Comparing 1.67 vs 1.74 High-Index Lenses in Rimless Glasses: A Real Custom Case Study
When it comes to rimless titanium glasses, every millimeter matters—especially for wearers with high prescriptions.
In this detailed comparison, we’ll explore how lens index, frame geometry, and size impact final thickness and weight, using two of our premium Japanese titanium models as real-world examples.
🕶️ Product Introductions
A: Model EO-6773 – Japanese Titanium Designer Rimless Glasses
🔗 Japanese Titanium Rimless Glasses
Specifications:
- Weight (with demo lenses): approx. 14g
- Lens width: 50mm | Lens height: 43mm
- Bridge width: 18mm | Frame width: 135mm
- Temple length: 148mm
Design Overview:
This model embodies modern Japanese minimalism. The geometric lens shape adds balance and sophistication, while the ultra-light pure titanium temples ensure strength and flexibility. It’s a favorite among those seeking lightweight designer rimless glasses that combine both precision and elegance.
B: Model EO-6415 – Japanese Floral-Inspired Rimless Glasses
🔗 Japanese Floral Engraved Rimless Glasses
Specifications:
- Weight (with demo lenses): approx. 16g
- Lens width: 53mm | Lens height: 40mm
- Bridge width: 18mm | Frame width: 135mm
- Temple length: 148mm
Design Overview:
The EO-6415 model brings a touch of oriental grace to rimless eyewear. The floral temple engraving highlights traditional craftsmanship, making this one of our most elegant rimless glasses for women. Its subtle feminine design offers timeless beauty with modern comfort.
🔧 Lens Processing & Prescription Details
A: Model 6773 – Japanese Titanium Rimless Frame
Lens Used: 1.74 High-Definition Coated Lenses
- Right Eye (OD): -8.50
-
Left Eye (OS): -8.25
Processing:
The lenses were crafted to the frame’s original 50mm width and 43mm height, with gentle edge polishing for a seamless rimless finish.
Final Weight: 19.2g (including lenses)
Despite the higher refractive index, the final result is ultra-light thanks to titanium’s minimal density and expert cutting precision.
B: Model 6415 – Japanese Floral Rimless Glasses
Lens Used: ZEISS SmartLife 1.67 Single Vision Lenses
- Right Eye (OD): -8.50, Cylinder -1.75
-
Left Eye (OS): -8.50, Cylinder -2.25
Processing:
The lens width was reduced slightly—from 53mm to 52mm—for better proportion and to reduce visible edge thickness. Edge polishing completed the clean, optical-grade finish.
Final Weight: 20.8g (including lenses)
Special Note:
Even though the ZEISS 1.67 lenses are slightly thicker at the edges, their advanced optical material keeps the total weight impressively low. This is a testament to ZEISS engineering—premium materials that deliver both clarity and lightness.
🔍 Comparing Lens Thickness
This is where lens index and shape make all the difference.
Lens Shape & Geometry
Model 6773 – Polygonal Semi-Round Lens
The curved edges of this polygonal shape help minimize corner thickness, distributing the lens edge more evenly. This results in a smoother and thinner visual effect even for high prescriptions.
Model 6415 – Angular Square Lens
This lens has wider top corners and more rectangular geometry. Because square lenses extend closer to the outer edge of the circular lens blank, they tend to retain more of the thicker periphery.
Explanation:
All myopia (nearsighted) lenses are thinner in the center and thicker at the edges.
When a lens shape pushes further toward the outer perimeter of the lens blank—as with a rectangular design—the edge naturally becomes thicker.
📊 Side-by-Side Results: 1.74 vs 1.67
| Feature | Model 6773 (1.74 Lenses) | Model 6415 (1.67 Lenses) |
|---|---|---|
| Prescription | -8.50 / -8.25 | -8.50 / -8.50 (-1.75/-2.25 cyl) |
| Lens Shape | Polygonal Semi-Round | Square Angular |
| Refractive Index | 1.74 | 1.67 |
| Final Weight | 19.2g | 20.8g |
| Visual Thickness | Thinner | Slightly Thicker |
| Comfort | Ultra-light, balanced | Slightly heavier, equally refined |
Even though the EO-6415 frame uses ZEISS’s high-quality SmartLife 1.67 lenses, the 1.74 lenses on the EO-6773 model clearly produce a slimmer edge profile. This effect is further enhanced by the rounded lens shape, which helps reduce visible thickness in the corners.
🧭 Key Takeaways
This real-world test perfectly illustrates the three main factors that determine lens thickness and comfort in rimless prescription glasses:
- Prescription Strength – Higher myopia equals thicker edges.
- Lens Refractive Index – Higher index (like 1.74) means thinner lenses.
- Lens Shape & Size – Rounded or smaller shapes help minimize thickness.
The beauty of custom rimless eyewear is flexibility: you can tailor the lens shape, size, and even edge finish to match your optical needs and aesthetic preferences.
💬 Final Thoughts
Both the Japanese Titanium Rimless Glasses and the Floral Engraved Rimless Titanium Glasses showcase what modern optical design can achieve—lightweight strength, precise craftsmanship, and visual beauty.
Even for high prescriptions above –8.00, you can enjoy elegant designer rimless glasses that stay slim, comfortable, and perfectly balanced.
If you’re exploring your own high-index customization, browse our Rimless Glasses Collection or contact us to discuss size and shape adjustments for your perfect fit.
