What does bvd mean on your glasses prescription?

An eyeglass prescription can sometimes seem very opaque to the layperson.
In fact, it contains so many figures and technical terms that it can seem inaccessible to decipher.
But it's important to understand what the prescription says, and in particular what the acronym BVD stands for.

The meaning of BVD on an eyeglass prescription

On a prescription for eyeglasses, the ophtalmologist provides various data for both eyes.
These precise figures then enable the optician to fit the lenses with the visual correction required by the individual.
However, what these numbers refer to is often given in acronyms or abbreviations that can be difficult to understand.
For example, the notation BVD may appear on a spectacle prescription.
The letters BVD stand for Back Vertex Distance, which is the distance between the back of the lens and the front of the eye.
This distance, measured in millimetres, can vary depending on a number of factors.
In fact, the back vertex distance can vary depending on the shape of the frame or the facial morphology of the person wearing the glasses.
A standard back vertex distance is 12mm, but this needs to be adjusted more precisely for each individual.
A pair of prescription glasses made to the wrong 12mm standard can cause visual distortion and reduce the effectiveness of the lens correction.
Therefore, the optician needs to adjust the distance according to the power given to the lenses in order to provide a perfectly fitting pair of eyeglasses.

The other meaning of BVD in optics

In optics, the letters BVD can stand for something other than back vertex distance.
In fact, it can stand for Binocular Vision Dysfunction, a disorder that corresponds to a misalignment of the two eyes.
This misalignment, however slight, means that the eyes have difficulty sending a clear image to the brain.
As a result, the person's vision may be blurred, doubled or even squinted.
For both adults and children, BVD is sometimes misdiagnosed as dyslexia or ADHD.
This vision disorder leads to difficulties in everyday life, such as reading or driving.
It can also be accompanied by symptoms such as dizziness, headaches or hypersensitivity to light.
Binocular vision dysfunction can be treated with vision therapy and prismatic lenses.

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