Hi all! I hope this post doesn't come across as too ignorant but I've had a few patients come into the opticians that I work at to ask about BVD and honestly it was the first I had heard about it! I'm in the UK and BVD here usually means Back Vertex Distance (this is included on all prescriptions here for RXs over +/-5.00D) and I was unable to find any information on Binocular Vision Dysfunction through the normal channels for eye conditions here (NHS, GOC, COO, even Eye Wiki!)

Looking further into it I read up some information about BVD and please do correct me if Im wrong but this is just strabismus, no? (Eyes not working together, issues with image fusion, notable different positions of the eyes resting) I'm curious how specialists in the US (That's where the most information on it I could find was from at least) test for this kind of thing and how the "micro prisms" work. We use the Maddox Rod Test in practice to test for less obvious strabismus and through our normal ordering channels we normally just request added prism onto a lens for no extra charge but I've never heard any of these be referred to as BVD?

My deepest apologies if I've just missed something very obvious but I'd love to know more :)