EMR-TEK NYX Blue Light Blocking Glasses
by EMR-TEK
Acetate frame with a red sleep lens that passes under 2% of light from 400 to 570 nm in the maker's lens report. Orange lens and progressives offered.
Specs
| Lens tint | Red (dark orange also sold) |
|---|---|
| Published blocking | Red: 1.1% avg 380 to 500 nm, under 2% to 570 nm (maker report) |
| Melanopic cut (independent lab) | Not tested |
| Over glasses | No |
| Prescription | Single vision, progressive or bifocal |
| Light let through | Red 17%, orange 53% (maker report) |
| Orange lens | 0.6% avg 380 to 500 nm, 6.9% at 530 nm (maker report) |
| Lens size | 54 × 41.6 mm, bridge 16, temple 145 |
| Frame | Acetate with steel core |
| Warranty | 1 year, 30-day returns |
Specs from the manufacturer and the sources listed below. Last verified Oct 21, 2026.
Good
- Maker's red-lens report shows under 2% transmission at every 10 nm step from 400 to 570 nm
- Reports give full numeric tables for both the red and orange tints, not just a graph
- Single vision, progressive and both bifocal styles offered in every tint
- Larger lenses than EMR-TEK's Freya frame (54 vs 49 mm wide)
Not so good
- No independent measurement; the lens reports were published by EMR-TEK and the PDFs do not name a lab
- The red lens passes only about 17% of visible light, so rooms look dark
- Front-only frame lets side light in
- Prices on the page text ($109.99 plain, $219.99 prescription) do not match the checkout options ($99.99 and $249.99)
The NYX is a mid-size acetate frame sold with four lens tints. For sleep, the red and orange tints are the ones that matter, and EMR-TEK posts a transmission report for each with readings every 10 nm.
The red lens report is one of the deepest curves on this page. Transmission stays under 2% at every step from 400 to 570 nm, peaking at 1.7% at 430 nm, then climbs to 7% at 580 nm and 56% at 600 nm. That cuts further into green than the Bon Charge Morris, whose maker curve opens at about 555 nm. The cost is brightness: the red lens passes only about 17% of visible light.
The orange lens report looks close to the Sleep Swannies lens: 0.6% on average from 380 to 500 nm, 6.9% at 530 nm and 20% at 540 nm, with about 53% of visible light let through. Pick orange if you want to read or cook in it, red for the last hour before bed.
These are maker numbers. EMR-TEK says a lab called Micro-Light Optics ran the tests, but the PDFs themselves name no lab, and no EMR-TEK glasses were among the 26 models in the 2025 independent analysis. That keeps it below the measured Swannies and Uvex Skyper.
Options are broad. Every tint comes in single vision, progressive or flat-top and round-top bifocal, plus +1.25 and +2.00 readers. The plain pair is $99.99 on sale (regular $149.99), and prescription versions ran $249.99 to $299.99 at checkout. Don’t drive in either night tint; EMR-TEK itself warns that the red lens hides green traffic lights.
Sources
Alternatives
- Best overallSwanwick Sleep Swannies Classic$130
- Best budgetUvex Skyper SCT-Orange (S1933X)$16
- Best fit-overSwanwick Sleep Swannies Fitover$160
- Best red lensBon Charge Morris Blue Light Blocking Glasses$130