Don't forget that if you've previously held any CAA medical certificate and you were required to wear corrective lenses/spectacles, the AME may ask a few searching questions if you turn up for a renewal/reissue and are able to see unaided.
Until recently, it used to be the case that the CAA required you to undertake a period of time away from flying/controlling to ensure that satisfactory stability of the eyes.
Best to come clean and admit it.