Intersting and just published yesterday. you are on the ball OYPJN!
I dont want to get over excited here but it seems there are NO limits for the refractive error (lens strength) for glasses or contacts. A bit like in the USA where if you can wear corrective lenses in oder to comply with the rules then its OK. At present its +/-5 dioptres for long sight for example.
it would be great if this opinion was adopted.
PS if you click that link then choose the second PDF entitled draft regulation on part MED page 24