng EL, Sugar J, Yue BYJT, Anderson RJ, Begley C, Zhou J, for the CLEK Study Group. (2002) Lysosomal hydrolase staining of conjunctival impression cytology specimens in keratoconus. Cornea 21:447-452. LINK
19.Zadnik K, Steger-May K, Fink BA, Joslin CE, Nichols JJ, Rosenstiel CE, Tyler JA, Yu JA, Raasch TW, Schechtman KB, the CLEK Study Group. (2002) Between-eye asymmetry in keratoconus. Cornea 21:671-679. LINK
21.Edrington TB, Gundel RE, Libassi DP, Wagner H, Pierce GE, Walline JJ, Barr JT, Olafsson HE, Steger-May K, Achtenberg J, Wilson BS, Gordon MO, Zadnik K, the CLEK Study Group. (2004) Variables affecting rigid contact lens comfort in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry and Vision Science.81:182-188.
22.Nichols JJ, Steger-May K, Edrington TB, Zadnik K. (2004) The relation between disease asymmetry and severity in keratoconus. British Journal of Ophthalmology 88:788-791.
23.Kymes SM, Walline JJ, Zadnik K, Gordon MO, Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. (2004) Quality of life in keratoconus. American Journal of Ophthalmology 138:527-535.
24.Zadnik K, Barr JT, Edrington TB, McMahon TT, Gordon MO, CLEK Study Group. (2005) Comparison of flat and steep rigid contact lens fitting methods in keratoconus.
Optometry and Vision Science 82:1014-1021.
25.McMahon, TT, Anderson RJ, Roberts C, Mahmoud AM, Szczotka LB, Raasch TW, Friedman NE, Davis LJ, and the CLEK Study Group. Repeatability of corneal topography measurement in keratoconus with the TMS-1. Optometry and Vision Science 2005;82:405-415.
26.Barr JT, Wilson BS, Gordon MO, Rah MJ, Riley C, Kollbaum PS, Zadnik K, CLEK Study Group. Estimation of incidence and factors predictive of corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Cornea. In press.
27.Fink BA, Wagner H, Steger-May K, Rosenstiel C, Roediger T, McMahon TT, Gordon MO, Zadnik K, CLEK Study Group. Differences in keratoconus as a function of gender. American Journal of Ophthalmology. In press. Differences in keratoconus as a function of gender. American Journal of Ophthalmology 2005;140:459-468.
28.Barr JT, Wilson BS, Gordon MO, Rah MJ, Riley C, Kollbaum PS, Zadnik K, CLEK Study Group. (2006) Estimation of the incidence and factors predictive of corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Cornea 25:16-25.
  
 

