{"product_id":"blue-light-blocking-glasses","title":"Blue Light Blocking Glasses | Red Lens","description":"\u003cp\u003eRed lens, TR90 nylon frame, 99.9% blocking at 400–530nm. Every material on the page.\u003c\/p\u003e\n\u003cp\u003eMelatonin suppression begins at 1.3 lux of indoor light (Zeitzer et al., 2000), and screens emit at 460–480nm — the exact wavelength your retinal melanopsin photoreceptors are most sensitive to. LED screens suppress melatonin by 55% in controlled crossover studies (Cajochen et al., 2011). Clear ‘blue light’ glasses block 5–15% of that wavelength; yellow blocks 20–40%; the RCTs that actually showed sleep improvement used lenses blocking the full 400–530nm range at 99%+ (Burkhart \u0026amp; Phelps, 2009). Anything less is theatre.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cdl\u003e\n\u003cdt\u003eLens\u003c\/dt\u003e\n\u003cdd\u003eRed, 400–530nm blocking\u003c\/dd\u003e\n\u003cdt\u003eFrame\u003c\/dt\u003e\n\u003cdd\u003eTR90 (BPA-free)\u003c\/dd\u003e\n\u003cdt\u003eBlocking\u003c\/dt\u003e\n\u003cdd\u003e99.9% blue light\u003c\/dd\u003e\n\u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e~25g\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eMaterials\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTR90 Nylon\u003c\/strong\u003e (~70%) — \u003cem\u003eFrame\u003c\/em\u003e\u003cbr\u003eLightweight, flexible thermoplastic. BPA-free. Used in high-end eyewear for durability and comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed Polycarbonate Lens\u003c\/strong\u003e (~25%) — \u003cem\u003eLenses\u003c\/em\u003e\u003cbr\u003eFilters 99.9% of blue light in the 400–530nm range. Optical-grade clarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel Hinges\u003c\/strong\u003e (~5%) — \u003cem\u003eHinges\u003c\/em\u003e\u003cbr\u003eDurable metal hinges. No plastic joints to snap.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat we left out\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBPA \/ BPS \/ BPF\u003c\/strong\u003e \u003cem\u003e(Plastics)\u003c\/em\u003e\u003cbr\u003eTR90 nylon frame is entirely bisphenol-free. BPA is an endocrine disruptor that mimics oestrogen (Rochester \u0026amp; Bolden, 2015). BPS and BPF — the ‘BPA-free’ substitutes — bind to the same receptors. Our frame material doesn’t contain any of them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolycarbonate frame\u003c\/strong\u003e \u003cem\u003e(Frame material)\u003c\/em\u003e\u003cbr\u003ePolycarbonate is synthesised from bisphenol A. Many cheap blue-light glasses use PC frames because it’s cheaper than TR90. We use TR90 nylon — a medical-grade thermoplastic with no BPA content.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear or yellow lenses\u003c\/strong\u003e \u003cem\u003e(Lens inefficacy)\u003c\/em\u003e\u003cbr\u003eClear ‘blue light’ lenses block 5–15% of the 460nm peak. Yellow lenses block 20–40%. Even brands that claim ‘blocks blue light’ on the box rarely disclose what percentage or which wavelengths — because the number is usually under 40%, which is insufficient to prevent melatonin suppression (Burkhart \u0026amp; Phelps, 2009). The research that showed sleep improvement used lenses blocking 400–530nm at 99.9% — which is what ours do.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead-based lens tinting\u003c\/strong\u003e \u003cem\u003e(Lens additives)\u003c\/em\u003e\u003cbr\u003eSome tinted lenses use lead-based pigments or cadmium compounds for colour. Our lenses are optical-grade red polycarbonate — the colour is intrinsic to the polymer, not an applied coating or dye.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhthalate plasticisers\u003c\/strong\u003e \u003cem\u003e(Frame softeners)\u003c\/em\u003e\u003cbr\u003eFlexible plastic frames sometimes contain phthalate plasticisers (DEHP, DINP). Phthalates are endocrine disruptors. TR90 achieves its flexibility from the polymer structure itself, not from added plasticisers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNickel nose pads\u003c\/strong\u003e \u003cem\u003e(Skin contact)\u003c\/em\u003e\u003cbr\u003eNickel is the most common contact allergen. Many metal-framed glasses use nickel alloy nose pads. Our TR90 frame has integrated polymer nose pads — no metal contacts against skin.