Keratoconus is a thinning disorder of the central cornea resulting in visual distortion. It is usually treated with rigid contact lenses when spectacles no longer provide adequate vision.
Study is a multi-center, observational study.
The CLEK Study's purpose is to prospectively characterize vision, corneal changes, and patient quality of life findings in keratoconus and to determine the progression of changes occurring with keratoconus over time. The CLEK Study is an eight-year study. Over 1,200 keratoconus patients are enrolled at 15 participating clinics across the United States. These patients were examined at the beginning of the Study and will be examined annually thereafter. The CLEK Study evaluates keratoconus patients' quality of life, case history findings, contact lens wearing time, visual acuity, corneal findings, corneal scarring, corneal topography, mode of treatment, contact lens fit, rigid contact lens base curve radius just clearing the corneal apex, corneal photography, and fluorescein pattern photography.