64As far as concerns the determination of that minimum value relating to visual acuity required by Directive 2006/126, it must be recalled that the EU legislature has a broad discretion as to complex medical questions, such as those relating to the visual acuity necessary to drive power-driven vehicles. In such a context, the European Union judicature cannot substitute its assessment of scientific and technical facts for that of the legislature on which the founding treaties have conferred that task (with regard to the latter, see, inter alia, Afton Chemical EU:C:2010:419, paragraph 28).
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