FRAME SIZE (MM) 51 20 36 141 Frame size: Small · View Size Guide
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Try Frame on Your FaceCorvin Essential Rimless Eyeglasses bring together minimalist styling, refined detailing and prescription-ready functionality for wearers who prefer an understated eyewear look. The rimless construction keeps the visual profile clean, while the Espresso Brown finish adds a warm and sophisticated touch.
Designed without a conventional frame surrounding the lenses, Corvin creates a subtle appearance that allows your eyes and facial features to remain the natural focus. Its versatile styling makes it suitable for professional environments, formal occasions and everyday prescription eyewear.
Rimless eyewear requires mounting points to be precisely drilled into the lenses. Nations Optics uses polycarbonate lenses for rimless eyewear because they are designed to provide greater impact resistance and are suitable for precision drilling compared with conventional lens materials. :contentReference[oaicite:1]{index=1}
The Corvin Essential design is made for people who appreciate simplicity without sacrificing sophistication. Its rimless construction creates a clean visual effect, while the Espresso Brown finish introduces a refined warmth that pairs easily with both formal and casual wardrobes.
Unlike bold full-rim frames, the minimal construction keeps attention naturally around the eyes. This makes Corvin an excellent choice for professionals, students and everyday eyewear users who prefer an elegant and discreet optical style.
The streamlined rimless structure gives Corvin a visually lightweight character. Adjustable nose pads help position the eyewear according to individual fitting requirements, while the simple construction complements extended everyday use.
Because rimless lenses are mounted through precision-drilled points, appropriate lens selection and professional fitting are important. Polycarbonate is used for Nations Optics rimless eyewear to support the drilling and mounting requirements of this construction. :contentReference[oaicite:2]{index=2}
Nations Optics combines contemporary eyewear styling with practical prescription compatibility. Each eyewear design is selected with attention to appearance, usability and everyday comfort.
Prescription lenses can be personalized according to individual vision requirements, including suitable single-vision, bifocal and progressive options. For rimless eyewear, the lens shape and mounting requirements are considered during the fitting process.
| Color | Brown |
|---|---|
| Glasses Size | Medium |
| Eyewear Type | Rimless |
| Eyewear Shape | Rectangular |
| Front Rim Material | Carbon Fiber |
| Temple Material | Acetate |
| Size In MM | 51-20-36-141 Size Guide |
| Est. Wt. Grams(incl. Glasses) | 19.56 |
Rimless frames require holes drilled directly into the lens to attach the frame. Regular lenses can easily crack or shatter at these drill points, which could be unsafe for your eyes.
Polycarbonate lenses are 10x more impact resistant than standard lenses — they won't crack during drilling or from accidental drops. They're virtually unbreakable and lightweight.
We use them for rimless frames purely for your safety and lens longevity — so you never have to worry about cracked or broken lenses.
Frame quality
Every frame listed on our website passes a thorough quality check before it goes live. We inspect, measure, and verify each model — so the specs you see on the product page are exactly the specs you receive.
What we check on every frame
Hinges are tested for flex strength and snap-back precision. Only frames meeting minimum flex cycle standards are listed.
Flex testedNose pads are checked for material finish, grip texture, and secure attachment — ensuring all-day comfort without slipping.
Comfort verifiedMetal frames are verified for alloy grade, finish uniformity, and resistance to corrosion and bending under normal use.
Grade verifiedSheet frames are inspected for surface clarity, colour consistency, and resistance to warping or surface cracking.
Material inspectedLens width, bridge width, and temple length are physically measured in mm and verified against the product page listing.
mm accurateEach frame's weight is measured on a precision scale and listed on the product page — so you know exactly what to expect.
Gram accurateIf you receive a frame that does not match the listed specifications — in material, size, or weight — we will replace it or refund you in full within 10 days of delivery. No arguments, no hassle.
Frequently asked
Rimless eyewear
Yes — and it is easier than you think. Nations Optics offers a free custom lens shape selector on every polycarbonate lens product page, built specifically for rimless frame wearers.
Rimless frames require holes to be drilled directly into the lens to hold the frame in place. Standard lens materials can crack or shatter at these drill points — which is why Nations Optics exclusively uses polycarbonate lenses for all rimless frames. Polycarbonate is 10x more impact resistant than regular lenses, virtually unbreakable, and handles precision drilling without weakening — keeping your eyes safe and your lenses lasting longer.
When you order a polycarbonate lens on any product page, you will see a "Choose Lens Shape" button. Select the shape that matches your rimless frame — Aviator, Butterfly, Rectangular, Oval, Square, and more — and our team will precision-cut your lenses to fit that exact shape. If your order also includes a rimless frame from our collection, the same shape is automatically applied and fitted for you.
Why polycarbonate only
Rimless frames require drilling directly into the lens. Only polycarbonate can handle this without cracking — keeping your lenses safe and durable.
Where to find it
On every polycarbonate lens product page, tap "+ Choose Lens Shape" before adding to cart. Pick your shape and we handle the rest.
No extra charge
Custom lens shape cutting is included at no additional cost. The price you see is the price you pay — shape selection is completely free.
Select your shape on the product page. If your order includes a rimless frame, the same shape is precision-cut and fitted directly into your frame before dispatch — all included in your order price.