Which type of lens is designed to correct presbyopia?

Bifocal lenses are specifically designed to correct presbyopia, which is a condition that typically occurs as people age, making it difficult to focus on close objects. Bifocal lenses contain two distinct optical powers: one for distance vision and one for near vision, typically separated by a visible line on the lens. This allows individuals with presbyopia to seamlessly transition between viewing objects at different distances without needing to switch between different pairs of glasses.

Monofocal lenses, on the other hand, are designed to have a single prescription throughout the entire lens. They can correct either distance vision or near vision but are not suitable for individuals with presbyopia who need assistance with both.

Concave lenses are primarily used to correct myopia (nearsightedness) rather than presbyopia, as they help diverge light rays to allow clearer vision for distant objects.

Polarized lenses are designed to reduce glare from surfaces such as water or roads and enhance visual comfort but do not specifically address the vision correction needed for presbyopia.

Thus, bifocal lenses are the optimal choice for accommodating the vision changes associated with presbyopia, catering to both distance and near sight with their dual prescription design.