Bicylindrical Spectacle Lens

L. o. for vision correction with astigmatism, both surfaces of which are toric.

Bicylindrical lenses are used to correct astigmatism, an optical defect of the eye in which light rays passing through the cornea or lens are focused not at one point, but at two or more points located at different distances. This leads to distortion of the image on the retina.

Bicylindrical lenses have two different powers in two perpendicular planes, allowing them to simultaneously correct astigmatism in both meridians. Both surfaces of such a lens are toric (have the shape of part of a cylinder).

Compared to single-cylinder lenses, which correct astigmatism in only one plane, bi-cylinder lenses provide more precise and complete astigmatism correction, giving clear vision at all distances. They are widely used in glasses, contact lenses and intraocular lenses.

Eyeglass lenses are an important component that helps improve the quality of vision and correct astigmatism. One of these lenses is a bicylindrical spectacle lens or simply a lens designed to correct astigmatic vision. Her device was developed in the 1950s and is still widely used for various types of astigmatism.

First of all, **bicylindrical spectacle lenses** provide improved vision by changing the focus of the eye in different areas. They have a special shape and form that must be taken into account when making a spectacle lens. Compared to a conventional spherical lens, which focuses light on only one plane, the lens has a bidirectional effect on the patient's vision.

One of the reasons for such high quality vision is that both lens surfaces are **toric**. The toric surface creates a high degree of flat surface where the "ray" of light enters the eye passes. This beam optimizes focus on the lens plane and compensates for the astigmatic component of your refraction. This in turn is a very important process.

Another important property of the lens is its **individualization**, created for each person. The lens design is designed to create an optimal visual field and improve vision for everyone. This allows you to create exactly the correction function that is located in a specific location on the lens. There is a wide range of convexities, curvatures and therefore degrees of astigmatizing lenses for different types of pain.