LAUSR

used. In that context, our results indicate that half of t-IOL implantations may be under-optimized due to the variability in anterior astigmatism measurements as a function of the ocular surface conditions. One limitation of the present study, due to medical records reviewed retrospectively, is the absence of analysis of intra-individual variability in the axis of astigmatism (without saline drop). However, previous studies already suggested that modern optical biometer devices such as the AL-Scan provide precise and highly reproducible biometry measurements (Kola et al. 2014). This study strongly suggests that any diagnostic eye drop (mydriatic, fluorescein, saline. . .) used in every day clinical practice at the time of cataract surgery planning may influence the choice of t-IOL position, according to the delay since the last eye drop instillation.