Defining Your Vision Needs Choosing top rated online eyeglasses starts with understanding what your eyes actually need. This isn't just about correcting blurry vision; it's about getting the right type of lens for your specific activities and age. Let's break down the vision needs you should identify before you even look at frames. Single Vision vs. Multifocal/Progressive Most people need single vision eyeglasses . These lenses have one power throughout the entire lens, used for correcting distance vision (like driving) or near vision (like reading), but usually not both with the same pair. This is the most common type of prescription lens you'll find when shopping for online eyeglasses . However, if you're over 40 or have presbyopia, you might need different powers for different distances. This is where multifocal lenses come in. Bifocals have two distinct powers, usually for distance and near vision. Trifocals add a third power for intermediate distance. Pr...