There are two very important models in ophthalmology when it comes to lenses, and it is very important that you know the difference between one and the other, as they are designed for different cases, and you should choose yours according to your personal needs.
Lenses have been evolving, seeking to improve comfort for wearers, and currently there are two very popular types of lenses, which differ in certain aspects. We are talking about corrective lenses and progressive lenses.
Corrective lenses: These are the ones commonly offered in opticians' shops, as the lens is designed for the personalised correction of your visual impairment. According to the result of your exam, corrective lenses are created. Whether it is for astigmatism, myopia or hyperopia, the lens is made especially for the case.
These types of lenses are the ones that are normally used, and are very functional for each person, as they are custom-made, but over time, if you have different vision problems, you will have to use several lenses for each of the problems. The formula condenses your main difficulties to avoid this, but it can happen.
Progressive lenses: If your problem is that you can't see far or near, for example, you can learn to use these lenses and have them for both uses, without the need to change, plus you can cure presbyopia, which is the tired vision that usually occurs after the age of 40 in both sexes.
One thing that can be tricky about these lenses is that you have to learn how to "handle" them, because their transition works through movement. If you look up, for example, you will see far away; objects that are in the middle distance, you will see them looking straight ahead; if you look down, you will be able to see up close.