This cross-sectional observational study followed the guidelines of the Declaration of Helsinki, and all patients signed an informed consent form approved by the Ethics and Research Committee of the Pontifical Catholic University of Goiás (Pontifícia Universidade Católica de Goiás - PUC-GO). The inclusion criteria were chronic renal patients, who were older than 18 years of age, were part of the hemodialysis program of the Santa Casa de Misericordia de Goiânia (SCMG) hospital, signed the informed consent form and were able to undergo a physical examination. Exclusion criteria were patients on hemodialysis who were not chronic renal patients; patients who refused to participate in the study or could not undergo a physical examination; patients who did not undergo hemodialysis in the week of the study; prior ophthalmic eye disease or surgery; and patients allergic to anesthetic drops or dyes.