http://www.lensociety.com/bifocal-sunglasses-3/
Details about the Prescription bifocal sunglasses
Some people say the reason that the world develops quickly may be due to people’s laziness. When people don’t want to walk, they invent cars. When people don’t want to climb stairs, they invent elevators. When people don’t want to swing a fan, they invent air conditioners. Due to the mind of laziness, the society makes quick progresses. It does the same to the eyeglasses developing history. People are not satisfied with the sunglasses which can only prevent strong lights and protect eyes from being hurt. The simple UV rays preventing function causes great inconveniences for people with eyesight problems because they cannot see clearly with the common sunglasses. They require the sunglasses to correct their eyesight, which are the prescription sunglasses. For the old people with myopia and presbyopia problems, prescription bifocal sunglasses may be the most suitable ones. They differ from ordinary sunglasses in lens focal points. The bifocal sunglasses have two different focal points, which mean the lenses are divided into two parts, the upper part and the lower part. Ordinary sunglasses only have one focal point, so it’s not fit for people who have both nearsighted and presbyopic eyesight problems.
Though bifocal sunglasses are of high technique and value, the manufacture technology is quite mature and at the same time they can be available at many places. Sometimes, people are not willing to go to an optometrist or ophthalmologist for a complete check on their eyes. Instead, they buy glasses on the internet or go to some glasses shop with the only information of diopter that they measured years ago. Actually, it’s quite dangerous, especially when comes to the bifocal sunglasses. It’s necessary and suggestible for all the people to go to get a detailed prescription from an optometrist or ophthalmologist and then go to opticians to get a pair of prescription bifocal sunglasses.
Eyeglasses prescriptions are only allowed to written by an optometrist or ophthalmologist. They contain some terms that must be filled in and some terms that can be left empty. The most important items are the D.V. and N.V.. D.V. is an abbreviation of “distance vision”. It indicates a single vision lens fitting for distance vision which is the diopter of the top of the bifocal sunglasses’ lenses. N.V. is an abbreviation of “near vision”. This represents a single-vision lens prescription to improve near work which is the reading portion of the bifocal lenses. It’s the diopter of the bottom part of the bifocal sunglasses’ lenses. At the same time, PD is also a vital index for bifocal sunglasses. PD means ‘Pupillary Distance’. When matching a pair of bifocal sunglasses, PD is necessary for the upper and the lower lenses’ pupillary convergence differing from each other when you stare at one point. Only with all of the above mentioned information you can say you are likely to match a right pair of prescription bifocal sunglasses.
Ordinary sunglasses are obviously not suitable for people with some eyesight problems. It is better for them to wear the prescription bifocal sunglasses. They are sure to find that this kind of sunglasses is of great comfort and would like to share their experiences of wearing the prescription bifocal sunglasses with their friends.
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