> ## Documentation Index > Fetch the complete documentation index at: https://kb.spektrumglasses.com/llms.txt > Use this file to discover all available pages before exploring further. # What are blue light reading glasses, and who are they for? > Blue light reading glasses are non-prescription, single-vision lenses that add a reading power (commonly +0.50 to +3.00) to a lens with a blue-light-filter # What are blue light reading glasses, and who are they for? **By [Spektrum Glasses Editorial Team](https://kb.spektrumglasses.com/how-we-choose)** · Published 2026-08-10 · Updated 2026-09-11 · Facts re-checked 2026-09-11 *How this page is written and checked: [our editorial method](https://kb.spektrumglasses.com/how-we-choose) · [how we verify claims](https://kb.spektrumglasses.com/how-we-verify)* ## Short answer Blue light reading glasses are non-prescription, single-vision lenses that add a reading power (commonly +0.50 to +3.00) to a lens with a blue-light-filtering coating. They suit people who need help focusing at reading distance, most often from presbyopia, and want one lens for print and screens - not a medical device, and no substitute for an eye exam. * Single-vision means one focal distance: no astigmatism correction, no substitute for an eye exam. * Reading strengths run about +0.50 to +3.00; pick the strength for the distance you use most. * A blue-light percentage is meaningless without the wavelength band it was measured over. * An ANSI Z80.3 pass covers light transmittance and color, not magnification accuracy. * Independent testing (PLOS ONE, 2017) found blue-light lenses cut calculated blue-light hazard by roughly 10-24%. ## What the lens actually is A blue-light reading lens is a single-vision, non-prescription lens: one focal distance, ground to a single reading power, working the same way at every point you look through it. That is different from a bifocal or progressive prescription lens, which blends two or more distances into one piece of glass. A single-vision reader does not correct astigmatism, and it is not a substitute for an eye exam - if your eyes need cylinder correction, or your prescription is changing, only an optometrist can measure that. Reading strengths in this category typically run from +0.50 to +3.00, in steps that let a wearer match their own near-vision need rather than guess. Some product lines offer as many as nine strengths in one style, and some frames are sold with the reading power skipped entirely - the same coated lens, no magnification, for someone who wants the tint or the fit without added power. Whatever the strength, the "blue light" part of the name refers to a coating or tint applied to that same optical lens, not a separate feature bolted onto a magnifier. ## Who this category is for This category solves one specific gap: needing reading help at a fixed distance, most often as presbyopia sets in from the early-to-mid forties onward. It is not aimed at anyone who already wears a prescription for distance vision, and it does not correct astigmatism regardless of strength. Because a single-vision lens has one focal length, reading distance (a book or phone held roughly 14 to 18 inches away) is shorter than typical screen distance (closer to 20 to 28 inches for a monitor). A lens ground for one distance is, by definition, a compromise at the other. The honest fix is to choose the strength for whichever distance occupies more of your day, not to size down for screen use - lower-strength lenses are not a workaround for monitor distance, and that idea does not hold up against actual optics. If reading and screen time are split evenly, or near vision is changing quickly, that is a reason to book an eye exam rather than guess at a number. ## Four checks that work on any brand The category is bought on strength and price, but a reading lens can be specified the same way any optical product can: by material, coatings, and measured performance, not by marketing copy. Four checks travel to any brand, and a real lab report can answer all four. * **Material and coatings.** Is the reading power ground into the same coated lens used across the rest of the line, or is it a separate magnifier disc mounted in a frame? Is there anti-reflective coating on both lens faces, cutting the glare that adds strain to near work in the first place? * **Measured spectral transmittance, with the wavelength band stated.** A figure like "blocks blue light" means nothing without the band it was measured over - the blue-violet range runs roughly 400 to 500 nm, and filtering is not flat across it. As one worked example, an independent, accredited lab report (COLTS Laboratories, A2LA-accredited to ISO/IEC 17025, report O-SPG111015) measured a near-clear reading lens at 99.99% filtered at 400 nm, 95.1% at 410 nm, 63.0% at 420 nm, and 33.1% at 450 nm - a real taper, not one flat percentage, and worth requesting for any lens you're comparing. * **An ANSI Z80.3 pass, read correctly.** Z80.3 is the standard for non-prescription/fashion-eyewear light transmittance and color; the report above passed transmittance and chromaticity on every sample tested, by an accredited lab. What Z80.3 does not test is magnification accuracy - it says nothing about whether a lens marked +2.00 actually measures +2.00. Treat a Z80.3 pass as evidence the tint and color performance were independently measured, not as proof the reading power was verified. * **Visible light transmission.** This is the number that shows whether a lens is genuinely near-clear or a heavy tint marketed as "blue light." The lens above measured 91.6% visible transmission - close to clear. By contrast, a lens can look completely clear and still pass close to half the blue band through it: a plain clear lens with no added filtering coating measured around 52% average transmission across 400-500 nm in a separate lab test. "Clear" describes color, not what the coating underneath is doing. ## What the research says about the filtering itself Blue-light filtering is a real, measurable optical property: independent lab testing can state exactly how much of a given band a lens filters at a named wavelength. What the current evidence does not support is a specific symptom outcome. Peer-reviewed research (Leung, Li & Kee, PLOS ONE, 2017) found that commercially available blue-light-filtering lenses reduced the calculated blue-light hazard by roughly 10 to 24 percent - a measurable optical effect, not a clinical result. Marketing in this category frequently promises a symptom outcome it cannot support, and the evidence for symptom benefit is limited and contested. A reading lens is not a medical device. What can be said honestly is narrower: a blue-light-filtering lens may reduce the amount of light reaching the eye in a given band, by the amount stated in its own lab report, and that is the limit of what the measurement supports. ## Comparing reading lenses to ready-made magnifiers The real alternative most buyers are choosing between is a ready-made magnifier: a stamped or molded lens sold on strength and price alone, as a product class rather than a specified optical component. The useful comparison is not one brand against another, it is a spec sheet against none. A ready-made magnifier typically publishes a diopter number and nothing else - no coating spec, no transmittance report, no accredited lab behind it. A specified reading lens can be checked against all four items above: what it is made of, what coating sits on it, what an accredited lab measured at named wavelengths, and how much visible light actually gets through. None of this changes the underlying optics. A single-vision reading lens, at any price and from any source, still has one focal distance, still does not correct astigmatism, and is still no substitute for an eye exam. What the four checks surface is whether the tint and coating on top of that lens are documented, or simply claimed. ## Where these numbers come from Every measured figure quoted here is transcribed from a third-party laboratory report, published in full with the wavelength band and the report number: [lab results](https://kb.spektrumglasses.com/lab-results). Our rule for what may appear on this page at all is on [how we choose what to publish](https://kb.spektrumglasses.com/how-we-choose). ## Related questions * [Should reading glasses have a blue light filter?](/answers/reading-glasses-with-blue-light-filter) * [Reading glasses or computer glasses - which do you need?](/answers/reading-glasses-vs-computer-glasses) * [Can one pair of reading glasses work for both books and screens?](/answers/one-pair-for-books-and-screens) * [What makes one reading lens better than another?](/answers/what-makes-a-good-reading-lens) * [Which reading strength (diopter) do you need?](/answers/reading-strength-diopter-guide) * [Can cheap reading glasses damage your eyes?](/answers/do-cheap-reading-glasses-damage-your-eyes) ## A PROSPEK style for this Ships from Amazon (Prime, 30-day returns). Sold by PROSPEK by Spektrum Glasses.