Old thread but possibly still relevant A few years ago i developed unexplained double vision , which resulted in the opthmologist giving me an exclusive contact lens to effectively blind me in one eye at the request of my then employer I contacted DVLA, and all they were interested in is whether i could still read a number plate at the required distance, when i said that i could, they closed the case with no further investigation required. I have recently started riding a bike, although luckily, I had some further treatment last year and the double vision has gone ( except when i am very very tired)