A University of Utah team have a working prototype of a new twist on fluid-filled lenses for correction of vision problems: automatic adjustment and refocus depending on what you’re looking at ...

Far-reaching vision can't claim telescope's invention. The philosopher and mathematician, ... Ibn Alhazen, wrote about concave lenses in his groundbreaking mathematical book on vision.

Whereas regular or standard lenses have a circular shape, aspheric lenses have a varying curve across the lens. They’re a thinner, flatter, upgraded lens. Understanding Light and Vision ...

A plano-concave lens is a lens with one side being flat and the other side being concave. It is characterized by being thin in the center and thick at the edges, and can make parallel light rays ...

The fifteenth century saw the convex lens' opposite appear: the concave lens for myopia, a vision impairment of the young. We have documentation of these being available as early as 1450.

Ortho-k (orthokeratology) contact lens are specially designed GP contact lenses that are worn during nighttime and removed during the daytime, for better vision in patients with short-sightedness.