Abstracts & Presentations

1.Zadnik K, Barr JT, Gordon MO. (1989) Multi-center survey results:trends in keratoconus. American Journal of Optometry and Physiological Optics (Suppl) 66:56P.
2.Zadnik K, Barr JT, Gordon MO, and the CLEK Study Group. (1990) Contact lens fitting trends in keratoconus: Results from the CLEK (Contact Lens Evaluation in Keratoconus) screening study. Optometry and Vision Science 67:46P.
3.Edrington TB, Zadnik K, Barr JT, Gordon MO, and the CLEK Study Group. (1991) Scarring and contact lens fit in keratoconus: results from the CLEK (Contact Lens Evaluation in Keratoconus) Screening Study. Investigative Ophthalmology and Visual Science (Suppl) 32:738.
4.Barr JT, Gordon MO, Zadnik K, Edrington TB, and the CLEK Study Group. (1991) Method for standardizing photographic evaluation of corneal scarring. Investigative Ophthalmology and Visual Science (Suppl) 32:1221.
5.Zadnik K, Gordon MO, Barr JT, Edrington TB, and the CLEK Study Group. (1991) Profile of keratoconus patients undergoing penetrating keratoplasty. Optometry and Vision Science (Suppl) 68:33.
6.Barr JT, Gordon MO, Zadnik K, Edrington TB, and the CLEK Study Group. (1991) Corneal photography and grading of corneal scarring photographs – a standardized procedure. Optometry and Vision Science (Suppl) 68:34.
7.Edrington TB, Barr JT, Zadnik K, Gordon MO, and the CLEK Study Group. (1991) A standardized rigid contact lens fitting protocol for keratoconus. Optometry and Vision Science (Suppl) 68:105.
8.Gordon M, Zadnik K, Morgan D, Barr J, Edrington T, and the Contact Lens Evaluation in Keratoconus Study Group. (1991) Improving estimates of sample yield in clinical trials. Proceedings of the Biopharmaceutical Section of the American Statisical Association 118-123.
9.Gordon MO, Zadnik K, Barr JT, Edrington TB, and the CLEK Study Group. (1991) A low cost screening survey to assess sample yield and refine study entry criteria. Proceedings of the Soc Clin Trials.
10.Barr JT, Gordon MO, Zadnik K, Edrington TB, and the CLEK Study Group. (1992) A standardized procedure for corneal photography and grading of corneal scarring in keratoconus. Investigative Ophthalmology and Visual Science (Suppl) 33:771.
11.Burger DS, Gordon MO, Zadnik K, Barr JT, Edrington TB, and the CLEK Study Group. (1992) A low cost screening survey to assess sample yield and refine study entry criteria. Investigative Ophthalmology and Visual Science (Suppl) 33:863.
12.Edrington TB, Gordon MO, Barr JT, Zadnik K, and the CLEK Study Group. (1992) A standardized method to photodocument and interpret contact lens fluorescein patterns applied to keratoconus. Investigative Ophthalmology and Visual Science (Suppl) 33:1295.
13.Barr JT, Zadnik K, Edrington TB, Gordon MO, and the CLEK Study Group. (1992) Corneal photodocumentation and photograph reading method for the Contact Lens Evaluation in Keratoconus (CLEK)—150 Eye Study. Optometry and Vision Science (Suppl) 69:70.
14.Zadnik K, Barr JT, Edrington TB, Gordon MO, and the CLEK Study Group. (1992) Feasibility of randomizing keratoconus patients to flat versus steep contact lenses. Optometry and Vision Science (Suppl) 69:137 (errata).
15.Edrington TB, Barr JT, Zadnik K, Gordon MO, and the CLEK Study Group. (1992) You can fit steep and we can prove it: a standardized keratoconus fitting and documentation method.Optometry and Vision Science (Suppl) 69:153.
16.Barr JT, Gordon MO, Zadnik K, Edrington TB, and the CLEK Study Group. (1993) Corneal findings in the Contact Lens Evaluation in Keratoconus Screening Study. Investigative Ophthalmology and Visual Science (Suppl) 34:980.
17.Edrington TB, Gordon MO, Zadnik K, Barr JT, and the CLEK Study Group. (1993) Achieving and maintaining a comfortable apical clearance RGP contact lens fit in keratoconus. Investigative Ophthalmology and Visual Science (Suppl) 34:1005.
18.Barr JT, Van Otteren D, Edrington TB, Zadnik K, Gordon MO, the CLEK Study Group. (1993) Prescriber and reader agreement using a standard method to photodocument contact lens fluorescein patterns in keratoconus. Optometry and Vision Science (Suppl) 70:21-22.
