Eyeglasses are the most common form of eyewear used to correct or improve many types of vision problems. They consist of a frame that holds 2 pieces of glass or plastic, which have been ground into lenses to correct refractive errors.
What is glass homogeneity?
Inhomogeneity takes the form of either global inhomogeneity, which is a refractive index variation across the entire piece of glass, or striae, which are spatially short range variations of the homogeneity in a glass covering a distance of about 0.1mm up to 2mm. ...