Comparative STudy of the ARGos Biometer Compared to UltraSound Biometer in B-mode in Case of Measure Failure With a the Conventional Biometer

Our recent experience with Argos has shown that LA measurements were even possible with our without ERV mode in case of very dense (ie: cataracts in diabetic patients) or posterior subcapsular cataracts. These observations lead us to propose a retrospective study to compare Argos to our gold standard "ultrasound biometer in mode B" for LA measurements in case of failure with the conventional optical biometer used in our current practice (Lenstar LS900, IOLMaster 500, 700) In current practice, the biometry measurements are conducted with our conventional optical biometer during the visit prior to cataract surgery. At the same time, measures will be conducted on Argos with or without the ERV mode If axial length measurements are impossible with our conventional optical biometer due to the level of cataract density, axial length measurements will be conducted with our ultrasound biometer in mode-B (Quantel Medical, Aviso S with the 10MHz probe) according to our current practice. We will retrospectively collect the consecutive data from eyes for which axial length measurements with our conventional biometer were not possible