Are Reading Glasses Just Magnifiers?
Sat, Apr 02, 22 By : Koalaeye
Types of Single Vision Lenses Single vision lenses come in several different types including the 1.59 polycarbonate single vision, 1.57 mid-index single vision and polarized single vision. 1.59 polycarbonate single vision lenses are characterized by their durability and impact resistance. They often include an anti-scratch coating or anti-reflective coating. This lens is much lighter and thinner than a traditional plastic lens, and it blocks the sun’s harmful UV, offering maximum UV protection. 1.57 mid-index single vision lenses are thinner than...

Types of Single Vision Lenses

Single vision lenses come in several different types including the 1.59 polycarbonate single vision, 1.57 mid-index single vision and polarized single vision.

1.59 polycarbonate single vision lenses are characterized by their durability and impact resistance. They often include an anti-scratch coating or anti-reflective coating. This lens is much lighter and thinner than a traditional plastic lens, and it blocks the sun’s harmful UV, offering maximum UV protection.

1.57 mid-index single vision lenses are thinner than regular plastic and moderately lighter and stronger. They come with an anti-scratch coating or anti-reflective coating. These lenses are an ideal option for people with relatively higher prescriptions. But they are thicker than the polycarbonate lenses.

Polarized single vision lenses are sunglasses that protect your eyes from light that bounces off smooth, highly reflective surfaces like asphalt, snow, and water. These lenses work by controlling certain light properties and limiting specific wavelengths. They boast a vertical filter that does not allow horizontal glare to pass through.


Advantages of Metal Frames

The metal frame of eyeglasses conforms to the use performance of the frame. They need the material to have high fracture strength, enough plasticity, toughness, and good elasticity. And after the disappearance of the external force, they can restore to the original shape. This is the regular demand for the high elasticity of the metal frame. They must be able to withstand the atmosphere and human sweat daily corrosion. Usually, the corrosion resistance of pure titanium eyewear will be better than other eyewear. Some glasses will have a variety of wonderful grinding designs, and the material must have high plasticity.



Transition Lenses Problems

It is not convenient to rely on photochromic lenses when driving. It also may be unsafe if the driver depends on the prescription to see or is legally bound to wear prescription lenses when driving.

Besides, transition lenses are typically the size and shape of regular vision-correction lenses, which allows them to accurately correct the field of vision, but does not account for peripheral areas on either side of the visible range. Sunglasses operate by maintaining very dark glasses that expand over the field of vision and the peripheral with large, oblong lenses that block sunlight from both the front and sides. However, transition lenses are not typically dark enough for heavy sun and cannot block light penetration on the peripheral, leading to people having to resort to sunglasses again.

Of course, there are some benefits of transition lenses and you can click here to learn more.


Selectspecs

In addition to Ray-Ban, Vogue、Fendi, and other first-line eyewear brands, Selectspecs also owns many affordable and self-owned eyewear brands, among which Infinity is the representative brand of youth and fashion.

But the texture will not lose to a line brand. And the choice is very rich. The classic black-rimmed glasses, or the stylish metal-rimmed glasses, or the tortoise-shell glasses with a retro vibe, are brimming with youthful fashion.

The fashion sense of Infinity is stronger, in line with the aesthetic of young people today. There are many fashion trend items, very suitable for building your personal image. There are many styles of glasses, such as classic black frames and popular gold frames.



What are NXT Lenses?

NXT lenses are made of Trivex materials. Trivex (Chinese name: Ethyl Carbamate Polymer) was invented by PPG in 2001.

Impact resistance:

Impact resistance is the main feature of the NXT lens. As a visual armor material originally used in the military field, Trivex has effective impact protection to the eye when it is most demanded. It is 10 times stronger than PC lenses in impact resistance and will last for life under normal use. It is the only explosion-proof safety lens on the market that can withstand external forces and turns.

Patented color injection technology :

Color representation is another important feature of NXT lenses. The biggest defect of the regular lens in dyeing is color aberration. The same color of the lens with different luminosity will produce different effects. The higher the refractive index, the serious the error. NXT lenses are a breakthrough in this respect. The patented color injection technology that infuses the color into the raw material gives the lens a natural color, ensuring that color aberrations are minimized and that they do not fade or change color over time or over long periods of use like other materials.

Abbe number and internal stress:

The Abbe number of NXT lenses made of Trivex is 43~45, which is close to CR39(58) and higher than PC lenses (29~32) and high folding lenses (32~41). At the same time, because the NXT lens is produced by the casting process, there is no stress in the finished lens, which further reduces the rainbow phenomenon, providing a guarantee for the clear visual effect and reducing eye fatigue.

Weight:

The specific gravity of NXT lens is 1.11g/cm3, 16% lighter than CR39 (1.32g/cm3) and 10% lighter than PC tablet (1.22g/cm3). The Trivex 1.53NXT medium-fold lens is so light that it can float.


How are we nearsighted?

The light from external objects to the eye needs to be refracted by the lens before it can be imaged on the retina. The refractive power of the lens depends on the contraction and relaxation of the ciliary muscle. When we look at close objects, the ciliary muscles contract and the lens becomes thicker. When we look at distant objects, the ciliary muscles relax and the lens becomes thinner. Adjust the focal length of near and far objects so that they will show a clear image on the retina. If you use your eyes too often and the longer the ciliary muscles work continuously, the ciliary muscles will spasm because of too much tension. At this time, the lens cannot be adjusted and thinned. After the light from a distant object is refracted by the lens, the imaging position will fall in front of the retina instead of on the retina. Only a blurred image can be seen, which becomes myopia.

There is another situation. For some people, due to genetic factors, in the process of growth and development, the front and rear wheelbase of the eyeball will gradually become longer. In this way, although the adjustment function of the ciliary muscle and the lens is normal, the image formed will also fall in front of the retina due to the longer the axis distance of the eyeball, which can also cause myopia.

The two causes of myopia are different. Myopia caused by ciliary muscle spasm is called 'pseudo-myopia'. As long as the ciliary muscles are relaxed, myopia can be reversed. Myopia caused by the extension of the wheelbase of the front and back of the eyeball is called 'true myopia', which cannot be reversed and can only be corrected by myopia glasses.



MODERN OPTICALS

It has been one of the most reliable eyeglasses stores in Houston since 1989. They provide precise technology and customer-focused services.They provide a wide range of sunglasses including branded sunglasses, designer frames, and contact lenses. Their main advantage is the world-class quality of their products and services. They have artfully moved beyond the conservative boundaries of the Lens Retail industry and are growing and expanding their business across the country. They provide a wide variety of designer glasses, sunglasses, safety glasses and sports glasses, and more.

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