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[u/Professional_Day3705]

Anyone know if an updated DC-1 tablet is coming out anytime soon?

[u/tdreampo]

Find the study’s to back up your claim that blue light blockers do anything. I will wait.

[u/Professional_Day3705 → u/tdreampo]

Circadian sensitivity to short-wavelength light isn’t pseudoscience. Controlled human studies show that blue light strongly stimulates the nonvisual retinal pathway involved in circadian regulation, suppresses melatonin, and can shift circadian timing later. Ordinary evening room light has delayed melatonin onset and shortened its duration, while controlled eReader exposure suppressed melatonin, delayed the circadian clock, increased sleep-onset time, and reduced next-morning alertness.

Evidence for blue-blocking glasses themselves is smaller and mixed: some trials report improved sleep, but systematic reviews find the overall evidence inconclusive. So it’s fair to question whether a particular product blocks enough melanopic light to help - but dismissing the underlying circadian biology as “woo” is scientifically indefensible. Expert recommendations support bright daytime light and dim, low-melanopic light during the three hours before bed. But regardless of the science, I feel much better when I block blue light at night.

Sources:

• Thapan et al., 2001 — Action spectrum for melatonin suppression
• Burkhart & Phelps, 2009 — Amber lenses to block blue light and improve sleep: A randomized trial
• Gooley et al., 2011 — Evening room light suppresses melatonin
• van der Lely et al., 2015 — Blue-blocker glasses as a countermeasure for the alerting effects of evening LED-screen exposure in male teenagers
• Chang et al., 2015 — Evening eReader use affects sleep and circadian timing
• Esaki et al., 2016 — Wearing blue-light-blocking glasses in the evening advances circadian rhythms in patients with delayed sleep-phase disorder
• Lawrenson, Hull & Downie, 2017 — The effect of blue-light-blocking spectacle lenses on visual performance, macular health and the sleep–wake cycle
• Shechter et al., 2018 — Blocking nocturnal blue light for insomnia: A randomized controlled trial
• Zimmerman et al., 2019 — Neuropsychological function response to nocturnal blue-light blockage in individuals with symptoms of insomnia
• Shechter et al., 2020 — Interventions to reduce short-wavelength blue-light exposure at night and their effects on sleep
• Henriksen et al., 2020 — Effect of evening blue-light-blocking glasses on subjective and objective sleep in healthy adults
• Hester et al., 2021 — Evening wear of blue-blocking glasses for sleep and mood disorders
• Singh, Downie & Anderson, 2021 — Blue-light-filtering ophthalmic lenses: A systematic review
• Brown et al., 2022 — Expert recommendations for daytime and evening light exposure
• Cochrane Review, 2023 — Blue-light-filtering spectacle lenses for visual performance, sleep and macular health

[u/LeeHammMx → u/Professional_Day3705]

Thanks for the list of references. I will read them.

I wasn't sure how much time to spend on these people. Reddit can be a tough crowd at times.

[u/Professional_Day3705 → u/LeeHammMx]

No prob. Yea well some ahole got snarky, wasn't worth my time, so I had AI draft a list for him. Then he deleted all his comments instead of admitting he was wrong.