Nowadays, many people need prism corrections. Some of them have been wearing prescription glasses with prism correction for decades, but still not sure about the exact meaning of prisms and how they work. Read this article to learn more information about prisms:
In general, prisms are used primarily for double vision, positional correction, or convergence correction. A Prism indicates a more delicate condition, it will help you to correct some special conditions or some eye disorders like lazy eye, crossed eye, squints etc. When both of your eyes are not properly aligned when you look directly at the same thing, Prism can be ground into the lenses in order to re-align them. This can occur with squints or in situations where the eyes are properly aligned but are under a tremendous amount of strain in order to keep them aligned. The value under the ‘prism’ heading signifies the strength of the prism. The measurement is Diopter. The value may be as high as 10 and may go up in steps of ½ or 1 Prism Diopters.
Prisms have four q positions, the rotation of the prism that is usually specified as BI(base in) which means towards the nose or BO(base out) or BU (base up) or BD(base down). Orientations between these four positions can also be specified by using combinations of horizontal and vertical prisms in the same lens.
If your prescription contains a prism, you will have to pay more attention, for accurate measurements are needed to be taken when you’re wearing the prescription glasses. Strictly speaking, if your eye doctor prescribed prism eyeglasses for you or your kids in a new eyeglass prescription. We would recommend you purchase prescription glasses at your opticians or at a reputable online eyeglass store.
PrescriptionGlassesOnline.net is one of the best on-line eyeglass stores in the USA selling high quality yet cheap prescription glasses, discount prescription glasses, cheap prescription sunglasses and other type prescription glasses. They do prism corrections on both single vision lenses and bifocal lenses with a small additional charge $20-$50 depended on customer’s prescription. They take great pride in maintaining highest quality standard and the lowest discounted price in the industry. Best materials and latest technology were used in making each pair of eyeglasses, and their certified technicians mechanically test and visually inspect each pair of glasses before sending each order out.