The blue-light-glasses category is mostly marketing. Most of the daytime "computer glasses" sold to office workers have a barely tinted lens that blocks a handful of wavelengths and nothing else. They might reduce eye strain a little. They do close to nothing for sleep.
The category that actually has science behind it is the evening one. And the science is sharper than people realise.
What the eye is actually responding to
In the early 2000s, researchers identified a third type of retinal photoreceptor, separate from rods and cones. Intrinsically photosensitive retinal ganglion cells, or ipRGCs. They contain a pigment called melanopsin and they signal directly to the suprachiasmatic nucleus, the brain's master clock. Their peak sensitivity is roughly 480 nanometres. Blue.
Light in the 460-490nm range is what your circadian system reads as "morning, awake, alert." When you get that light at 11pm from a phone or an overhead LED, your brain delays melatonin. You feel less sleepy. You stay up later. You sleep less deeply.
This is the actual mechanism evening lenses interrupt.
Yellow, orange, red
Three tints, three different jobs.
Yellow lenses cut a small portion of blue. Useful for screen-heavy daytime work to reduce eye strain. Minimal effect on melatonin because they do not block enough of the active range.
Orange lenses cut about 98% of light below 500nm. This is the sweet spot for evening wear. You can still work, watch TV, talk to people normally because colour perception is largely intact. Melatonin is meaningfully protected. The ÖRUS Orange Lens Glasses sit here.
Red lenses block close to 100% of blue and green, down to about 570nm. This is the maximum-effect tier for the last hour or two before bed. The world goes warm and orange-tinted. The ÖRUS Red Lens Glasses are designed for this. They are too restrictive for an entire evening of normal life, but for the wind-down hours they are the most effective lens you can wear.
The research, briefly
Burkhart and Phelps in 2009 ran one of the cleanest early studies. Twenty insomniacs wore amber-tinted glasses for three hours before bed for two weeks. Sleep quality improved measurably compared to a yellow control lens. The effect size was on par with cognitive behavioural therapy for insomnia, which is the gold standard non-drug intervention.
Subsequent studies have replicated this in shift workers, people with bipolar disorder, and otherwise healthy adults exposed to bright evening screens. The pattern is consistent. Block short wavelengths in the evening, sleep starts faster, sleep gets deeper.
What to do
For evening use, the choice is between orange and red. Orange for general evening, red for the final stretch. If you only buy one, orange covers more situations. If you can layer them, switch from orange to red around 90 minutes before bed.
The daytime category is almost entirely separate. If you spend ten hours a day on a screen, lenses might help eye strain. They are not a sleep intervention.
What this is not
These are not medical devices. They will not fix sleep apnoea, severe insomnia, or a 3am-screen habit. They are one input. Stacking them with consistent bedtime, dim room lighting, and a cool dark bedroom is what produces the effect.
Used in isolation, against a backdrop of bright overhead lights and a 1am phone scroll, they do not do much. Used as part of a real wind-down, they do exactly what the research says.
