After contacting T’aime to obtain spectral transmission data for the post on best blue blockers they offered to send me their Dinodon computer glasses for review. According to T’aime, the lenses on Dinodon’s filter 97% of blue light. Below you will find my thoughts after wearing the glasses for 4 weeks and the follow-up after another 8 weeks later. The focus of this review is on the lens effectiveness in blocking blue light and glare from computer (digital) screens and their ability to reduce computer eye strain and/or insomnia.
T’aime Dinodon lenses
T’aime offers three different lenses in terms of their spectral transmission properties. They are the 85%, 95% and 97% blue blocking glasses (they don’t specify over what range of wavelengths the blue light filtering rate is calculated).
I’ve tested the Dinodons that have the 97% blue light filtering lenses. Hence in terms of optical properties, this review is also valid for their other glasses with the 97% lens, namely Alye, Apexie, Ebony, Fliger, and Plumer glasses. The 97% lens is also built into LightMag clip-ons.
Transmission: If you are considering blue blockers, their spectral transmission data should be the first thing you want to check. This is because different lenses even when appearing to have the same tint (yellow, amber, or orange) may have considerably different blue light blocking properties.
T’aime doesn’t make the spectrograms for their glasses available on their website, but they’ve been able to provide data on how their glasses change spectral power distribution (SPD) emitted by computer screen.
Below you can see a reading of SPD of a white screen (the “before” image):
You may see a very high spike in the blue wavelength range peaking at 445nm.
Note that most LED back-lit screens tend to have a similar blue peak somewhere in the ~440 – ~460nm range. The intensity of blue light emitted may vary depending on the color displayed (most intense with blue and white) but it is never zero (0) even when displaying red or black. You may find data on various digital device screens on LEDMuseum or fluxometer.com).
Next you may see the “after” image; It is a reading of the same screen but with the 97% blue blocking lens in front of the spectrometer. (The glasses in the image are not Dinodon’s but Fliger’s which use the same, 97% blue light filtering, lens).
You can see that the Dinodon lens blocks close to 100% of blue light up to about 460nm. Thus it eliminates all or most of the big blue spike. (It is a bit difficult to see blue on black background of the spectrometer’s display. That is mostly because blue light transmission is close to zero :).
Dinodon’s spectral transmission and computer eye strain
Judging by their spectral transmission these glasses look promising in terms of their positive effect on computer eye strain because they block near 100% of blue light in the range where digital screens (and other energy saving light sources) emit it most intensly. This is also the range that is critical for blue light induced computer eye strain.
Dinondon’s spectral transmission and insomnia
In terms of helping you sleep better, the Dinodon’s might work for you if you don’t have severe issues with blue light induced insomnia. That is because insomnia inducing blue light sensitivity peaks at ~480nm and approaches 0 only after ~550nm. So with a T’aime 97% blue light blocking lens you’d still be getting into your eyes quite a bit of light in this range.
Anti Reflective (AR) coating: Yes
Prescription: These lenses have no power add. T’aime does not offer prescription (Rx) blue blockers.
After 4 weeks of testing
In general I was very happy with T’aime blue blockers. Specifically:
- I was surprised to see how much blue light is still emitted by my black background screen with f.lux running at 2700K, its highest blue light reduction daytime setting – now, with the blue blockers black is finaly truly black
- subsequently, the contrast between the black background and orange text I normally use is improved
- also, taking the blue light out makes for a clearer image – the characters apear a lot sharper
- the AR coating turned out very important for me (I had tried wearing my Uvex SCT Orange glasses (commission link) for computer work, but gave them up because they still caused eye strain and dry eyes.
- Dinodon’s are lightweight
- they don’t fog up! The lenses on T’aime Dinodon are relatively small, which allows air to circulate between my face and the lenses. This is a big issue for me and another one that previously kept me from using my Uvex blue blockers for computer work, where I need them most – note that I normaly cycle at work 🙂
- I’ve even been able to work in a room with daylight and black text on white background! (with f.lux at 2700K) without noticing the terrible computer eye strain symptoms I’d had before in such an environment. Still, if I can’t do it for too long or the symptoms come back – particularly dry eyes
- I’ve also noted the symptom of dry eyes has been diminishing in intensity since I’ve been wearing these blue blockers (as long as I use them in optimal computer lighting conditions)
A couple of negatives:
- when I work in a room with natural lighting (windows) or under regular overhead office lighting I can see a slight blue-violet reflection in the lens. I suspect this has to do with one of the coatings (AR?) that is applied to the lens and reflects blue light. This may, in some circumstances, defeat the purpose of blue blockers (as shown in this video). However, the blue/violet reflection disappears if I put my hands around the lenses, wear a wide-brimmed hat or when I work in my usual glare and reflection free office
- slightly longer temples would make them even more comfortable for me (maybe my ears are too far back from my eyes 🙂 ) – you might not have the same issue, but you might want to check the dimensions specified on the T’aime website.
In summary T’aime Dinodons improved my visual comfort of screen-based work so 8 weeks ago I decided to continue using them.
After 12 weeks of testing
After three months of wearing T’aime Dinodon 97% blue blocking glasses my opinion remains very positive. The effect T’aime Dinodon’s have had has been extremely positive for my eye comfort.
During this time I was able to extend computer screen viewing time by about 20% without worsening computer vision syndrome symptoms.
Simultaneously I’ve also been able to extend the time between eye-relaxation breaks without noticing any adverse effects. (Without the glasses I’d been doing short, 20 second, breaks every 10 minutes – now I am fine with one every half hour).
If you are suffering from computer eye strain symptoms, T’aime 97% blue light filtering glasses are an excellent option for you.
In terms of preventing blue light induced insomnia you could do better because they don’t filter a high proportion of blue light beyond 460nm.
Also, the lenses are relatively small and sit quite far from the face hence they don’t filter all of the light that enters your eyes. Given the design of our eye this is not a problem for computer eye strain but it might be for insomnia. The corresponding photoreceptors can detect all light entering your eyes, also from the areas not covered by the lens).
Today I am switching to SPEKTRUM Elite glasses for testing purposes. I’ll post a review with my first impressions shortly.
Ps: If you found this review of T’aime blue blocking glasses useful, please consider LIKING, REBLOGGING, and/or SHARING it.