Variables affecting rigid contact lens comfort in the collaborative longitudinal evaluation of keratoconus (CLEK) study.
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; CLEK STUDY GROUP.
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