1.56 vs 1.60 vs 1.67 Lenses: Which Is Right for You?

If you've ever purchased prescription glasses, you've probably been asked whether you'd like 1.56, 1.60, or 1.67 lenses.

For many people, these numbers can be confusing. Does a higher number mean better quality? Are thinner lenses always worth the extra cost? Which option gives you the best value?

In reality, the best lens index depends on your prescription, the frame you choose, and your personal preferences.

This guide explains the differences so you can confidently choose the right lenses for your next pair of glasses.

Quick Answer

If you have a lower prescription, 1.56 lenses are usually the most cost-effective choice.

For moderate prescriptions, 1.60 lenses provide a good balance between thickness, weight, and price.

If you have a stronger prescription or prefer larger frames, 1.67 high-index lenses are often recommended because they are noticeably thinner and lighter.

What Does Lens Index Mean?

Lens index refers to how efficiently a lens bends light.

A higher lens index bends light more effectively, allowing the lens to be made thinner while providing the same prescription.

This means:

• Higher lens index = thinner lenses

• Higher lens index = lighter lenses

• Better cosmetic appearance for stronger prescriptions

However, a higher lens index does not mean clearer vision. Regardless of the lens index, your prescription remains the same.

If you've noticed changes in your vision or think your prescription may have changed, it's important to have your eyes examined regularly. The Singapore Health Promotion Board (HealthHub) provides useful information on eye health and regular vision care.

Comparing 1.56, 1.60 and 1.67 Lenses

1.56 Lenses

1.56 lenses are the standard option for most prescriptions.

They offer excellent optical clarity while remaining the most affordable lens index available.

Best suited for:

• Lower prescriptions

• Smaller frame sizes

• Budget-conscious buyers

• First-time glasses wearers

If your prescription is relatively mild, upgrading to a higher lens index may not provide a noticeable difference.

1.60 Lenses

1.60 lenses are a popular upgrade because they provide a good balance between price and performance.

Compared to 1.56 lenses, they are thinner and lighter, making them more comfortable for everyday wear.

Many people with medium prescriptions find that 1.60 lenses offer the best overall value.

Best suited for:

• Medium prescriptions

• Everyday office workers

• Larger frame designs

• People wanting thinner lenses without paying for the highest index

1.67 High-Index Lenses

1.67 lenses are designed for stronger prescriptions.

Because they bend light more efficiently, they can be made significantly thinner than standard lenses.

This helps reduce the thick edge appearance often associated with higher prescriptions, especially when using larger or full-rim frames.

Best suited for:

• Higher prescriptions

• Larger fashion frames

• People looking for lighter glasses

• Those who prefer a slimmer, more premium appearance

Does a Higher Lens Index Improve Vision?

This is one of the biggest misconceptions.

The answer is no.

Your prescription determines how clearly you see.

A higher lens index simply allows the lens to be made thinner and lighter.

Think of it like two water bottles that hold the same amount of water—one is tall and slim, while the other is shorter and wider. The amount of water doesn't change, only the shape of the bottle.

The same principle applies to spectacle lenses.

Which Lens Index Should You Choose?

As a general guide:

Choose 1.56 if:

• Your prescription is relatively low.

• You want the most affordable option.

• You're using smaller frames.

Choose 1.60 if:

• You have a moderate prescription.

• You want thinner lenses without paying for premium options.

• You wear your glasses all day.

Choose 1.67 if:

• Your prescription is higher.

• You want the thinnest possible lenses.

• You prefer larger or fashionable frames.

• You value a lighter pair of glasses.

Ultimately, the best choice depends on your prescription and the frame you've selected. A qualified optician can recommend the most suitable lens index based on both factors.

Frequently Asked Questions

Are 1.67 lenses always better?

Not necessarily.

For lower prescriptions, the difference in thickness may be minimal, making 1.56 or 1.60 lenses a more cost-effective choice.

Are thinner lenses stronger?

No.

Lens index affects thickness, not durability.

The durability of your lenses depends on the lens material and any protective coatings, not simply the index number.

Do thinner lenses weigh less?

Yes.

Higher-index lenses are generally lighter because less material is required to achieve the same prescription.

Are high-index lenses worth it?

If you have a stronger prescription, high-index lenses often provide noticeable improvements in comfort, appearance, and weight.

For lower prescriptions, the benefits may be less significant.

Final Thoughts

Choosing between 1.56, 1.60, and 1.67 lenses isn't about selecting the "best" lens—it's about choosing the option that best suits your prescription, frame, and lifestyle.

If you're unsure which lens index is right for you, speaking with an experienced optician can help you make an informed decision based on your vision needs and budget.

At OpticQ, we'll explain the differences clearly so you can choose with confidence, without paying for upgrades you don't need.

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