ALB and Schnyder corneal dystrophy: We chose to consider that a measured GFR higher than 110 mL/min/1.73 m2 defines hyperfiltration for two reasons: first, this definition is the one given by Haymann et al. in their recent work about GFR in SCD patients [5] and we wished to compare our results to theirs; secondly, although this arbitrary level may be considered as too low, we observed that in our population, urinary albumin excretion was the lowest when mGFR was between 96 and 112 mL/min/1.73 m2, whereas urinary albumin excretion significantly increased when mGFR was higher than112 mL/min/1.73 m2.