Reviewed by: Dr. Matthew Miller, OD on May 13th, 2020

Lens Index

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.

Lens Indexes at EyeBuyDirect

Lens Indexes

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What are high idex lenses and what's the difference?

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!

The difference between your glasses' lens index can make a huge impact. 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.

What are high idex lenses and what's the difference?

Recommended lens index

Lens index Features SPH CYL
Lens index 1.5
1.5 INDEX LENS Conventional single-vision lenses. Available starting from $0. + 2.25 to -2.25 +/- 2.00
or below
Lens index 1.57
1.57 INDEX LENS For people with moderately-strong prescriptions. Thinner and lighter than standard lenses. -2.50 to -5.00
or
+2.50 to +5.00
+/- 3.00
or below
Lens index 1.59
1.59 INDEX LENS Made with premium polycarbonate. Features 100% UV protection. Durable and impact-resistant. -4.25 to -6.75
or
+4.25 to +6.75
-2.25 to -3.00
or
+2.25 to +3.00
Lens index 1.6
1.6 INDEX LENS Stylish and extra-thin. Great choice for stronger prescriptions. -4.25 to -6.75
or
+4.25 to +6.75
-2.25 to -3.00
or
+2.25 to +3.00
Lens index 1.67
1.67 INDEX LENS Extremely thin. Good choice for extra-strong prescriptions. -7.00 to -9.00
or
+7.00 to +9.00
-3.25 to -4.00
or
+3.25 to +4.00
Lens index 1.74
1.74 INDEX LENS As thin as possible Best for the highest prescriptions. +/-9.25 and above -4.25 to -6.00
or
+4.25 to +6.00

How do I measure my PD?

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.

How do I measure my PD?

You’re all set!

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.

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