Optical lens manufacturer - So many kinds of lenses? How to choose?
There are six kinds of lenses.
Generally, lenses can be divided into two categories: convex lens and concave lens. The central part thicker than the edge part is called convex lens, which has three kinds of biconvex, flat convex and concave convex; the central part thinner than the edge part is called concave lens, which has three kinds of biconvex, flat concave and convex concave.
Convex lens has the function of converging line, so it is also called "converging lens" and "positive lens" (it can be used for hyperopia and presbyopia). This kind of lens can be divided into:
Optical lens manufacturer - a. Biconvex lens is a lens whose two sides are ground into convex spheres; B. planoconvex lens is a lens whose one side is convex and the other side is flat; C. concave convex lens is a lens whose one side is convex and the other side is concave.
Concave lens has the function of divergent light, so it is also called "divergent lens" and "negative lens" (can be used for myopia glasses). This kind of lens can also be divided into two types
Optical lens manufacturer - a. Biconcave lens is a lens with two sides; B. plane concave lens is a lens with one side concave and one side flat; C. convex concave lens is a lens with one side convex and one side concave.
