If your eye prescription is high, your lenses will need to be cut thicker to correct your vision correctly. Luckily, choosing higher index lenses for your glasses means they can be thicker and still correct your vision perfectly.

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High index lenses cause less distortion than lower index lenses with the same prescription. If your prescription is high and your lenses are large, it can result in your eyes looking smaller or larger, depending on whether you are near or farsighted. High index lenses reduce this effect.

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High index lenses are thinner, more powerful lenses. They're lightweight and stylish, but are mostly reserved for those with higher vision correction needs. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs!

EyeBuyDirect’s polycarbonate lenses are cut at a 1.59 lens index. We recommend these lenses for medium-strength prescriptions. Polycarbonate lenses are naturally 100% UV blocking and extra durable.

If you have a high eyeglasses prescription, high index lenses are recommended to ensure that your lenses are as thin as possible. As well as looking good, thin lenses reduce the total weight of your eyeglasses, making them more comfortable to wear for long periods of time.

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The lens thickness you should get depends on your prescription and lifestyle. Thicker lenses are more affordable, but can only accommodate lower vision correction needs. High index lenses are thinner, lightweight (and more stylish!), and can accommodate ALL kinds of vision needs, including higher prescriptions! A good compromise lies in 1.59 index polycarbonate indexes, which accommodate most prescriptions and are extra durable.

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High index lenses are made with a particular type of plastic that refracts light more effectively than standard index lenses. This usually means that they can be cut thinner than other lenses while providing perfect vision correction for stronger prescriptions.

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Now you’re all clear on the best lens index for your prescription; you’re ready to explore our massive range of men and women’s frames.

Measuring your pupillary distance (PD) is super simple. While you can probably have your local optometrist help you measure it, you can also do it yourself! Just follow these easy steps on our special "How to Measure Pupillary Distance guide". The only thing you need is our free-to-print PD ruler.

High index lenses are usually more expensive than lower index lenses because they’re made with more costly materials. The benefits of high index lenses make the extra cost worth it, though!

You can select the thickness of your lenses at EyeBuyDirect by choosing a lens index. The stronger your prescription is, the higher the lens index available to you. If you want your lenses to be as thin as possible, it’s a good idea to choose the highest lens index available to you.

The difference between your glasses' lens index can make a huge impact which is why learning about high index lenses’ meaning is important. Deciding which you should get depends on your prescription and your lifestyle. Thicker lenses are more affordable, but can only accommodate lower vision correction needs. Thinner lenses are lightweight (and more stylish!) and can accommodate MANY kinds of vision needs, including higher prescriptions. In terms of balancing price and quality, 1.59 index polycarbonate lenses accommodate most prescriptions and are extra durable.

So, what’s the difference between all the different lens index options shown in the table above? Let’s take a look and give you a better idea. Starting with 1.61 vs 1.67 high index lenses — the 1.67 lens is extremely thin whereas despite still being stylish, the 1.61 lens is extra-thin. The 1.67 lens is a great choice for extra-strong prescriptions. What about 1.67 vs 1.74 high index lenses? Well, you can probably guess that the 1.74 is thinner (the thinnest possible!). Go for 1.7.4 high index lenses if you have a high prescription and like your lenses extremely thin, lightweight, and stylish.

Lens index is a number that describes how thick or thin your lenses are. The higher a lens' index is, the thinner it becomes. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses.