Updated October 2026
Shopping blue‑light frames should feel effortless. This guide shows you exactly how to scan an OTRA Product Detail Page, what each spec means for comfortable screen time, and which details matter most when you compare styles across the Blue Light collection in the U.S.
The fast scan: where to look on the page
On each OTRA Product Detail Page, scroll just below the photos to find a compact spec list. For blue‑light styles, focus on four fields: lens category (usually Category 1), UV protection (UV400), and three fit measurements in millimeters and inches—frame width, frame (or lens) height, and nose gap. Those numbers predict how a frame will feel before you try it on. If you’re dialing in size first, see Blue‑light glasses for small, medium and wide faces.
What each blue‑light spec means (and how to use it)
Lens category: Cat.1 for indoor clarity
Category numbers describe visible‑light tint depth. For blue‑light glasses, Category 1 keeps your view bright and natural under office fluorescents, home LEDs, classrooms, and airports—your eyes stay visible on video calls and color shifts remain minimal. For a plain‑language look at what’s filtered, read What blue‑light lenses filter, and what they don't.
UV protection: UV400 on the label
UV400 means protection against UVA and UVB. It’s listed alongside lens category but serves a different job: UV protection is about invisible ultraviolet light; category is about how dark the lens looks and feels.
Frame width (mm/in): the overall feel
Width is your best predictor of comfort across the temples. Match a pair you already love and stay within about ±2–3 mm for a near‑identical feel. A 5–6 mm change is noticeable; 7+ mm is a true size shift. If your day is mostly at a desk, quick balance tips live in All‑Day Desk Comfort: Frame Balance, Nose Pads, and Hotspot Fixes.
Frame (or lens) height (mm/in): presence and coverage
Height influences how bold a frame reads on camera and how much lens area you see through. Taller openings can trim peripheral glare; shorter heights feel airy and minimal. Keep height consistent when you compare styles.
Nose gap (mm/in): stability on your bridge
Small millimeter changes at the bridge make a big difference. If frames slide when you look down, choose a slightly smaller gap; if you prefer an ultra‑light feel, a slightly larger gap can work—so long as the frame doesn’t drift. For low‑bridge shoppers who want extra security, nose‑pad metals can help fine‑tune contact; start with the comfort ideas in All‑Day Desk Comfort.
How to compare OTRA blue‑light frames before buying
- Lock your width first: Use a favorite pair as your baseline and stay within ±2–3 mm.
- Set your stability with the nose gap: A snugger gap reduces midday slip; too tight can pinch.
- Decide your on‑camera vibe with height: Taller reads bolder and covers more; shorter feels light and subtle.
- Consider material and finish: Glossy acetates feel polished; translucent tones soften bolder shapes; fine metals look crisp on webcams.
Want a quick size‑confidence refresher? Skim Blue‑light glasses for small, medium and wide faces.
- Derby Blue Light — Classic square with defined proportions for comparing width and height on your face.
- Maddy - Black — Refined cat-eye that helps you judge how height and shape affect your on‑camera presence.
- Kenny - Black — Slim, low‑profile metal to test narrow bridges and minimal temple slip.
- Nove - Transparent Coffee — Translucent acetate to evaluate softer tones and how they change perceived frame width.
See it on a real Product Detail Page
Open a couple of live pages and practice the scan. For a geometric statement with an indoor‑clear Cat.1 tint, explore the measurements on BLUE LIGHT - Abby. Prefer a refined cat‑eye that suits many medium faces? Check width and nose gap on BLUE LIGHT - Hazel. If you love a classic, camera‑friendly square, compare frame height on BLUE LIGHT - Frankie to see how presence changes on video.
- BLUE LIGHT - Abby — Geometric statement in a Cat.1 indoor‑clear option to check measurements and on‑screen presence.
- BLUE LIGHT - Hazel — Refined cat‑eye offered in Cat.1 to compare width and nose gap for medium faces.
- BLUE LIGHT - Frankie — Camera‑friendly square in Cat.1 to compare frame height and on‑screen presence.
Decision matrix: Blue‑light vs. darker sun tints
Use this table to align lens category to common U.S. light conditions.
| Option | Primary use | Indoors (screens) | Outdoors (bright sun) | Typical tint |
|---|---|---|---|---|
| Blue‑light (Cat.1) | Screen comfort, indoor tasks | Excellent | Limited (too light for strong glare) | Very light, near‑clear |
| Sun lens (Cat.2) | Mixed sun, bright overcast | Too dark for most indoor use | Good | Moderate tint |
| Sun lens (Cat.3) | Strong sun—commutes, beach, high‑glare settings | Not suitable indoors | Excellent | Dark tint |
If you want one pair to bridge laptop days and sunny errands, weigh tradeoffs in Blue‑Light vs. Sunglasses: Can One Pair Do Double Duty?. When you’re ready to explore darker tints, browse a few sun‑forward silhouettes—try a crisp fade like Kori Black/Smoke Fade or a confident classic like Stevie Black/Smoke.
- Kori- Black/Smoke Fade — Fade sunglass option ideal for bright outdoor light while complementing indoor blue‑light pairs.
- Stevie - Black — Solid dark tint sunglass that pairs with blue‑light frames for strong sun protection.
- Alba - Dark Tortoiseshell — Darker tortoise sunglass that provides stronger outdoor glare protection and classic styling.
- Nia - Dark Chocolate — Deep chocolate tint for high‑glare outdoor use that balances with indoor blue‑light pairs.
Glare, webcams, and color on screens
Ring lights and bright windows can reflect in any lens. Place lights about 45° off‑axis and tilt your screen slightly. Any tint can nudge perceived color; if your work is color‑critical, preview at your usual desk lighting and compare scenarios in What blue‑light lenses filter, and what they don't.
Care & cleaning
Keep lenses clear with a microfiber routine and skip paper towels and shirt hems. For a quick, streak‑free habit at your keyboard, follow Best Way to Clean Blue Light Glasses.
FAQs
- Are blue‑light lenses the same as sunglasses? No. Blue‑light frames are typically Cat.1 for indoor clarity; sunglasses use darker Cat.2/Cat.3 tints for outdoor glare. See Blue‑Light vs. Sunglasses for scenarios.
- Will blue‑light lenses change how my screen colors look? Slightly. Cat.1 is designed to look near‑clear, but any tint can shift perception. If color accuracy matters, preview at your normal workspace lighting and skim What blue‑light lenses filter, and what they don't.
- How do I pick a size if I’m between widths? Start with the width of a pair you already love and stay within ±2–3 mm. If you’re unsure which direction to go, use face‑size tips in Blue‑light glasses for small, medium and wide faces.
Next steps
Shortlist two or three frames that match your width and nose‑gap preferences, then preview them in good, even light. From there, choose a comfort priority—stability, balance, or all‑day desk feel—and read a focused piece like All‑Day Desk Comfort. Keep your lenses spotless with the simple routine in Best Way to Clean Blue Light Glasses.
