Lightweight unisex rounded-rectangle eyewear featuring a durable TR90 full-rim front and flexible memory metal flexon temples. Air-light at 13.65 g, this medium frame fits all prescription lens types comfortably.
FRAME SIZE (MM) 51 24 40 140Discover everyday comfort with the NationsOptics rounded rectangle full-rim TR90 frame, designed for unisex wear and reliable performance. Crafted from durable TR90 material, this eyewear offers excellent flexibility and strength while maintaining an air-light feel for long hours of use.
Featuring a rounded rectangle shape, the frame delivers a balanced and versatile appearance suitable for various face types. With memory metal flexon temples, the eyewear adapts smoothly to movement, ensuring a secure and pressure-free fit. Weighing just 13.65 grams, the medium size design supports comfortable daily wear.
These TR90 full-rim frames support a wide range of prescription lens options, including:
The NationsOptics Rounded Rectangle TR90 Full-Rim Frame combines lightweight comfort, flexible support, and versatile lens compatibility — making it an ideal choice for everyday unisex eyewear needs.
| Glasses Size | Medium |
|---|---|
| Eyewear Type | Full Rim |
| Eyewear Shape | Rounded Rectangle |
| Front Rim Material | TR-90 |
| Temple Material | Memory Metal Flexon |
| Size In MM | 51-24-40-140 Size Guide |
| Est. Wt. Grams(excl. Glasses) | 13.65 |
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.