Bifokala

Bifokala is a term derived from the Latin words "bi" meaning two and "focus" meaning a point of convergence. In the context of vision, bifokala refers to a type of eyeglass lens that contains two distinct optical powers. These lenses are primarily used to correct presbyopia, a common age-related condition where the eye's natural lens loses its flexibility, making it difficult to focus on near objects.

The bifokala lens is characterized by a visible line that separates the two prescription areas. The upper portion of the lens typically corrects distance vision, while the lower portion, a distinct segment, corrects near vision. This design allows the wearer to see clearly at both far and intermediate distances by simply tilting their head or adjusting the position of their eyes. The transition between the two prescriptions can be noticeable, and some individuals may experience a slight visual distortion or "jump" when moving their gaze between the distance and near zones. Bifokala lenses are a practical and effective solution for many people experiencing presbyopia, offering a straightforward way to address multiple vision needs with a single pair of glasses. They are a more traditional design compared to progressive lenses, which offer a seamless transition between different focal lengths without a visible line.