Does High Cyl Increases Lens Thickness

What are high-index lenses?

High-index lenses are eyeglass lenses that are designed to exist thinner and lighter than regular lenses. They are more often than not recommended for people who have significantly loftier refractive errors and strong prescriptions for nearsightedness, farsightedness, or astigmatism.

Regular lenses that comprise a strong optical prescription usually require a thicker and heavier lens in order to bend low-cal more effectively and correct the high refractive error.

While both regular and high alphabetize lenses function in the same manner, loftier alphabetize lenses are designed to bend light more than efficiently — leading to thinner and lighter lenses.

Schedule an appointment with an centre doctor to find out if high-index lenses are a proficient fit.

What is a refractive index?

The refractive index is the number that represents how efficiently a lens textile bends calorie-free, and is dependent on how quickly calorie-free travels through the material.

Regular plastic lenses take a refractive index of 1.fifty.

This alphabetize is adequate for correcting balmy to moderate refractive errors, but is not as effective for the correction of college refractive errors.

A high-index lens may be recommended if your optical prescription is above 2.00 diopters.

High-index lenses have a refractive alphabetize above 1.fifty— ranging from 1.53 to 1.74.

The prototype below compares the lens thickness of a regular plastic lens (one.50) to the most commonly prescribed high-index lenses.

Notation: The higher the refractive index, the thinner the lens.

According to this table, a lens with an index of 1.74 could be up to 50 percent thinner than a regular plastic lens with an alphabetize of 1.50, with the same optical prescription.

Polycarbonate lenses have a refractive alphabetize of i.59.

Polycarbonate lenses are impact resistant and offering increased durability, but are generally only recommended for children's glasses, sports eyewear and safety goggles because they don't provide the same level of visual clarity, when compared to other plastic lenses.

If you need high-index lenses contact an eye physician nigh you to start improving your vision.

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Why choose a loftier-alphabetize lens?

If y'all have a strong prescription and are looking for thinner, lighter lenses with a more bonny appearance, high-alphabetize lenses are the fashion to go.

Thinner lenses

In full general, the stronger the prescription, the thicker the lens will be.

A lens for nearsightedness is designed to be thinner in the center merely thicker around the edges. With a strong prescription and regular thick lenses, your pick of eyeglass frames will be limited— especially if you lot were hoping to purchase rimless or semi-rimless frames.

More recently, the newest trends in eyeglass frames include plastic and metal rimless frames, as well as frames that contain thinner rims which expose the edge of the lens.

With a thicker lens, these types of frames can be less bonny and too more difficult to habiliment, as thicker lenses are not as secure within the frame and are more than likely to pop out.

With thinner high-alphabetize lenses, you lot will no longer demand to worry about the appearance of your lenses and you will gain a larger multifariousness of frames to choose from.

Lighter lenses

High-index lenses incorporate less material than regular lenses and are therefore lighter and more than comfortable.

Regular lenses for a strong farsightedness prescription can be quite heavy. High-index lenses even so, don't require every bit much lens cloth and will result in longer lasting comfort.

Too, as opposed to lenses for nearsightedness which are thicker on the edges, lenses for farsightedness are thicker in the center. With regular lenses, this can significantly magnify your eyes and may brand you feel a bit self conscious at times.

High-index lenses contain a unique aspheric design which facilitates a flatter lens curvature, leading to reduced magnification and improved appearance.

Other advantages

High-alphabetize lenses are more often than not scratch resistant and can fit into nigh any type of frame. They can also be treated with anti-scratch, anti-reflective, and UV-protection coatings to meliorate vision and lens durability.

Disadvantages of high-index lenses

Before choosing loftier-alphabetize, speak with your eye doctor to determine if these lenses are necessary for your individual prescription.

While high-alphabetize lenses tin can be beneficial for certain optical prescriptions, they can also be more than expensive than regular lenses.

Many centre care professionals also recommend adding anti-reflective and anti-scratch coatings to high-index lenses to improve vision and lens durability — this volition further increase the overall cost of your new eyeglasses.

Also, it is important to know that high-alphabetize lenses are typically more frail than regular lenses and need to be handled with a bit more care.

Before purchasing new lenses, discuss the advantages and disadvantages of high-index lenses with your center medico.

High-index lenses can improve lens comfort and appearance, and can even open the door to a larger variety of frames. High-index 50 enses may be just the solution yous have been searching for.

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Contact an eye doctor about you to find out which lenses are best for you and your eyes.