19.Zadnik K, Barr JT, Edrington TB, Gordon MO, the CLEK Study Group. (1993) Scarring and visual acuity in keratoconus. Optometry and Vision Science (Suppl) 70:22.
20.Edrington TB, Barr JT, Zadnik K, Gordon MO, the CLEK Study Group. (1993) Selection of initial trial fitting RGP contact lens base curve radius in keratoconus. Optometry and Vision Science (Suppl) 70:39.
21.Edrington TB, Zadnik K, Gordon MO, Barr JT, the CLEK Study Group. (1994) Fellow eyes of corneal grafts are at risk for keratoconus disease progression. Investigative Ophthalmology and Visual Science (Suppl) 35:1359.
22.Barr JT, Gordon MO, Zadnik K, Edrington TB, the CLEK Study Group. (1994) Thirty keratoconus patients randomized to two contact lens treatment methods. Investigative Ophthalmology and Visual Science (Suppl) 35:2164.
23.Barr JT, Zadnik K, Gordon MO, Edrington, TB, the CLEK Study Group. (1994) The Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: Historical data and study design. Optometry and Vision Science (Suppl) 71:33.
24.Barr JT, Gordon MO, Zadnik K, Edrington TB. (1995) Quality of life in keratoconus patients. Investigative Ophthalmology and Visual Science (Suppl) 36: S75.
25.Zadnik K, Barr JT, Gordon MO, Edrington TB, CLEK Study Group. (1995) Standardization of clinical techniques. Optometry and Vision Science (Suppl) 72:15.
26.Zadnik K, Bullimore MA, Barr JT, Gordon MO, Edrington, TB, CLEK Study Group. (1996) Recruitment for a large-scale clinical study via the World Wide Web and the Internet. Investigative Ophthalmology & Visual Science (Suppl): 37:S305.
27.Edrington TB, Barr JT, Zadnik K, Gordon MO, the CLEK Study Group. (1996) A new measure of disease severity in keratoconus. Investigative Ophthalmology & Visual Science (Suppl) 37:S557.
28.Zadnik K, Bullimore MA, Barr JT, Gordon MO, Edrington, TB, CLEK Study Group. (1996) Recruitment for a large-scale clinical study via the World Wide Web and the Internet. Controlled Clinical Trials (suppl) 17:76S.
29.Gordon MO, Everett DF, Zadnik K, Barr JT, Edrington TB, CLEK Study Group. (1996) Procedures for handling criticism and comments from study investigators.Controlled Clinical Trials(Suppl) 17:76S.
30.Zadnik K, Davis LJ, Mcmahon TT, Schornack JA, Gordon MO, the CLEK Study Group. (1996) Repeatability of visual acuity measurement in keratoconus. Optometry and Vision Science (Suppl) 73:68.
31.Edrington TB, Zadnik K, Barr JT, Gordon MO, the CLEK Study Group. (1996) Rigid contact lens fitting relationshiops in keratoconus: standard of care. Optometry and Vision Science (Suppl) 73:230.
32.Barr JT, Zadnik K, Edrington TB, Gordon MO, CLEK Study Group. (1996) Agreement between clinicians and the photograph readers in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry and Vision Science (Suppl) 73:230.
33.Barr JT, Pierce GE, Edrington TB, Zadnik K, Gordon MO, the CLEK Study Group. (1997) Baseline test-retest findings of corneal scarring in the CLEK Study. Investigative Ophthalmology & Visual Science (Suppl) 38:S132.
34.Zadnik K, Gordon MO, Schechtman K, Davis LJ, McMahon TT, Schornack JA, and the CLEK Study Group. (1997) Visual acuity repeatability in keratoconus. Investigative Ophthalmology & Visual Science (Suppl) 38:S845.
35.Szczotka LB, Friedman NE, Davis LJ, McMahon TT, and the CLEK Study Group. (1997) Videokeratographic data quality and disease severity in keratoconus. Investigative Ophthalmology & Visual Science (Suppl) 38:S1090.
36.Zadnik K, Barr J, Edrington T, Gordon M, CLEK Study Group. (1997) Late visit reports to ensure patient retention. Controlled Clinical Trials. 18:102S.
37.Gordon MO, Achtenberg J, Schornack JA, Pensyl CD, Barnhart LA, McMahon TT, Roediger TA, Zadnik K, CLEK Study Group. (1997) Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: quality of life. Optometry and Vision Science (Suppl) 74:94.
38.Davis LJ, Schechtman K, Shin JA, Begley CG, Gordon MO, Zadnik K, CLEK Study Group. (1997) Repeatability of manifest refraction and contact lens over-refraction in keratoconus. Optometry and Vision Science (Suppl) 74:147.
