When selecting lenses, you should consider the vision-correcting properties you are looking for. According to your visual requirements, you may need either single vision or multi-vision lenses.
A single-vision lens can correct vision sufficiently for many people, whether they are reading or looking at distances.
You may be looking for single-vision distance lenses to correct your vision if you suffer from nearsightedness. Single-vision distance lenses are the most commonly used type of correction worldwide. You will receive a prescription beginning with a (-) that will have a concave lens, or one that curves inward, in order to provide proper vision correction.
The purpose of reading glasses is to allow you to see things up close - typically within 30 to 40 cm. You will receive a prescription beginning with a (+) that will have a convex lens, or one that curves outward, in order to provide proper vision correction.
The majority of eyeglass wearers can benefit from single-vision lenses, but your eyes may differ from those of others. You might need bifocals or multifocals if you're having trouble seeing both near and far. As a result, you'll be able to see clearly from a distance, as well as up close.