Cylinder lens(Cylindrical Lenses) is a special kind of lens, which only focuses or disperses light in one direction. Cylindrical Lenses are a special type of lens that focuses or scatters light in only one direction. The background of this kind of lens is mainly to meet the specific optical needs, for example, in some optical systems, it is necessary to change the direction of propagation of light in one direction, while keeping the direction of propagation of light unchanged in the other direction.

• positive cylindrical convex lens: the cylindrical side is convex and has the function of converging light rays.
• ortho-concave cylindrical lens: the side of the column is concave, with the characteristic of diverging light.

Both structures keep one plane side, forming asymmetric optical properties.

• Vision correction field

– For patients with corneal astigmatism, compensating the irregular curvature of the cornea through the curvature of the column surface.

– In compound refractive error correction, it is used in combination with spherical lenses.

•  Laser processing systems

– Shaping of circular laser beams into linear spots for metal cutting processes

– Controlling the beam divergence angle in laser marking systems to improve marking accuracy.

•  Optical configurations

– For spectrometer optical path systems to achieve linear focusing of slit images.

– In the projection display equipment to correct image distortion

light through the cylindrical lens, the cylindrical axial refraction effect, the plane axial to maintain the original direction of propagation. This anisotropic refraction property enables:

• single-dimensional beam shaping
• asymmetric optical path design
• specific direction aberration correction

As the demand for precision optics improves, high-precision cylindrical lenses show greater potential for application in emerging fields such as micromachining, biomedical imaging, etc., and the precision requirements for their surface shape have entered the submicron scale.

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