Similar situation; I was granted a flying scholarship, but was hopelessly short sighted - no flying for me in the regular RAF! Truth is, eyesight is a great natural filter. There are countless people out there capable of meeting and exceeding officer and FJ/ME/Rotary aircrew standards. Why would you take someone with less than ideal eyesight when you have multiple candidates, all equally able with perfect eyesight?
The RAF is in a situation where it does not have to take people with correted sight; simple supply and demand.