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Black semi-rimless computer glasses with blue light filter 490

Corn Electronics

Corn Electronics YJ-4 Blue Light Filter 490 Semi-Rimless Computer Glasses Black

SKU CH-03GD-8EFSE

Blue-light filtering semi-rimless glasses tested to block at the 490 level, reducing eye strain and UV exposure from screens

  • Frame ColorBlack
  • Blocks blue light at 490 tester level for reduced eye strain
  • Shields against UV and electromagnetic radiation from screens
  • Helps prevent headaches and sleep disruption caused by blue light
  • Semi-rimless unisex design suits both men and women
  • Professional blue-ray testing confirms effective light filtration

Blue Light Filter at 490 Level

These computer glasses use a tested blue light filter rated at 490 on the professional blue ray tester scale. At this level the lens prevents blue light from penetrating, unlike a 0 level where it passes through. The semi-rimless black frame suits both men and women for daily screen use.

Office Workers and Evening Screen Users

People who spend long hours at a monitor and notice eye fatigue, headaches or disrupted sleep will benefit from the UV and electromagnetic radiation blocking. Buyers who need prescription lenses or a full-rim frame for impact protection should look at a different style.

Sustained Screen Sessions

During extended work or gaming periods the lenses maintain their filtering performance without degradation. The coating continues to cut blue UV rays across the session, helping reduce the soreness and sleep issues that build up over shorter bursts.

Highlights

  • Blocks blue light at 490 tester level for reduced eye strain
  • Shields against UV and electromagnetic radiation from screens
  • Helps prevent headaches and sleep disruption caused by blue light
  • Semi-rimless unisex design suits both men and women
  • Professional blue-ray testing confirms effective light filtration

Specifications

BrandCORN
Frame ColorBlack

Questions about this item

Do these glasses require a prescription or can they be worn over my existing glasses?

The YJ-4 is a non-prescription computer glass with a semi-rimless frame; it is not designed to fit over prescription eyewear.

Will the black semi-rimless frame obstruct my view when using a large curved monitor?

The semi-rimless design minimises frame presence in the peripheral field, so it should not interfere with a large curved display.

How can I verify the 490 blue-light blocking level is active after I start wearing them?

The supplier states the lenses were tested at the 490 level on a professional blue-ray tester, meaning blue light cannot penetrate the lens.

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