Really is no harm in applying. You can either apply, and POTENTIALLY be turned away because of the eyesight at medical, or you can go on wondering and not knowing.
That, in my opinion, would eat away at your. Also, as you get along the application process, you'll become more aware of other roles should you not be successful.
My opinion would be just give it a go. Give it your best, and what will be will be. Also, I unfortunately have had to lose the beard! Devastating but thems the rules! Turn up to any AFCO meeting smart, but don't worry about the beard if it's maintained.