Aspheric Lenses

Points have undergone many improvements and changes over the years, helping to solve vision problems. Today there are a lot of different variants of glasses, with a variety of lenses. The most popular are aspherical lenses.

Early attempts to create lenses of this type were made by Rene Descartes in the 1620s and by Constantine Huygens in the 1630s. The cross-section shape developed by Descartes for this purpose is known as the Cartesian section.

Francis Smethwick created the first high quality aspherical lenses and introduced them to the Royal Society on February 27, 1667. It was a telescope containing three aspherical elements.

The development of the first aspheric lenses for glasses is attributed to Moritz von Row. Mass production and use of such lenses began in the 50s of the last century thanks to the production of video cameras with aspherical lenses, which became very popular due to the excellent quality of shooting.

Traditional lenses have a curved glass surface. Aspherical lenses, in contrast, are made with the help of special cast glass, and although they still have a curved surface, it is not completely spherical.

This difference in shape makes them more accurate and with fewer visual aberrations than spherical lenses. Aspheric lenses are mainly used in glasses, but in the last 30 years they have been developed to produce high-quality photographs and as a standard for small photo and video cameras.

Due to the smaller size and thinner center, manufacturers are much easier to adjust the shape of the lens when creating, which makes it possible to adjust the optical power of each lens and its clarity.

Aspheric lenses are cheaper and smaller than conventional lenses, and the quality often exceeds those that are made in a spherical shape.

Among this type of lens, lenses with an aspheric anterior or posterior surface are distinguished (the second surface remains spherical), and also with double aspherics, when both the outer and inner surfaces are "flat".

Aspheric lenses for glasses in comparison with spherical have a number of advantages:

- a clearer and wider field of view thanks to the thin curve of the lens, allowing owners to see clearly and clearly, looking from any part of the lens.

- minimal distortion along the periphery (abberation);

- a more natural perception of the size of objects and space ("minus" lenses do not reduce, "plus" does not increase);

- Less weight due to a reduction in thickness, which provides correction of vision without the cumbersomeness of too thick spherical lenses;

- smaller thickness: positive lenses are thinner than the center, while in the minus ones the edge is thinner;

- No distortion of the size of the eyes (the effect is usually noticeable when looking at a person with glasses on the side).

With the rapid development of technology, aspheric contact lenses have become very common over the past few years. They can be made of a rigid or flexible material, can change the color and appearance of a person's eyes, correct various eye disorders. One such disorder is astigmatism, which is often corrected with aspheric contact lenses.

They are smaller and thinner than conventional lenses, and this partly explains why they are called "premium", and why they have a higher price.

Aspheric lenses are thinner, and this means that they are better adapted to the unique curve of the eyes of each owner and will interfere less when flashing.

The disadvantages of lenses of this type include their high cost associated with a more complex manufacturing process. In addition, the smaller thickness of the aspherical lens means that they are located closer to the face, which sometimes causes visible reflections on both sides, which can only be repaired by applying an anti-reflective coating.