Guide to Eyeglasses

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.
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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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What one must know of eyeglasses: People with presbyopia are supposed to buy reading glasses from eye doctors, rather than simply pick up one pair from drugstores. On one hand, those one-size-fit-all reading glasses are problematic for people with different prescriptions in two eyes, resulting in side effects such as headache. On the other hand, regular eye exams from eye doctors can detect underlying vision problems as early as possible.
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New lenses that change in shading: Trivex is a mid-index plastic that is also lightweight and durable. Now this material has been used to manufacture Definity progressive lenses by Essilor of America. The company claims that these new Definity lenses provide a wider view of distance vision as well as a better aligned intermediate vision. Currently these lenses are available in clear, Transitions IV photochromic gray or brown.
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Common issues of eyeglass frames: The size of eyeglass frames also has standard format, such as 48-19-140. The first number is the size of the lenses and the second number represents the bridge size. The third one indicates the temple length. Different wearers require individual frame measurements and fitting. With these standardized size measurements, manufactures can provide accurate eyeglass frames.
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Common issues of prescription eyeglasses: Some people think that eyeglass wearing makes the wearer rely on them. In fact, eyeglass wearing causes no permanent visual change. Based on the misconception, those people are not willing to wear eyeglasses when they just feel good with the vision. But in sometimes, their actual vision is burry, thus bringing more risk when they are driving on the highway, especially at night.
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The evaluation of various safety glasses: Prevent Blindness America reports that 700,000 cases of eye injuries happen at work every year in the United States, and the figures of eye injuries at home and during sport are 125,000 and 40,000 respectively. It is also estimated that 90% of these injuries can be prevented by proper protective eyewear.
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Selection for Children eyeglasses: In addition to functional demands, children’s eyeglasses are always fun, durable and safe. Although the eyeglass styles worn by adults may be significantly different, some children like those styles. Those adults-oriented designs such as elongated rectangular shapes, small, retro-styled oval frames and even titanium frames are available for children now.
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Photochromic and tinted lenses: Currently, photochromic lenses are available in materials including glass, polycarbonate and high-index. There are also various tints and brands for your selection.
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Regular and task-specific occupational multifocal glasses: Technological improvement of eyeglass lenses has brought much more options to customers. The period in which people with presbyopia were forced to wear the Franklin style bifocal lenses with visible lines across the lens has gone forever. Currently, new types of multifocal lenses are available, not to say various specialty eyeglasses such as computer glasses exclusively for intermediate vision.
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