The document in question (CAM/LR/AEIG/02/13) is indeed unclas. It states that you will be entitled to MOD-funded soft contact lenses if you fall into one of these categories:
1. FJ, RW or ME pilot.
2. WSO.
3. ALM.
4. Army aviation rearcrew.
5. Air engineers.
6. All RW rearcrew of operational platforms in a primary flying role.
7. Ground engineers in a flying role.
That said it does stress that you have to be on an active flying tour. Also, there is no blanket roll-out so you only become entitled at the time of your next eye test.
Ask at your Med Centre; they should have a copy of the full document.