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Technology

High-Index Lenses: An Advanced Technology in Glasses

High-index prescription lenses are the right fit for you if you have a high prescription but want your glasses to be light and comfortable.

These lenses are generally prescribed if you have a strong refractive error such as myopia, hyperopia or astigmatism. They will make your eyeglasses thinner and more comfortable to wear all day.

Almost 75% of people in the UK use some type of corrective lenses to see clearly and thus high-index lenses are the most commonly used lens type in prescription glasses online.

To make sure that your glasses don’t get in the way of your daily activities, they need to be lightweight and easy to carry around. The advent of these thin lenses has also increased the manufacturing of thin frames which were incapable of holding thick lenses in place.

There is more to the high-index lenses than meets the eye. Learning the basic features of these lenses will help you determine whether they are right for you.

What are high-index lenses?

High-index glasses allows the people that are too nearsighted or too farsighted to wear thin and lightweight lenses. These lenses have a higher index of refraction that bend the light rays more effectively for a better vision clarity.

Many people who wear glasses are mostly nearsighted. So they are required to wear lenses that are thick around the edges and thinner in the middle. Thin lenses are easier to fix in most frame styles including rimless glasses and they are usually scratch resistant.

All of the fashionable glasses online or in physical stores have high-index lenses as they are lightweight and stylish.

Regular lenses vs high-index lenses

Spectacles work by bending the light rays as they pass through the optical lenses. Your lens power is described as the light bending ability of your glasses and is provided in the prescription given by your optician.

Lens power is measured in Dioptres (D). If you are farsighted, your lens prescription would be in (+) measurements. For instance, you can have a lens power of +2.00D.

If you are nearsighted, your lens prescription will be in (-) measurements, for example -2.00D. If you are too nearsighted, your prescription might say -8.00D.

The standard lenses for high prescription powers are thick and heavy. Luckily, lenses manufacturers have come up with high-index lenses that are thin no matter how strong the power is.

Normal farsighted lenses have thick edges which can distract from your glasses. High-index prescription lenses eliminate this problem with their aspheric design. They have a thin center and a flat lens curvature.

Different types of high-index lenses

The refraction index of your glasses determine their ability to bend the light and give clear vision which depends on how fast the light passes through the lenses. The most common lens types that have high-index refraction are:

  • Polycarbonate
  • Progressive
  • Polarised
  • Photochromic
  • Aspheric

You can add protective coatings on these lenses to make them more durable and multi-functional. For instance, you can add a blue light coating on them and turn them into blue light glasses that you can wear when working on a digital screen.

Other protective coatings that you can get for your lenses are Anti-Glare, Anti-UV, Anti-Scratch and impact resistant. If you want all of these 4 coatings for free, you can buy your glasses from companies such as Specscart.

Who should go for high-index lenses?

These types of lenses are ideal for people who have a refractive error such as astigmatism, myopia or hyperopia. When you have a refractive error, your eyes become inncompetent to bend the light rays on your retina.

Conventional plastic lenses have a refractive index of 1.50 which can get to 1.52 in case of glasses lenses. If your lenses have a refractive index more than these figures, they have a high-index.

But, you will  have to pay a higher price for a higher index. However, when you buy them online, you can get cheap glasses with thin lenses for your strong prescription.

High-index lenses are ideal for anyone who doesn’t want their eyes to bury beneath the weight of their glasses. Get an eye exam first and know your latest prescription. Consult with your optometrist or ophthalmologist to decide whether you can benefit from these types of lenses. Also, based on your lifestyle, select the protective coatings that you will want on your lenses.

Author:-  I’m Jaylin: Guest post service planner of Leelija and full time blogger. Favourite things include my camera, traveling,caring my fitness, food and my fashion. Email id: editor@leelija.com

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