Purpose To determine whether the intraocular penetration of travoprost 0.004% is affected by central corneal thickness. Methods Sixty-four patients who were scheduled for cataract surgery without any other ophthalmologic pathology of significance were enroled in this study. At 120 min before surgery, one drop of travoprost 0.004% was instilled in the eye to be operated on. At the start of surgery, a sample of aqueous humour was extracted to subsequently determine its AL-5848 concentration. These concentrations were compared among three groups of patients established according to central corneal thickness measurements obtained by ultrasound pachymetry. Results Mean AL-5848 concentrations were 3.27 ± 2.03 ng/ml in Group I (CCTo511 microns), 3.27 ± 2.44 ng/ml in Group II (CCTZ511 and r574 microns), and 2.73±2.15 ng/ml in Group III (CCT4574 microns), indicating no significant differences among the groups. Conclusions We were unable to demonstrate the greater or lesser penetration of travoprost depending on corneal thickness, which could explain differences in patient responses to this drug.