39.Zadnik K, Gordon MO, Wagner H, Sterling JL, Shin JA, Jameson M, Everett DF, CLEK Study Group. (1997) Baseline patient-reported findings from the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry and Vision Science (Suppl) 74:148.
40.Raasch TW, Szczotka LB, McMahon TT, Friedman NE, Davis LJ, CLEK Study Group. (1997) Quantitative features of corneal topography in keratoconus. Optometry and Vision Science (Suppl) 74:148.
41.Edrington TB, Szczotka LB, Begley CG, Burger DS, Wilson BS, Zadnik K, Gordon MO, CLEK Study Group. (1997) Repeatability of two corneal curvature assessments in keratoconus: keratometry and the first definite apical clearance lens. Optometry and Vision Science (Suppl) 74:149.
42.Barr JT, Edrington TB, Zadnik K, Gordon MO, the CLEK Study Group. (1998) Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: baseline demographics and clinical characteristics. Investigative Ophthalmology & Visual Science (Suppl) 39:S67.
43.Davis LJ, Barr JT, Pierce GE, Gordon MO, the CLEK Study Group. (1998) Test-retest reliability of grading the presence of Vogt’s striae and Fleischer’s ring by photography. Investigative Ophthalmology & Visual Science (Suppl) 39:S67.
44.Raasch TW, McMahon TT, Szczotka LB, Friedman NE, Anderson RJ, Davis LJ, the CLEK Study Group. (1998) Fundamental component differences in topography between keratoconic and normal corneas. Investigative Ophthalmology & Visual Science (Suppl) 39:S635.
45.Edrington TB, Szczotka LB, Burger DS, Chun MW, Janoff AM, Olafsson HE, Wilson BS, Gordon MO, the CLEK Study Group. (1998) Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: Rigid contact lens fitting relationships.Investigative Ophthalmology & Visual Science (Suppl) 39:S343
46.Walline JJ, Gordon MO, Edrington TB, Barr JT, Zadnik K, the CLEK Study Group. (1998) Quality of life in keratoconus. Investigative Ophthalmology & Visual Science (Suppl) 39:S668.
47.Zadnik K, Barr JT, Edrington TB, Wilson BS, Nichols JJ, Gordon MO, the CLEK Study Group. (1998) Impact of scarring in keratoconus.Optometry and Vision Science (Suppl) 75:20.
48.Barr JT, Zadnik K, Gordon MO, Edrington TB, McMahon TT, the CLEK Study Group. (1998) Correlates of corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry and Vision Science (Suppl) 75:20.
49.Edrington TB, Barr JT, Schechtman KB, Fink BA, Pierce GE, Pensyl CD, Zadnik K, Gordon MO, the CLEK Study Group. (1998) Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study: Corneal scarring at baseline and repeatability of detection. Optometry and Vision Science (Suppl) 75:21.
50.Walline JJ, Edrington TB, Barr JT, Zadnik K, Gordon MO, the CLEK Study Group. (1998) Health related quality of life in keratoconus. Optometry and Vision Science (Suppl) 75:21.
51.McMahon TT, Anderson RJ, Szczotka LB, Davis LJ, Friedman NE, Raasch TW. (1998) Readability of EyeSys topography data in keratoconus. Optometry and Vision Science (Suppl) 75:22.
52.Raasch TW, Anderson RJ, McMahon TT, Friedman NE, Szczotka LB, Davis LJ, the CLEK Study Group. (1998) Repeatability of topography measurement in keratoconus.Optometry and Vision Science (Suppl) 75:22.
53.McMahon TT, Anderson RJ, Szczotka LB, Davis LJ, Friedman NE, Raasch TW, and the CLEK Study Group: (1998) Readability of EyeSys topography in keratoconus. Optometry and Vision Science (Suppl) 75:22.
54.Merchea MM, Zadnik K, Barr JT, Edrington TB, McMahon TT, Gordon MO, the CLEK Study Group. (1998) The Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Piggyback Feasibility Pilot Study. Optometry and Vision Science (Suppl) 75:157.
55.Barr JT, Gordon MO, Zadnik K, Edrington TB, McMahon TT, Everett DF, and the CLEK Study Group. Incident corneal scaring estimates in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. (1999) Investigative Ophthalmology & Visual Science 40 (suppl):S769.
56.Gordon MO, Beiser JA, Zadnik K, Barr JT, Edrington TB, McMahon TT, and the CLEK Study Group. (1999) Correlation of NEI-Visual Function Questionnaire (VFQ) with clinical measures in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Investigative Ophthalmology & Visual Science 40 (suppl):S769.
