Glasses Lenses - Eyeglasses Lenses

With the development of the hi-tech progressive lens glasses, this type lens is becoming very popular. When people are aged over 40, lots of them can’t see words nearby clearly, and they need to wear presbyopic eyeglasses. This background is that presbyopia makes it necessary to wear multifocal glasses. The presbyopic patients are quite bothered, because the switches between two pairs of prescription glasses are so troublesome. They need to wear two pairs of prescription glasses for nearsightedness and presbyopia respectively. Majority of these people would like to use reading glasses only in office or at home during the long terms of reading.

However, When they are forced to change focusing ranges, from the near to the distant or vice versa, two different pairs of prescription glasses will lead to solely inconvenience. Luckily, the great US founder Benjamin Franklin invented bifocal eyeglasses first. By using these glasses, the inconvenience is eliminated. The bifocal glasses can offer both near and distance corrected vision. It is no longer needed to change different pairs anymore.

Recent years, the majority of the people use computer to work and play, sometimes people spend so much time on playing or using computer. They watch the screen for a long time with less rest. Finally their vision become even worse and they suffer from Computer Vision Syndrome. Different from either near vision zone or distance vision zone, this vision problem because of the computer screen usually sits within the intermediate vision range. The modern hi-tech have made trifocal eyeglasses a reality. This kind of prescription eyeglasses can offer corrected eyesight at three distances: the near, the distance as well the intermediate. This functionality can be obviously reflected by its name. Trifocal glasses make a further step by offering special computer vision.

Although bifocal and trifocal eyeglasses can “kill two or three birds with a single stone”, they seem like advanced enough in providing clear vision at multiple ranges. They are not advanced enough among the family of multifocal eyeglasses. Luckily there are still progressive lens glasses. Comparable to the bifocal and trifocal eyeglasses, the progressive glasses have no visible line exists. Using bifocal or trifocal eyeglasses, there will be noticeably a visible line or two lines on the lens. These lines are functionally used to set apart different visual zones. Progressive lens never cause these problems. There is no visible line exists. More critically, the vision line of the bifocal or trifocal glasses usually cause images to “jump”. Progressive lens glasses can offer smooth and seamless lowers transition. These advanced lenses have solved the problem of the traditional glasses.