Standardizing the measurement and classification of quality of life using the Keratoconus End-Points Assessment Questionnaire (KEPAQ): the ABCDEF keratoconus classification.

"the database used for the analysis of this paper is freely and permanently available from harvard dataverse at https://doi org/10 7910/dvn/apbox9 ."

"Declarations Ethics approval and consent to participateAll procedures performed in studies involving human participants were in accordance with the ethical standards of Research Ethical Committee at the Clínica de Oftalmología Sandiego (Medellín, Colombia, reference number “Keratoconus-01”) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding No funding was received for this research."