Ocushield EMF Radiation Protection for iPhone

The evidence sits much more strongly with sleep than with eye strain. The circadian system is most sensitive to light in the 450 to 480nm range, which is exactly what an iPad emits.

Research has shown that using a light emitting device in the hours before bed suppresses melatonin, delays sleep onset and reduces REM sleep. Chang and colleagues demonstrated this in 2015.

Melatonin does not just make you feel sleepy, it shapes how much time you spend in deep and REM sleep, which is the restorative part.

The Ocushield iPad filter reduces that blue light at the source, which may support more natural melatonin production in the evening.

On digital eye strain alone, the Cochrane review found no significant correlation with blue light - but more studies are being done.

Night Shift shifts colour temperature across a broad range of wavelengths. It is a blunt instrument, it gives you a heavy orange tint, and most people turn it off within a week because everything looks wrong.

The Ocushield filter works on the glass, targeting the wavelengths that matter for melatonin, without that colour shift. Run both if you like. The filter is the one you will actually keep using.

Very slightly, and most people stop noticing within a day or two. The filter maintains high transparency so photos, video and reading all look normal.

My own experience with these on my laptop, desktop and phone is that the difference only becomes obvious when you take it off.

Each listing is matched to specific iPad models. Check yours in Settings, General, About, or on the back of the device.

The physical dimensions are included in every product listing so you can confirm the fit before ordering. If you are between two options, the millimetre measurements will settle it.

Easier than most people expect. The Ocushield iPad filter comes with an installation tray that sits over the top of your device and aligns the filter perfectly, so there is no guesswork and no crooked edges.

Clean the screen first, position the tray, then press the filter down onto the iPad. Use the included tool to work out any air bubbles from the centre towards the edges. Straightforward, and no adhesive to fight with.

No. Scrolling, tapping and Apple Pencil all work normally. This is a common question and thankfully the touch sensitivity is still great.

Yes, and children are arguably who need them most. A child's lens is not fully matured as effectively as an adult lens does. More of that light reaches the retina.

There is also the sleep link. Reasearch is pointing to the eyeball lengthening during the day and recovering overnight. It's suggested that poor sleep reduces that recovery phase, which matters for myopia.

When schools have installed filters on devices, the feedback has been less fatigue through the day and more rested eyes for both staff and children.

If a parent asks me for a suggestion of just one thing to do, it's to put a filter on the device.