Thin Lenses for Strong Prescriptions: What You Are Actually Paying For
5 October 2026
12:20
On average, every person in the UK now spends more than six hours every day looking at a digital screen. You might finish a long shift at the office only to spend your evening scrolling through a smartphone or watching television. By the time you head to bed, your eyes feel gritty and strained.
This common discomfort has led to a massive surge in the popularity of blue light glasses. Many people claim these spectacles are an essential tool for the modern world, while others dismiss them as another marketing trend.
At Mosspark Opticians, patients often ask us: What are blue light glasses, and can they actually help? In this post, we will discuss the facts behind the technology and show you if these lenses actually provide the relief you need.
For most people, blue light glasses probably don’t do what they’re sold to do. The best current evidence suggests they make little or no difference to eye strain from screens, their effect on sleep is unclear, and there’s no evidence they protect your eyes from disease. They aren’t harmful, but there are better ways to help tired eyes.
Blue light is simply part of the visible light we see every day. By far the biggest source is the sun. Screens, LED bulbs and fluorescent lights give off blue light too, but in tiny amounts by comparison. Even a full day at a computer exposes you to far less blue light than a short walk outside.
Blue light during the day is useful. It helps keep you alert and sets your body clock. It is not the same as ultraviolet (UV) light, which you can’t see and which does damage eyes. That’s a job for sunglasses with proper UV protection.
Blue light glasses have lenses that filter out part of the blue light passing through them. They do this with either a coating on the lens surface, which reflects some blue light away, or a slight yellow tint in the lens, which absorbs it. Either can be added to prescription or non-prescription lenses.
They’re often confused with anti-reflection coatings, which are a different thing. An anti-reflection coating cuts reflections on the lens itself. Many blue light lenses include one, and that’s often what people notice.
In 2023, a Cochrane review, the most rigorous kind of evidence summary, pulled together 17 clinical trials on blue light filtering lenses. The College of Optometrists in the UK takes the same view as its findings.
The claim | What the evidence shows |
They reduce eye strain from screens | Probably little or no difference compared with ordinary lenses |
They help you sleep | Unclear. Studies give mixed results |
They protect against eye disease | No evidence. No trial has shown any effect on the health of the retina |
They are harmful | No. Side effects in trials were mild and uncommon |
The trials were mostly small and short, so the picture may change as better research is done. But as things stand, there isn’t good evidence to recommend blue light glasses to the general population.
There’s no good evidence that blue light from screens damages the retina or causes conditions such as macular degeneration. The amount of light is simply too small.
The tired, burnt-out feeling after a long day at a screen is real, but it comes from how we use screens, not from the light they give off.
No lens can replace your eyes’ need to rest, blink and refocus. Long, unbroken screen sessions will tire your eyes whatever you’re wearing. Here’s more on screen time and your eyes.
If your eyes ache, sting or blur after screen work, one or more of these is usually responsible:
If you get regular headaches with screen work, it’s worth reading headaches and your eyes.
Bright light in the evening, including light from screens, can delay the release of melatonin, the hormone that helps you feel sleepy. That part is well established. What’s less clear is whether blue light glasses solve it. The trials so far give mixed results, and it’s hard to separate the effect of the light from the effect of what you’re doing on the screen. Scrolling in bed keeps your brain alert, whatever colour the light is.
These habits are more dependable:
If you already have them and find them comfortable, there’s no reason to stop wearing them. They won’t do any harm. And if you’d like a blue light filter on your next pair of lenses, we can add one.
But I wouldn’t want you to pay for one expecting it to protect your eyes or cure eye strain, because the evidence doesn’t support that. If your eyes are uncomfortable, the better investment is finding out why.
Book an eye test if your eyes are tired or sore most days, if you get regular headaches, if your vision blurs when you look up from a screen, or if it’s been more than two years since your last test. In a 45-minute eye examination, I check your prescription, how your eyes focus and work together, and the surface of your eyes. If dryness is the cause, we can assess and treat it in our dry eye clinic.
To book an eye test, call Mosspark Opticians on 0141 427 4040, or visit us at 115 Airth Drive, Bellahouston, Glasgow G52 1JU. NHS eye tests are free in Scotland.
For most people, the evidence says probably not. A 2023 Cochrane review of 17 trials found that blue light filtering lenses probably make little or no difference to eye strain from computer use, and that their effect on sleep is unclear. They are not harmful, and some people find them comfortable.
The research is unclear. Bright light in the evening can make it harder to fall asleep, but trials have not shown reliably that blue light glasses fix this. Dimming your screen, using night mode and putting devices away before bed are more dependable.
Usually because you blink less when you concentrate, so your eyes dry out, and because your focusing muscles work hard for long periods. A slightly out-of-date prescription, glare and a badly positioned screen all add to it. It is not caused by blue light.
There is no evidence that children need them. What does help children’s eyes is regular breaks from close work, time outdoors every day and a yearly eye test, which is free in Scotland.
No. An anti-reflection coating cuts reflections on the surface of your lenses, which makes screens and night driving more comfortable. A blue light filter blocks part of the blue light passing through the lens. Some lenses have both.
Independent Optician – Mosspark Opticians, Glasgow
Rahillah is a fully qualified optician with nearly 20 years of experience providing professional eye care in Glasgow. As the owner of Mosspark Opticians, she specialises in comprehensive eye examinations, prescription glasses, children’s eyewear, and personalised optical solutions. Known for a patient-focused approach, Rahillah is committed to clear communication, clinical excellence, and long-term eye health for patients of all ages.
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