Durable Progressive Multifocal Lenses For Reading Glasses 1.499 HMC Coating

Far And Near Vision 1.499 progressive HMC Progressive Multifocal Lenses For Reading Glasses
 
I. Specifications.

II. Features.

------What are progressive lenses?

      Progressive lenses are line-free multifocals that have a seamless progression of added magnifying power for intermediate and near vision.

Instead of having just two or three lens powers like bifocals or trifocals, progressive lenses are true "multifocal" lenses that provide a seamless progression of many lens powers for all viewing distances.With progressive lenses, you can look up to see clearly across the room and in the distance. You also can look ahead to view your computer in the intermediate zone and drop your gaze downward to read and do fine work comfortably through the near zone of the lenses.

------What is the corridor?

A "corridor" of optimum lens power runs vertically down each progressive lens. Your eye care practitioner will take careful measurements of your eyes and eyeglass frame in order to place the corridor in just the right location so your eyes can naturally access the various powers within the lens for comfortable viewing at all distances.

And progressive lenses eliminate an annoying problem caused by bifocal and trifocal lenses known as "image jump."

------what are the differences between the bifocal and the proressive.

In the past, bifocal lenses were used to correct two different eye prescriptions. Bifocals were easy to spot - they had a line dividing the lens in two, with the upper half for distance vision, and the lower half for reading. For many people, these were considered ugly and even inconvenient, as wearers would suffer from “image jump” when their focus flickered above and below the clearly-defined boundary of the two parts of the lens.

III. Coating Choice.
 
Depending on the layers of coating, lenses differ in functionality. Coating consists of much technicality as much as lenses do, here is 'how lens coating works' for your reference.

Hard Coating: To make the uncoated lenses are easily subjected and exposed to scratches