The invention and proper use of bifocal eyeglasses
The first pair of eyeglasses was invented in the 13th century for people to magnify objects they want to see. Using convex lenses, it was used to compromise farsightedness, which is the inability to see items nearby clearly. Later in the 24th century, nearsightedness was also correctable by using concave lenses.
More...How to choose replacement sunwear lenses for different sports
You may have great sunglasses which are extremely expensive, and you love to wear them very much. But the chances are that you get the lenses scratched or your lenses are crashed. Then you need the replacement lens. Or in other situations, your job needs you to adapt instantly to any weather conditions, and you find the only one glasses will not work at that time. You also need the replacement lens to help you to shift quickly to the different circumstances.
More...What eyesight disorders can vision lenses correct?
When we are talking about lenses, we mostly refer to the camera lenses and vision lenses, these are all optical lenses. Here let’s talk about vision lenses.
More...Visual benefits and adaption problems of progressive glasses
Not long ago, people have to wear conventional lined glasses if they have presbyopia and other near vision problems. It is true that those glasses have benefited them a lot. However, just because of their characteristic- lined, there are some very evident vision areas in each pair. Therefore, some wearers can not get used to very radical vision change with those glasses. Or some of them will suffer from very serious dizziness or headaches with them. But once the technology permits, such problems can be solved. And with the development of progressive glass technology, some ideal products for those problems come into the market- progressive glasses.
More...Progression of bifocal and trifocal lenses
Eyeglass lenses have advanced to offer more options for various vision problems. One convincing example is the invention and progression of multifocal lenses for presbyopia correction.
More...Polarized sunglasses for outdoor activities
Polarized sunglasses were originally used to reduce reflected glare from the water in boating and fishing fields. With the development of polarized sunglasses, many others who participate in outdoor activities that require clear vision, such as skiers, bikers, golfers, joggers and so on are also interested in polarized sunglasses. Polarized sunglasses not only can reduce the glare from long, flat surfaces, but also are suitable for light-sensitive individuals working indoors, such as those continually exposed to light throw windows.
More...Proper usage of regular and multifocal reading glasses
Progressive addition lenses are mostly great for all distances. With soft design, these lenses provide acceptable and comfortable vision. Some eye doctors also think that progressive lenses offer much more natural and usable vision than bifocals and trifocals. Unlike bifocals and trifocals, progressive lenses have as many as nearly 20 focal points. There are many notable brands available such as Zeiss. Incorrectly positioned progressive lenses can cause blurry vision. Plastic markers can be used to check the right positioning of progressive lenses, both side to side and up and down.
More...Standard and modified occupational multifocal lenses
Most people with presbyopia get satisfying vision correction from conventional bifocal or trifocal lenses. But for those spending all day long in a job or hobby that requires only near vision or distance vision, special occupational bifocals or trifocals are needed. These special occupational multifocal lenses have unusual placement of near, intermediate and far vision zones in the lenses, meeting different, specific needs.
More...Various types of reading glasses
People with presbyopia have difficulty in reading close materials and they need reading prescription in their lenses. While many presbyopic individuals resort to bifocals, trifocals and progressive lenses, single-vision reading glasses are more suitable for a person who is a first-time eyeglasses wearer.
More...New types of eyeglass lenses
Blue-blocking lenses are traditionally used to block those harmful blue rays. However, blue-blocking lenses have been proved by scientists from John Carroll University in Cleveland to provide additional benefits. These new lenses are claimed to benefit people who have difficulty falling asleep at night. Blue light rays are supposed to delay the production of melatonin, which helps induce sleep as part of natural biological clock. In this case, by blocking blue rays during several hours before bedtime, these blue-blocking lenses can actually improve sleep patterns. In addition, those researchers say that blue-blocking lenses can also reduce symptoms of attention-deficit hyperactivity disorder.
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