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The single-lens, or single-lens, has the same correction power over its entire surface. It can be used for a simple vision correction, such as myopia, hyperopia, astigmatism and presbyopia.
There are two types of single focus lenses:
Multifocal lenses do not have the same surface correction power. The correction force changes progressively from the top of the lens to the bottom of the lens. The result is to have a lens with different correction forces, so that we can see at all distances (Far – Medium – Near).
We can also have a corresponding lens with the multifocal one, but without the corrective power for long distances. So we will have a lens for Medium – Close work. They are usually used by people who do office work
It is a treatment that is done on the ocular lenses to make them clearer and clearer. Each coating that enters the ophthalmic lens, gives it an extra property. The coatings are as follows:
The more coatings an ophthalmic lens has, the better for our eyes and for an aesthetic result.