What Is The Difference Between Reading Glasses and Bifocal Glasses?

When a person reaches about 40 years old, he notices that it is becoming more and more difficult to read fine print. This may be a common vision problem of presbyopia. Presbyopia will increase with age, especially near-sighted objects. This is a natural phenomenon of human aging. With age, the lens of the eye gradually thickens and loses its previous elasticity, and the ciliary muscle also shrinks. The refractive power of both eyes becomes weak, especially when seeing things up close. If you increase the visual distance between your eyes and the object, you can often see more clearly. For example, if you hold a book or magazine farther, you will see it more clearly. Therefore, presbyopia is sometimes called a long-hand symptom.

Even if you pay attention to protecting your eyes, the degree of presbyopia in your eyes will increase with age, generally at a rate of 50 degrees every 5 years. Generally, when this happens, it is recommended to wear a pair of oversized reading glasses or full lens reading sunglasses.

Reading Glasses

Before wearing portable reading glasses, you have to go to the hospital for a comprehensive examination of your eyes, including refractive status, eye position, accommodation, intraocular pressure and fundus. After excluding cataracts, glaucoma and some fundus diseases, the prescription reading glasses can be accurately determined. After the symptoms of presbyopia appear, a professional optometry examination should be carried out, and presbyopia suitable for you should be fitted. You can choose ordinary reading glasses or progressive multifocal lenses with a gradual diopter degree from top to bottom. The upper part is suitable for looking at the distance, and the lower part is suitable for looking near, making it more convenient to use.

Reading glasses made of inferior lens materials cost less, but the vision will be distorted for a long time, color blindness or glare. So it is recommended to buy a pair of good quality reading glasses.

Bi-focal Glasses

Bifocal spectacle lenses, commonly known as bifocal glasses, are made by bonding or fusing two refractive index glasses. This is divided into tangible bifocal and invisible bifocal glasses.

A lens with two diopters on a lens is called a bifocal lens. People with myopia often need to wear bifocal glasses after presbyopia. The upper and lower parts of the lens have different refractive powers. You can see distant objects through the upper part and read and do near work through the lower part. In addition to presbyopia, some people do close work for a long time. In order to reduce eye fatigue, bifocal glasses are also needed. There are also bifocal glasses for children to prevent the development of myopia.

The working principle of various bifocal glasses is the same. A small part of the lens is used to correct near vision, and the other part of the lens corrects far vision. For patients with presbyopia without refractive error, this part can be made flat (no refractive power).

Presbyopia needs to wear presbyopia glasses, due to work needs or better conditions, you can wear progressive multifocal glasses or contact lenses for correction. Progressive multifocal glasses can focus near, middle and far light on the back of the eyeball to present the clearest image. Two completely different but complementary contact lenses form this special system to achieve clear vision from near to far, so as to achieve the treatment and correction of presbyopia.

In addition to the above two glasses, sightline multifocal computer reading glasses, no line bifocal reading glasses and anti blue light reading glasses are also available.