57.Edrington TB, Barr JT, Zadnik K, Fink BA, Nichols JJ, Gordon MO, and the CLEK Study Group. (1999) Correlation of corneal scarring with clinical measures and patient outcomes at baseline in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Investigative Ophthalmology & Visual Science 40 (suppl) S911.
58.Barr JT, Zadnik K, Gordon MO, Edrington TB, McMahon TT, Everett DF, the CLEK Study Group. (1999) Estimating incident cornal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optometry and Vision Science (Suppl) 76:213.
59.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. Optometry and Vision Science (Suppl) 76:210.
60.Zadnik K, Schechtman KB, Nichols JJ, Fink BA, Tyler J, Rosenstiel CE, Steger-May K, the CLEK Study Group. Asymmetry in keratoconus. Investigative Ophthalmology & Visual Science 41 (suppl) S678.
61.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 evaluating cornea-to-contact lens base curve fluorescein patterns in keratoconus. Investigative Ophthalmology & Visual Science 41 (suppl) S72.
62.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. Investigative Ophthalmology & Visual Science 41 (suppl) S271.
63.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. Optom Vis Sci (Suppl) 77:117.
64.Pierce GE, Barr JT, Edrington TB, Gordon MO, Jeandervin M, Flom RE, Fink BA, Zadnik, the CLEK Study Group. (2000) A technique to improve the agreement between two methods of evlauating cornea-to-contact lens base curve fluorescein patterns in the CLEK Study. Optom Vis Sci (Suppl) 77:225.
65.Barr JT, Gordon MO, Wilson BS, Zadnik K, Edrington TB, McMahon TT, Everett DF, the CLEK Study Group. Factors associated with incident corneal scarring in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. (2001) Invest Ophthalmol Vis Sci 42:S83.
66.Zadnik K, Barr JT, Edrington TB, McMahon TT, Gordon MO. (2002) Flat vs. steep: the effect of rigid contact lens fitting method in keratoconus. ARVO abstract #3225. LINK
67.McMahon TT, Anderson RJ, Szczotka LB, Roberts C, Mahmoud A, Friedman NE, Davis LJ, Raasch TW, the CLEK Study Group. (2002) The relation between visual acuity and topographic indices in keratoconus. ARVO abstract #142. LINK
68.Barr JT, Zadnik K, Edrington T, McMahon T. (2002) Visual acuity and quality of life after penetrating keratoplasty. Optom Vis Sci 79(Suppl):5.
69.Zadnik K, Schechtman KB, Wilson BA, Barr JT, Edrington TB, McMahon TT, Everett DF, Gordon MO, CLEK Study Group. (2003) Visual acuity loss in keratoconus. ARVO abstract #1308. LINK
70.Nichols JJ, Steger-May KJ, Edrington TB, Zadnik K, CLEK Study Group. (2003) The relation between disease asymmetry and severity in keratoconus. ARVO abstract #1313. LINK
71.Wagner H, Wilson B, Fink B, Zadnik K, CLEK Study Group. (2003) Gender differences in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Optom Vis Sci 80(Suppl):101.
72.Barr J, the CLEK Study Group. (2003) Hybrid contact lens wearers in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. (2003) Optom Vis Sci 80(Suppl):101.
73.Joslin C, Wilson B, Barr JT, Gordon M, Zadnik K. (2003) Clinical outcomes in keratoconus following penetrating keratoplasty. Optom Vis Sci 80(Suppl):221.
74.Kymes SM, Wilson BS, Gordon MO, the CLEK Study Group. (2004) Quality of life and penetrating keratoplasty in patients with keratoconus. Results from the Collaborative Longitudinal Evaluation of Keratoconus (CLEK). ARVO http://www.arvo.org.
75.McMahon TT, Anderson RJ, Szczotka-Flynn LB, Libassi D, Gundel R, Roberts C. Mahmoud AM, the CLEK Study Group. (2004) Gender differences in cone apex location in keratoconus. ARVO http://www.arvo.org.
76.Edrington TB, Joslin CE, Wilson B, Gordon M, Zadnik K, the CLEK Study Group. (2004) Clinical outcomes in keratoconus following penetrating keratoplasty. ARVO abstract http://www.arvo.org.
  
 

CLEK-TAG

1.McMahon TT, Joslin CE, Anderson RJ, Rosas G, the CLEK Topography Analysis Group. (2000) Instrument precision comparisons for three topographers in keratoconus subjects. Optom Vis Sci (Suppl) 77:250.
  
 

Publications by Specific Aims

1.Publications by Specific Aim (PDF)