multifocal lenses

Progressive, varifocal or multifocal lenses can correct near-sightedness, farsightedness, astigmatism and presbyopia at the same time.
Les verres progressifs, varifocales ou multifocales peuvent corriger la myopie, hypermétropie, astigmatisme et presbytie en même temps.
The multifocal lenses had drawbacks: people with these lenses were more likely to see halos around lights and had reduced contrast sensitivity (the ability to distinguish an object against a background which is similar to the object itself).
Les lentilles multifocales présentaient des inconvénients : les personnes ayant ces lentilles avaient davantage tendance à voir des halos autour des lumières et avaient une sensibilité réduite aux contrastes (la capacité à distinguer un objet sur un fond semblable à l'objet lui-même).
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