dualfocus

Dualfocus refers to a type of eyeglass lens designed to correct vision at two distinct distances, typically for presbyopia. Presbyopia is an age-related condition where the eye's natural lens loses flexibility, making it difficult to focus on near objects. Dualfocus lenses achieve this by having two separate optical powers within a single lens. This is commonly accomplished through a gradual change in prescription across the lens surface.

The upper portion of a dualfocus lens is usually designed for clear distance vision, while the lower portion is optimized for reading and other close-up tasks. A transitional zone exists between these two powers, allowing for a smoother shift in focus as the wearer moves their gaze. This design aims to eliminate the need for separate reading glasses or bifocals, offering a more seamless visual experience.

The implementation of dualfocus technology can vary. Some lenses employ a progressive design, where the power changes continuously from distance to near. Others might have a more distinct line or area separating the two focal points, though this is less common in modern dualfocus designs. Patients using dualfocus lenses often require a brief adaptation period to become accustomed to the different visual zones and how to best utilize them for optimal clarity at various distances.