52As far as concerns judicial review of the requirements of the principle of proportionality relating to the minimum standards for the visual acuity necessary to drive power-driven vehicles, it must be observed that, as regards complex medical assessments such as those at issue in the main proceedings, the EU legislature has a broad discretion and review by the Court is limited to verifying whether there has been a manifest error of assessment or a misuse of powers, or whether the legislature has manifestly exceeded the limits of its discretion (see, to that effect Case C‑425/08 Enviro Tech (Europe) EU:C:2009:635, paragraph 47; Case C‑343/09 Afton Chemical EU:C:2010:419, paragraph 28; and Case C‑15/10 Etimine EU:C:2011:504, paragraph 60).
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