The visual requirements for the medicals can be copied of the websites of the regulatory bodies (FAA/CAA/SA CAA) and you can take that to any optician who will be able to tell you (probably for a fee) whether you meet the requirements.
Indeed people who are monocular can be certified by the FAA.
The long and short of it is that you will need to go and see someone who can do the eyetests for you and compare them against the regulations.
That I think is the best this BB will be able to come up with.
And yup there are some machines with which you can do all the eyetests.
FD