Speak to the CAA Medical folk, they are extremely helpful but I think they'll inform you that unless you are intending to wear a pirates eye patch whilst controlling, its what the two eyes do together which really matters.
Clearly there are limits but in the interim go back to your optician and explain the situation, any decent optomotrist will appreciate your potential problem and decide what is best for you.
When you go for your medical, take the new prescription with you.
All the best.