Invalid of single vision：
When people over 40 years old, one pair of single vision glasses might not be able to meet their requirements. They could see distance but not close, or could see close but not distance. At this time, they do need to wear two pairs of glasses, reading glasses when used to see close things and distance glasses to see distance. The other way is to wear multi-focal glasses, and the multi-focal glasses include bifocal and progressive glasses. The multi-focal glasses are one pair of glasses can be used to see distance and close up, you could use the upper farsighted part to see distance and the bottom part to see near things.
What's the difference between progressive and bifocal
1. Bifocals help you get far and near vision only, and will generate image jumps when you look near after you see distance.
2. You will get continuous vision at distant, middle, and near focal ranges with progressive lens, and with no lines, no annoying image jumps.
3. progressive lens will be more expensive than bifocals. But the extra price is worthy of its value.
Who need progressive glasses
1. As the human eye degrades with aging, lens gradually hardens, causing the eye to focus light behind rather than on the retina when looking at close objects. This is the presbyopia. This phenomenon is common among middle-aged and elderly people over the age of 40.
2. If you only have either myopia (nearsightedness) or hyperopia (farsightedness), you only need single vision lenses, but if you have presbyopia and one of those two vision problems at the same time, you need lenses that improve the way you see both near and far-away objects.
3. Some types of occupational progressive lenses are available for specific jobs. Tell your eye doctor if your need a special pair of glasses because of work. Like if you drive a car on high-speed road, you need look distance, and see how much oil is left.
4. Hence, if you need two pairs of glasses for reading and distance use, progressive glasses may fit you.
Our lab is equipped with machines from Satisloh and installed OPTOTECH and IOT software designs for freeform progressive lenses.Different designs are suitable for different purpose.
Post time: Feb-18-2022