tcw3: WRT Singapore, the answer is "yes", even for military pilot selection. Yes, that's right: current standard for selection by the Republic of Singapore Air Force is a refraction within +/-5.00 spherical dioptres and correctable to 6/6 or better in each eye separately, distant and near, no more than 2.00 cylinder dioptres of astigmatism. You must be a citizen or permanent resident of Singapore.
From their own official website:
Republic of Singapore Air Force - Careers - Vocations