Introduction to Prescription Eyeglasses!
Eye problems are quite common around the world. There are several eye problems that demand a person to wear. Among these, three very common eye problems that can be treated by wearing prescription eyeglasses are (a) Myopia or nearsightedness, the common symptoms of Myopia are blurred vision and helplessness to focus on distant objects. (b) Hyperopia or farsightedness, opposite of Myopia. The symptoms of Hyperopia are headache, eye fatigue after reading or watching television. (c) Glaucoma- the saturation of fluid on the retina. Glaucoma comes without any warning signs and it can cause loss of sight if left untreated. Hence, one should get his/her eyes checked up at least once a year for any eye problems.
The strength of prescription eyeglasses is measured in dioptres. A normal prescription will contain spherical dioptre values, cylindrical dioptre values, Axis Value and any addition values. Some commonly used abbreviations in an eyeglass prescription are: DV = D.V. is an abbreviation for “distance vision”. This specifies the part of the prescription designed primarily to improve far vision. NV = N.V. is an abbreviation for “near vision”. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens. O .D. is an abbreviation for oculus dexter, Latin for “right eye.” And O.S. is an abbreviation for oculus sinister, Latin for “left eye”. (Some eyeglass prescriptions simply say “left” and “right” instead of “O.S.” and “O.D.”)
The lenses of Prescription eyeglasses are manufactured from diversity of materials. Glass lenses (which was once upon a time the most commonly used material), it comes in several diverse colours and has very good scratch resistant properties. Also, it is the least expensive. Disadvantages of a glass lenses are (a) its heavy weight; (b) It is fragile. Another material that is used to produce prescription eyeglasses is high-Index artificial lens. It absorbs ultra violet rays very well. This kind of lens is much lighter in the weight than glass lens but at the same time it can also be scratched very easily. Resin Plastic is one more kind of the material used in manufacturing prescription eye lenses. These are the lightest of all the lenses and are very fast replacing the use of glass lenses. These lenses don’t offer high level of defence against the ultra violet light, but there are a variety of coatings available in the market which overcomes this shortcoming of these lenses.
A wide variety of coatings can be applied to prescription lenses. An Ultra Violet coat protects the eyes from harmful UVA and UVB rays. A scratch resistant coating to the prescription eyeglasses reduces the chances of scratches on the lens due to normal day to day handling. The most recent type of coating is the anti-reflective coating. It reduces mirror images as it allows light to pass through the lens.
People also get their prescription eyeglasses tinted with a wide variety of colours. Tints increase comfort in bright light situations, reduce glare from computer screens or fluorescent light, and make a fashion statement as well.
Today, not only are prescription eyeglasses a necessity, but to some people they are a fashion accessory as well. Top designers like Giorgio Armani, Eddie Bauer, Calvin Klein have picked up this latest fashion trend and have started designing their own collection of frames for prescription eyeglasses.
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