Positive lenses, constructed based on the principle of refractive light. Positive lens is at the center of the thinner, thicker part of the. It is convex. Positive lens is split into plano-convex, biconvex and positive curving moon as well as different forms. Positive lens is responsible for convergence of light. Therefore, it is also referred to as a convergence lens. Farsightedness glasses are a positive lens.

Negative lenses are designed based on the principle of refractive light. Negative lenses are are smaller in the middle and are thicker around the edges to form the concave shape. Negative lenses can be split into two concave flat concave, negative curved moon, as well as different forms. Negative lenses work by of dispersing light. Myopic glasses are concave lenses.

Cylindrical lenses are usually designed to direct the light onto a line, or to alter an aspect ratio in the picture. They are typically formed as a line, that can alter how the beam is directed.

Cylindrical lenses are cylindrical in surface that permits the light to be centered within a specific dimension, and expands the image. Cylindrical lenses have either positive or negative focal lengths, and are perfect in laser line generation and beam shaping deformation. Examples include turning the point spot to a line spot or altering the size of an image without altering the width of the image. Examples of applications include linear detector illumination and bar code scanning optical processing of information, computers or laser emission.