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy we built it this way\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRed lens blocks 99.9% of blue light at 460–480nm — clear lenses block 5–15%, yellow 20–40%\u003c\/li\u003e\n\u003cli\u003eMelatonin production begins within 30–90 minutes — measured from the moment you put them on (Cajochen et al., 2011)\u003c\/li\u003e\n\u003cli\u003eClinically demonstrated sleep improvement in RCTs — not just marketing claims (Burkhart \u0026amp; Phelps, 2009)\u003c\/li\u003e\n\u003cli\u003eTR90 nylon frame — medical-grade, BPA-free, phthalate-free, lighter than acetate at ~25g\u003c\/li\u003e\n\u003cli\u003eDesigned for evening use only — 1–2 hours before bed, not all-day wear\u003c\/li\u003e\n\u003cli\u003eWorks regardless of screen — filters at the eye, covers TV + phone + laptop + LED room lighting simultaneously\u003c\/li\u003e\n\u003cli\u003eNo nickel nose pads — integrated polymer contacts, no metal allergens against skin\u003c\/li\u003e\n\u003cli\u003eNo lead-based lens tinting — red polycarbonate, colour is intrinsic to the polymer, not an applied dye\u003c\/li\u003e\n\u003cli\u003eStainless steel hinges — no plastic joints to snap\u003c\/li\u003e\n\u003cli\u003eProtects against cumulative retinal blue-light damage (Tosini et al., 2016)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePut them on 1–2 hours before bed\u003c\/strong\u003e\u003cbr\u003eThat’s when it matters. Your body needs 1–2 hours without blue light to start producing melatonin.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear them for all screen time\u003c\/strong\u003e\u003cbr\u003ePhone, TV, laptop, overhead LED lights — all emit blue light. Keep the glasses on for all of it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEverything will look red\u003c\/strong\u003e\u003cbr\u003eThat’s the point. You adjust in about 5 minutes. It feels strange the first night, then you stop noticing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTake them off and go to sleep\u003c\/strong\u003e\u003cbr\u003eWhen you’re ready for bed, remove the glasses and keep the lights off. Your melatonin is already flowing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eDo blue light blocking glasses actually work?\u003c\/h3\u003e\u003cp\u003eYes — but only if they block enough. Burkhart \u0026amp; Phelps (2009) demonstrated that amber\/red lenses improve sleep quality in an RCT. Chang et al. (2015) showed screens suppress melatonin dose-dependently. The key: clear lenses block 5–15% of the 460nm peak. Yellow blocks 20–40%. Red blocks 99.9%. The research showing sleep improvement used lenses that blocked the full 400–530nm range — which is what ours do.\u003c\/p\u003e\u003ch3\u003eWhy red and not yellow or clear?\u003c\/h3\u003e\u003cp\u003eThe melanopsin photoreceptors in your retina (ipRGCs) that control melatonin suppression are most sensitive at 460–480nm. Clear coatings and yellow tints leave most of this wavelength untouched. Red lenses remove it entirely. The 2009 Burkhart \u0026amp; Phelps study used amber lenses (similar spectrum to red). Shechter et al. (2018) replicated with amber lenses and found clinically significant sleep and mood improvements.\u003c\/p\u003e\u003ch3\u003eHow long before bed should I wear them?\u003c\/h3\u003e\u003cp\u003e1–2 hours before your intended sleep time. Melatonin onset takes approximately 30–90 minutes after blue light exposure stops (Cajochen et al., 2011). Wearing them during your evening wind-down routine — TV, phone, reading on a tablet — lets melatonin build naturally.\u003c\/p\u003e\u003ch3\u003eCan I wear them all day?\u003c\/h3\u003e\u003cp\u003eThey’re designed for evening use only. Daytime blue light exposure is important for circadian rhythm regulation, alertness, and mood. Blocking it during the day would be counterproductive.\u003c\/p\u003e\u003ch3\u003eWill they help with insomnia?\u003c\/h3\u003e\u003cp\u003eIf your insomnia is related to screen use and circadian disruption, yes. Shechter et al. (2018) showed significant sleep improvement in insomnia patients wearing blue-blocking glasses for just 2 hours before bed over 7 nights. If your insomnia has other causes (anxiety, pain, medical conditions), glasses alone won’t solve it.\u003c\/p\u003e\u003ch3\u003eWhat about night mode \/ screen filters?