"All lenses are not created equal" Yes, there are real differences in lenses. Just because the prescription is "right" doesn't mean their performance is as good as it should be. There are many other factors besides the prescription such as lens material, coatings. lens warpage and optical placement. A correct prescription poorly placed within the frame compromises performance. I am happy to diagnosis problems associated with your glasses. Sometimes it is merely using glasses where they can't perform. Progressive lenses used on a computer is a good example. Usually that means you must hold your chin unusually high to see the screen. There are good remedies for this and other "problems" associated with eyeglasses. Please just ask! ! !