The RAF are aware that wholey suitable pilot candidates have in the past been lost due to eyesight standards of expectation. They are also aware that most aircrew beyond age 40 wear spectacles without any deteriation of operational capability.
I am not an OASC Staff Officer and therefore do not have a finger on this particular pulse, but I was in a meeting in which the Chief of the Air Staff stated that aircrew eyesight issues were under review and that it was hoped that the outcome would be that the 'best man for the job' would get the job even if that meant entering into flying training wearing spectacles.
Therefore one can reasonably deduce that entry standards are fluid; can and do change. The bottom line is for all potential recruits to go to OASC and give 100% in all aspects of the selection process. It is impossible for you to self criticise, and you may well have done well in an interview that you perceive as the nightmare from hell. The medical aspects are objective and you will either pass or fail: simples.