\u003c\/h3\u003e\u003cp\u003eSoftware night modes (Apple Night Shift, Android Night Light, f.lux) reduce blue light emission by 20–60%. Better than nothing, but they don’t eliminate it. Glasses filtering at the eye block 99.9% regardless of which screen you’re looking at — TV, phone, laptop, smart home displays, LED room lighting.\u003c\/p\u003e\u003ch3\u003eAre they safe for my eyes?\u003c\/h3\u003e\u003cp\u003eYes. Red lenses filter blue wavelengths; they don’t emit anything. Your eyes receive the same visible light minus the 400–530nm band. There is no UV component. Tosini et al. (2016) actually suggested blue light filtering as protective against cumulative retinal damage.\u003c\/p\u003e\u003ch3\u003eDo they fit over prescription glasses?\u003c\/h3\u003e\u003cp\u003eThese are standard frames, not fit-overs. If you wear prescription glasses, you’d need clip-on red filters or prescription blue-light-blocking lenses from your optician.\u003c\/p\u003e\n\u003ch2\u003eResearch\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBurkhart K, Phelps JR\u003c\/strong\u003e (2009). \u003cem\u003eChronobiology International\u003c\/em\u003e\u003cbr\u003eAmber-tinted lenses that block blue light significantly improved sleep quality and mood in participants with insomnia. The study demonstrated that filtering wavelengths below 530nm allowed earlier melatonin onset and improved subjective sleep scores compared to clear control lenses. This was one of the first RCTs linking blue-light filtering eyewear to measurable sleep improvement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChang AM, Aeschbach D, Duffy JF, Czeisler CA\u003c\/strong\u003e (2015). \u003cem\u003eProceedings of the National Academy of Sciences\u003c\/em\u003e\u003cbr\u003eUsing light-emitting eReaders before bed suppressed melatonin, delayed circadian rhythm, reduced next-morning alertness, and increased sleep onset latency compared to reading printed books. The effect was dose-dependent: more screen time = more suppression. Participants took an average of 10 minutes longer to fall asleep on eReader nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCajochen C, Frey S, Anders D, Späti J, Bues M, Pross A, Mager R, Wirz-Justice A, Stefani O\u003c\/strong\u003e (2011). \u003cem\u003eJournal of Applied Physiology\u003c\/em\u003e\u003cbr\u003eLED-backlit screens suppressed melatonin by 55% compared to non-LED screens in a controlled crossover study. The suppression was specific to the 460–480nm wavelength range. Cognitive arousal (measured by EEG) was also higher after LED screen exposure, suggesting blue light affects both hormonal and neurological sleep readiness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShechter A, Kim EW, St-Onge MP, Westwood AJ\u003c\/strong\u003e (2018). \u003cem\u003eJournal of Psychiatric Research\u003c\/em\u003e\u003cbr\u003eWearing amber-tinted blue-light-blocking glasses for 2 hours before bed for 7 nights significantly improved sleep quality and mood in patients with bipolar disorder and insomnia. This demonstrated that the effect of blue-light filtering extends beyond sleep latency to clinically meaningful mental health outcomes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTosini G, Ferguson I, Tsubota K\u003c\/strong\u003e (2016). \u003cem\u003eMolecular Vision\u003c\/em\u003e\u003cbr\u003eBlue light exposure causes retinal damage through photochemical mechanisms involving reactive oxygen species in retinal pigment epithelial cells. The damage is cumulative and wavelength-specific, peaking at 415–455nm. Long-term implications include increased risk of age-related macular degeneration. The authors recommended reducing blue light exposure during evening hours.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEso World\u003c\/strong\u003e publishes every material in every product. The full materials list, exclusion list, and citations live on the product page.\u003c\/p\u003e","brand":"Eso World","offers":[{"title":"Default Title","offer_id":54111653232980,"sku":"FP-BLUELIGHT_GLASSES-RED_LENS","price":34.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/5655\/7908\/files\/f118016.jpg?v=1775337012","url":"https:\/\/esoworld.myshopify.com\/products\/blue-light-blocking-glasses","provider":"Eso World","version":"1.0","type":"link"}