Back in the 70s, my first medical showed defective binocular vision. The doctor said that my landings would be low and it took a long time to sort out my landings. Interestingly I did better landing at night.
Then the new optometrist prescribed prisms. I nearly fell down the stairs leaving his office with my new glasses. My next flight I did a perfect landing three feet above the runway, got the message and adjusted my landings accordingly.
In my 60s, I was diagnosed with glaucoma and began regular visits to ophthalmologists who have kept it well controlled. One of them sent me to an orthoptist who diagnosed a fourth ocular nerve palsy, likely congenital since I was prescribed prisms in my teens. Unfortunately Transport Canada got its knickers in a knot over this long-standing condition and wants annual reports from the ophthalmologist.
I would have done better to decline the orthoptist as it only gave something else for Transport Canada to worry about, even though prisms have the problem completely controlled.