what is bvd on eye prescription

BVD stands for Back Vertex Distance and is a term used in eye prescriptions to indicate the distance in millimeters between the front of the eye and the lens of the glasses. It is not related to binocular vision dysfunction (BVD), which is a condition where the two eyes are misaligned and therefore don’t have the same line of sight. Symptoms of binocular vision dysfunction include eye strain, headaches, dizziness, double vision, and vertigo. A regular eye exam may not detect BVD, but a BVD evaluation can diagnose it. BVD is treated with binocular vision therapy using customized micro-prism lenses, which bend light in such a way that the images viewed by the brain can be fused into one single comfortable image. The eye muscles will no longer have to strain as a result, delivering relief from eye strain, headaches, dizziness, blurred vision, and other symptoms.