Know your prescription type
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.
A progressive lens combines distance vision correction, middle vision correction and near vision correction. Due to the individualized nature of these lenses, they are able to correct even the most unique eyes, providing all the benefits of bifocals without the obvious horizontal line.
Consider progressive lenses if you require bifocals but would like your lenses to be free from lines.