Biconcave

Biconcave is an optical element that has two concave surfaces. This element is often used in lenses to correct vision for people suffering from myopia.

For a better understanding, you can compare the biconvex element with another type of lens - biconvex (Biconvex). A biconvex lens has two convex surfaces and is used to correct farsightedness.

Optical lenses are designed to change the path of light rays. Biconcave lenses can scatter light rays, which makes the image smaller and improves the visibility of objects close to the eye.

Typically, biconcave lenses are made of glass or plastic. They are disk-shaped with two concave surfaces. To achieve the desired optical power, lenses can have different thicknesses, radii of curvature and refractive indices.

In order to choose the right lenses for vision correction, you need to consult an ophthalmologist. He will perform a detailed eye examination and determine the best lens option.

In conclusion, biconcave lenses are an important element for vision correction for nearsighted people. They have a concave shape on both sides, which allows them to diffuse light and improve the visibility of nearby objects. Correct selection of lenses must be done under the supervision of a specialist in order to achieve the best result.

Biconvex (lens) - a lens, both surfaces of which are concave inward, so that the lens refracts rays running parallel to it in the forward direction. This leads to the fact that a person wearing such a lens better sees objects located on the other side of his eyes.

Lenticular convexities on the outer surface give the lens the necessary shape and serve to focus light. Refraction caused by the curvature of the sphere leads to a decrease in the refractive index for shorter wavelengths, but at large angles of incidence a conventional lens is still effectively focal (just like a plano-convex lens). Due to the uneven refractive properties of the crystal, which has a significant thickness and, as a result, the dependence of the refractive index on the thickness, uneven illumination during spectrum scattering

Currently, glasses are still relevant, despite the fact that their development and use have already passed their peak in the 60s. However, it is possible that after some time we will see them return in a different form. In addition, progress does not stand still and 3D technologies are now actively developing.