As above, don't ever try to write a dual-subject Personal Statement - it will be totally obvious to all 5 choices that you are not committed to 'their' subject.
Some Unis will allow you to submit a 2nd PS directly to them. If you are applying to 4 Optometry choices and 1 Pharmacy, then write an Optometry UCAS PS and find a Uni that will accept a 2nd PS for Pharmacy (like Bath).