De Wetenschap
The science
What a screen actually emits
Most of what gets said about blue light is either frightening or vague. This page is neither. It explains what is measurable, what we measured, and what we deliberately do not claim.
If you work on screens, you spend more of your waking life a foot away from a light source than any generation before you. That light is not mysterious. It is a spectrum, it has a shape, and it can be measured with an instrument rather than argued about.
380450500550600650700 NM
The visible spectrum, with the band SIGHTSS targets cut out of it. Everything outside that band passes through. That is the entire product in one picture — and it is also why your screen does not turn yellow.
High-energy visible light, plainly
Every backlit display emits high-energy visible light — HEV. It is the short-wavelength end of what your eyes can see, roughly 400 to 500 nanometres, and it is the most energetic light a screen sends you. OLED panels emit it with a pronounced peak in the low 450s, which is exactly where the band above sits.
That is a statement about what a panel puts out. It is not a statement about what it does to you, and you will not find one on this page.
Why Night Shift is not filtering anything
Night Shift, Dark Mode and everything like them do one specific thing: they change what your device renders. They shift the colour temperature of the image in software. That is why everything turns amber, and why photo or design work becomes impossible with them switched on.
The panel is still emitting the same spectrum. The software has only chosen warmer colours to draw with. It is also a setting — something to remember, something you switch off the moment you need accurate colour, and something that does nothing for anyone else looking at your screen.
A filter in the glass is not a setting. It is physically in front of the panel, and it is there whether you remember it or not.
What SIGHTSS does
400–470 nm
Up to 57% of HEV light in that range is filtered at the surface of the glass, before it leaves the screen.
No yellow cast
The filtering is spectrally targeted rather than a blanket warm tint, so whites stay white and your photos still look like your photos.
In the glass
Not a coating sprayed on top and not a film you add. It is part of the tempered glass, so it cannot wear off or peel.
Getting the second of those three right is the reason this product exists. Nearly every blue light protector we tested first turned the screen yellow — which solves the measurement and ruins the screen. A filter you take off again is not a filter.
How it was measured
The figure comes from spectrometer-based testing across the 400–470 nm range, carried out independently rather than taken from a supplier's brochure. We will send the report to anyone who asks — email support@sightss.com and you will get it.
Separately, the product was tested and approved by an optometrist. That visit is not a badge we bought afterwards; it is where the product started. The idea of filtering a precise band rather than everything came out of that conversation.
OptometristTested and approved by an optometrist.
Lab testedIndependently lab tested. Report available on request.
One minuteAlignment frame, alcohol wipe, microfibre cloth and dust sticker in the box.
100 nightsA hundred nights to try — even once the glass is applied.
What we do not claim
This category has a habit of promising things it cannot show you. We would rather tell you where the line is.
Three things you will never read here
- A round number like 99%. Our figure is up to 57% in a named range, because that is what the instrument returned. A percentage without a wavelength range attached does not mean anything.
- Anything medical. We do not claim this prevents, treats or protects against any condition. It is a filter in a piece of glass, and we talk about comfort, not health.
- That you will feel it immediately. You will not notice it on day one. People tend to notice it after a week, usually as the absence of something rather than the presence of anything.
Compared with what you have tried
| Night Shift / Dark Mode | Blue light glasses | SIGHTSS | |
|---|---|---|---|
| Filters anything | No — software colour shift | Yes, at your eyes | Yes, at the screen |
| Colour stays accurate | No — warm cast | Depends on the lens tint | Yes |
| Works without remembering | No — it is a setting | No — you have to wear them | Yes |
| Works for anyone looking at the screen | Yes | No | Yes |
| Something on your face | No | Yes | No |
| Also protects the screen | No | No | Yes |
Fits iPhone 18 Pro and iPhone 18 Pro Max. iPad and MacBook protectors return to stock this quarter. Earlier iPhone models are sold out — join the waitlist on the product page.
Where exactly does the 57% come from?
Independent, spectrometer-based lab testing across the 400–470 nm range. It is an upper figure within that band, not an average across the whole visible spectrum. Email support@sightss.com and we will send the report.
Will my screen look yellow or dimmer?
No. The filtering is targeted at a narrow band rather than applied as an overall warm tint, so whites stay white and colours stay where they should be. This is the part that took longest to get right.
Can I use it together with Night Shift?
Yes. They are independent of each other — one is software, one is glass. Most people find they stop reaching for Night Shift.
Is this a medical product?
No, and we do not present it as one. It is a tempered glass screen protector with a filter built into it. If you have a specific concern about your eyes, that is a conversation for an optometrist, not for a shop.
Does Face ID still work?
Yes. The cutout is machined to the sensor array, and the glass does not interfere with the infrared dot projector.
What if I don't get on with it?
100 nights to try, even if the glass is already applied. The alignment frame in the box makes sure it goes on straight the first time.
Measured, not promised
SIGHTSS for iPhone 18 Pro and iPhone 18 Pro Max.
Shop SIGHTSS Working in shared spaces? SIGHTSS + Privacy adds a 60-degree privacy filter to the same glass.