The best makeup mirror magnification depends on the user's preference and eyesight. For most users with normal vision, 3x to 5x magnification works well. Higher magnification levels are recommended for those who are visually impaired so they can see even without wearing their glasses.
The higher the magnification, the closer you will have to be to the mirror for a more detailed and less distorted image. Mirrorvana's makeup mirrors have different magnifications ranging from 1x to 20x.