Nowadays, progressive lenses are winning tremendous popularity among those suffering vision problems. What are progressive lenses, you may wonder. What is the big deal which makes progressive lenses so much-sought-after? Many hold that it is worth the whole while to get informed with their merits. You will find out all the answers regarding them in the following passages.
What are progressive lenses
Progressive lenses, also referred to as progressive addition lenses (PAL), progressive power lenses or graduated prescription lenses, are such kind of lenses with corrective powers, characterized by a gradient of increasing lens power used in prescription eyeglasses. Usually, the gradient starts at the wearer’s distance prescription, at the top of the lens and reaches a maximum magnification power, or the full reading addition, at the bottom of the lens.
The advantages and disadvantages of progressive lenses
Glasses with progressive lenses have graduated degrees of magnification power, enabling the wearer to see clearly and at the same time correct vision without substituting for bifocal and trifocal lenses. By only tilting their head to sight through the appropriate part of the vertical progression, wearer can easily adjust the additional lens power required for clear vision at different viewing distances. Unlike bifocal or trifocal lenses which are manifest with demarcated zone, progressive lenses are able to provide seamless progression of many lenses power for all viewing distances. With such a phenomenal quality, we can be spared the trouble of vision discontinuities. That is to say, the smooth and seamless transition of lenses power capacitate you to change focus from distance to near and back again more comfortably, with no image jump. With a pair of eyeglasses made of progressive lenses, you can see objects in the far, intermediate, and near distance equally clearly. But nothing is too perfect while progressive lenses also have their drawbacks. They are prone to suffer from the distortion of vision image, due to the fact that the power progression may create regions of aberration away from the optic axis, thus yielding poor visual resolution. This may cause some kind of uneasiness when you try on such a pair of glasses for the first time. Put it the other way, you may see quite clearly straight ahead and up and down, but you may not see as clearly to the left and right.
Several points that deserve attention
If you wear these progressive glasses for the first time, a spell of time is needed to get used to the wearing of it. Because of the distortion caused by the gradient of lens power, you sometimes may feel blurred in the peripheral part of the lenses. That is perfectly normal. You will adjust yourself to it in a few days or more.
After getting used to wearing progressive glasses, you will find it is a great help to you, sparing you the trouble of choosing bifocal or even trifocal lenses for the sake of seeing clearly.