1.56 Bifocal Flat Top Photochromic Gray HMC Optical lenses
|Place of Origin:||Jiangsu||Brand Name:||BORIS|
|Model Number:||Photochromic Lens||Lenses Material:||SR-55|
|Vision Effect:||Bifocal||Coating Film:||HC/HMC/SHMC|
|Lenses Color:||White(indoor)||Coating Color:||Green/Blue|
A bifocal lens
Features: Two focal points in a pair of lenses, and a small lens superimposed on a normal lens; For presbyopia patients to see far and near the use of alternating; The upper is the distance luminosity (sometimes flat), the lower is the reading luminosity; The distance degree is called the upper light, the near degree is called the lower light, the difference between the upper and lower luminosity is add (external luminosity);
Advantages: The presbyopia patients do not have to change glasses when looking near and far.
As the name suggests, a bifocal lens has two photometric lenses, the far primary lens and the near secondary lens. According to the distribution and shape of the sub-lens, it is divided into one-line double light, flat top double light and dome double light. Bifocal lens can take into account both distant and near vision, but there is a clear separation line, will let the wearer feel like the existence of jump, so after the emergence of progressive multifocal lens, has been gradually replaced. Here we focus on progressive multifocal lenses.