Spectacle lenses: how they work and how they differ

A spectacle lens is a precisely designed optical element. Its task is to change the direction of light rays so the eye can form the image in the right place. A well-fitted lens lets you see more sharply and with less effort.

Lenses differ in power, curvature, design, material, thinning and coatings. What matters for the client is how these parameters affect everyday life: sharpness, field of view, weight, appearance and ease of cleaning.

Single-vision lenses have one power and are used for distance, near or a specific working distance. Relaxation lenses may relieve eyes during long near work. Office lenses are comfortable for screens and documents, while progressive lenses combine distance, intermediate and near vision in one pair.

There are also photochromic lenses that darken outdoors, prescription sunglasses, driving lenses that reduce glare and children's lenses where impact resistance and UV protection matter.