[Subjects and Methods] Subjects were 10 visually normal participants (average age, 22.7±1.2 years) with corrected decimal visual acuity of ≥ 1.0. The subjects wore five absorptive lenses (OR, OBL, DG, OG, and PU) of the RETINEX series (HOYA Company, Japan) to be tested and no absorptive lens as controls. A Landolt ring target (target size 0.3) was displayed 5 times (3 seconds/time) on an LCD monitor at a distance of 60 cm. The subjects wore the absorptive lenses and any changes in the fixation and pupil size were recorded by an eye tracker. To assess intra-individual variation, the actual measurements were converted to the corrected measurements based on the measurements obtained from the controls and the corrected measurements were analyzed by the Friedman's repeated measure test. Using Spearman's rank correlation coefficient, we also evaluated how pupil size correlated with fixation movement and short wavelength light transmittance at 470 nm.