A refraction test is usually given as part of a routine eye examination. It may also be called a vision test. This test tells your eye doctor exactly what prescription you need in your glasses or contact lenses. ... A refractive error means that the light is not bending properly when it passes through the lens of your eye.

What does VDT stand for glasses?

VDT (Video Display Terminal)

What is refraction charge at eye doctor?

[1] Refraction — the part of the exam when patients are asked to look through different lenses while reading a series of small letters and then asked which lens is better — is the test used to determine what prescription is needed for glasses or contact lenses.