High-Index Replacement Lenses for Your Existing Frames
Replace thick, outdated or changed prescription lenses with thinner high-index lens options while keeping compatible frames you already own.
RenewLens offers online high-index lens replacement for customers who want to reduce visible lens bulk, update a prescription or upgrade their lenses without automatically buying a completely new pair of glasses.
What Are High-Index Replacement Lenses?
High-index lenses are prescription lenses made from materials that bend light more efficiently than conventional plastic. Because the material has a higher refractive index, a prescription can often be produced with less lens thickness.
This is particularly useful when a stronger prescription would otherwise create noticeably thick edges or centers.
High-index materials can reduce visible lens bulk when compared with lower-index materials in suitable prescriptions.
Reducing visible edge or center thickness can improve the cosmetic appearance of strong prescription glasses.
If your existing frame remains suitable, new high-index prescription lenses can often be installed without replacing the frame.
When Should You Consider High-Index Lens Replacement?
Replacing your existing lenses with high-index lenses may make sense when:
- Your existing prescription lenses look thick or bulky
- Your prescription has changed
- You want a thinner lens profile
- You like your existing frames and want to keep them
- You are comparing 1.60, 1.67 or 1.74 lens materials
- You want to upgrade lens technology without changing frame style
Strong Prescription Does Not Automatically Mean 1.74
The highest refractive index is not always necessary. A well-selected frame with 1.67 may sometimes produce an excellent cosmetic result.
Compare 1.67 vs 1.74 →Compare High-Index Lens Materials
Material choice should be based on the prescription and frame, not the index number alone.
| Lens Material | General Position | Main Benefit | When to Consider |
|---|---|---|---|
| 1.60 Thin Lens | Entry high-index option | Provides thickness reduction compared with standard plastic in appropriate prescriptions | When moderate thickness reduction is desired |
| 1.67 High Index | Popular stronger-prescription choice | Greater thickness reduction than lower-index materials | When visible lens thickness is an important concern |
| 1.74 Ultra High Index | Higher-index clear lens option | Can provide additional thickness reduction compared with 1.67 | When maximum practical thinness is especially important and the prescription and frame can benefit |
What Actually Determines High-Index Lens Thickness?
Prescription
Stronger sphere and cylinder values can increase the amount of lens power and thickness required.
Frame Dimensions
Large lens openings can make edge thickness more noticeable, especially in stronger minus prescriptions.
PD & Position
The relationship between your eyes and the frame affects decentration and finished lens geometry.
Lens Design
Base curve, optical design and minimum thickness requirements can all influence the finished result.
High-Index Lenses for Minus and Plus Prescriptions
Reducing Edge Thickness
Nearsighted prescriptions are generally thinner through the center and thicker toward the edges. Higher-index material can help reduce visible edge bulk.
Smaller, well-centered frames can also make a significant difference.
Managing Center Thickness
Farsighted prescriptions are generally thicker through the center. High-index material and appropriate frame dimensions can help manage the finished lens profile.
Can Existing Thick Prescription Lenses Be Made Thinner?
Finished prescription lenses generally cannot simply be ground thinner while preserving the same optical result. Removing material changes the geometry of the lens.
When thinner lenses are needed, the normal solution is to manufacture new prescription lenses using an appropriate high-index material, lens design and frame configuration.
Anti-Reflective Coating for High-Index Lenses
High-index lenses can show more noticeable surface reflections than some lower-index materials. For this reason, an anti-reflective coating is an important option to consider when ordering high-index lenses.
A quality AR coating can reduce distracting reflections and improve the cosmetic appearance of the lenses.
Learn About Anti-Reflective Coating →High-Index Replacement Lenses for Progressives
High-index materials are not limited to single-vision prescriptions. Many progressive lens designs can also be produced in high-index materials.
With progressive lenses, material selection should be considered together with the full prescription, ADD power, frame dimensions, fitting measurements and progressive design.
Explore Progressive Lens Options →Can High-Index Lenses Be Installed in Existing Frames?
In many cases, yes.
Existing frames may be suitable for new high-index prescription lenses when the frame remains structurally sound and works with the prescription, lens material and mounting requirements.
Many plastic, acetate and metal full-rim frames can be relensed when they remain in suitable condition.
Rimless, semi-rimless, drilled and grooved frames require additional attention to material and thickness requirements.
Worn, cracked, unstable or heavily distorted frames may need additional review before lens production.
Why Replace the Lenses Instead of the Entire Pair?
- Keep frames that already fit comfortably
- Preserve a frame style you like
- Update an old or changed prescription
- Upgrade to thinner lens material
- Keep designer, specialty or difficult-to-replace frames when suitable
Bought New Frames Somewhere Else?
RenewLens can also install prescription lenses in many eligible new frames purchased from another retailer.
Add Prescription Lenses to Frames →How Online High-Index Lens Replacement Works
Choose Your Lenses
Select the lens type and available high-index option appropriate for your order.
Provide Your Prescription
Submit the prescription information required to produce your replacement lenses.
Send Your Frames
Use your own secure packaging or request the available shipping-kit option.
Receive Updated Glasses
Compatible frames are fitted with the new prescription lenses, inspected and returned to you.
High-Index Lens Guides
High-Index Replacement Lens FAQs
What are high-index replacement lenses?
High-index replacement lenses use materials that bend light more efficiently than standard plastic. This can allow stronger prescriptions to be produced with less visible thickness.
Can high-index lenses be put into my existing frames?
Many existing frames can receive high-index replacement lenses when the frame is structurally sound and compatible with the prescription, lens material and mounting requirements.
What is the difference between 1.60, 1.67 and 1.74?
These numbers refer to refractive index. Higher-index materials can provide greater thickness reduction in appropriate prescriptions, but the best option depends on your prescription, frame and lens design.
Are 1.74 lenses always better than 1.67?
No. 1.67 already provides significant thickness reduction for many stronger prescriptions. 1.74 becomes more useful when additional reduction is important and the prescription and frame can benefit.
Can my current thick lenses simply be made thinner?
Finished prescription lenses generally cannot simply be ground thinner while preserving their optical properties. New lenses are normally manufactured when a thinner material or different design is needed.
Does frame size affect high-index lens thickness?
Yes. Frame dimensions, lens shape, PD and optical positioning can significantly influence finished lens thickness.
Ready for High-Index Replacement Lenses?
Choose your replacement lens options and send compatible existing frames — or eligible new frames purchased elsewhere.