Which lens type is primarily used for presbyopia?

The progressive lens is primarily used for presbyopia because it offers a seamless transition between multiple viewing distances. Presbyopia is a condition that usually occurs with age, where the eye's lens becomes less flexible, making it difficult to focus on close objects. Progressive lenses are designed with no visible lines and contain multiple lens powers, allowing the wearer to see clearly at various distances—near, intermediate, and far. This multifocality helps in accommodating the natural vision changes associated with presbyopia without the cosmetic issue of lines seen in bifocal lenses.

In comparison, while bifocal lenses also help with presbyopia by providing two distinct optical zones for near and distance vision, they do so with a visible line separating the two. Monovision lenses can be used where one eye is corrected for distance and the other for near vision, but this may not be comfortable for all patients and can lead to depth perception issues. Concave lenses are primarily used for correcting myopia (nearsightedness) and are not suitable for presbyopia, as they do not address the multifocal vision needs of individuals with this condition.