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Well designed reading glasses are there to ensure your ability to see better at close distances, especially between 30 to 40cm (roughly 12 to about 16 inches). These lenses are known as convex lenses, or lenses that curve outward. These are perfectly designed for those who have prescriptions that begin with (+).
Single-vision glasses and lenses are mostly suitable to a majority of those who need eyewear, but the prescription and other lense may be unique and different to each individual. That is why it is also important to find the right pair of single-vision lenses that can correct the vision problems you need fixing, be it from close or far distances.
There is a percentage among the American population that end up suffering and living with nearsightedness. If this happens to you as well, then you should be looking for a pair of single-vision distance lenses that can help correct the visual problems your eyes may be having. These are read with prescriptions beginning with a (-) symbol and so, these lenses become concave lenses, or lenses that curve inward.
Often known as the most common type of correctional lenses, these are utilized to correct both close and long distance vision problems. This is done by combining both prescriptions and forming it into a single lens. How this happens is by allowing the upper region of the lens to be designed for the function of correcting distance and the bottom portion to fix nearsightedness. This type of lens are usually the better choice to have for those who need both visual corrections.
These are very unique lenses as they are designed for all three components of vision correction: long-distance, close-range, and middle-ground visual problems. Progressives are also known to be personalized among other types as they can correct problems for even the most unique of eye problems.
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What this does is that when being applied and developed for eyeglass wear, it is mostly used for those who suffer from eye problems such as diplopia (double vision). What double vision means is the eyes projecting two images of the same object. This happens because the light that enters the eyes of a person ends up entering at wrong angles, thus creating this two split image. With the help of prism correction, it can align the images into one image as intended. Due to how the shape of the prime is flat as well as transparent, it helps with bending the light needed to hit the eyes. This makes it easier for light to travel without needing to hit at the wrong angles, thus making things easier to see.
Known as also the index of refraction or the refractive index, it is a set of numbers that indicate the efficiency of the material needed for the lenses. The higher the number means the more refraction the materials needs to have in order to properly correct the visual problems of the individual. This also means more light being able to bend for you to see correctly.
Higher numbers also means higher prescriptions for the individual as well. For those who have strong prescriptions, the proper lens index would range up to 1.74. There are others that more thinner such as the 1.67 as they allow the light to be refracted without looking distorted.
Known as photochromic lenses, this type of lenses are the ones that we know to darken whenever they are exposed to intense light such as sunlight. They have a light-adjusting coat to them onto the lenses that allows for them to do this. This, much like regular sunglasses, are done to help the wearer be protected from intense UV rays that the sun tends to produce. These help also for those who would rather have one pair of eyewear that can act as prescription sunglasses too.
Solid Tints provide the same level of protection as well as fashion. The more tint the lens has, the more protection you will receive. That and some style for your wardrobe.
Polarized lenses are a special type of coating that reduces the reflection in the lenses that can be both disturbing and dangerous for the eyes. These coatings can come in many colors as well in order to fit the fashion taste of each eyeglass wearer.
Mirrored lenses have a special coating that are very reflective and also stylish. These are substitutes for sunglasses for many as they provide the same level of reflective protection.
These lenses have a dark tint to them at the top parts of the lenses and they get more light as they reach the bottom. These are to provide sufficient levels of UV light protection from the sun, but these come with a cost. Gradient Tinted lenses can only be applied for lenses that are above 36mm in terms of height.
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