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How Eyeglasses Work

HOW EYEGLASSES WORK AND THE TECH THAT HELPS In 1784, Benjamin Franklin invented bifocal glasses, allowing him to read and see long distances at the same time A BRIEF HISTORY OF GLASSES Plastic materials advanced style and utility 13th CENTURY 18th CENTURY 19th CENTURY 20th CENTURY First glasses known to history, used and spread by scholarly monks Added temples to hold glasses over the ears, allowing hands-free use Mass-produced frames and lenses made glasses accessible to all Lenses became lighter, less breakable and coated to reduce harmful light Today, 184 million Americans wear glasses – about 64% of the population BUT HOW MANY KNOW HOW THEIR GLASSES ACTUALLY WORK? FORM AND FUNCTION WHY DO I NEED GLASSES? Astigmatism Мyopia Нуperopia 36% 33% 4% of Americans experience this of Americans need eyewear due to nearsightedness. of Americans need vision correction due to farsightedness. light refraction issue. IF YOU HAVE ASTIGMATISM: IF YOU ARE NEARSIGHTED: IF YOU ARE FARSIGHTED: Imperfectly curved corneas result in blurry vision Light rays focus in front of the retina instead of Light rays don't have focus point even once directly on it they reach the retina Glasses correct this Glasses correct this This can often соmpound with by diverging light rays backward by converging light rays forward other vision issues Presbyopia, or age-related farsightedness, affects 25% of people worldwide HOW GLASSES WORK Curved lenses bend light rays as they approach the retina The strength of the prescription changes with the degree of the curve CONVEX LENSES Used to correct nearsightedness CONCAVE LENSES Used to correct farsightedness previous previous focal point focal point 10 - retina retina light light corrected focal point corrected focal point Bends the light The stronger the Spreads the light away from the center of the lens The stronger the lens, the farther the focal point is from the lens toward the bottom lens, the closer the focal point is to the lens and the top of the lens, pushing the focal point back to the retina and moves the focal point up MULTIFOCAL LENSES Can include correction for distance, near and intermediate vision intermediate Each lens is broken into 2-3 segments with different correction distance near Progressive lenses have the same benefits as bifocals or trifocals, BUT WITHOUT VISIBLE LINES ADVANCEMENTS IN LENS TECH COMPARED TO TRADITIONAL GLASSES, THE LATEST TECH OFFERS GREAT BENEFITS REDUCED GLARE BETTER FILTERING & SUNLIGHT LENS MATERIALS WAVELENGTHS Polarized Lenses High-Index Plastic Color Enhancing Special filters modify the wavelength of light to make colors clearer for Allows lenses to be thinner and Reduce glare from screens and other reflective surfaces - like a calm lake - to reduce eye fatigue lighter than glass – and offers better protection against UV rays those with red-green colorblindness Polycarbonate & Trivex Up to 10X more impact-resistamt than plastic – recommended for glasses, sports players and children Light-Adaptive Lenses Blue Light Blocking Filters out blue light from Automatically adjust their tint to current light conditions - staying clear while indoors and darkening in the sun digital screens that contributes to eye strain and may interfere with your sleep cycle New tech is changing how we look at (and in) VISION WEAR THE FUTURE OF EYEWEAR Smart Glasses + Incorporate sensors, bone conduction speakers and gesture controls Allow hands-free calling, wireless music listening and activity tracking Some models are even equipped with a camera and mini display RESULT Glasses could replace other wearable tech and handheld devices Nano-Drops + 3-step system which measures light refraction using a smartphone app O An individual's optical pattern is measured by a laser device and then specially made nanoparticle drops are used to change the trajectory of light passing through the cornea RESULT Eye drops could replace corrective lenses Visual Cortical Prosthesis System + A brain implant using a camera attached to glasses, designed to give sight to those without Converts images to electrical impulses in the user's brain RESULT Blind users may be able to see again WHAT'S NEXT? Researchers are developing auto-focusing smart glasses using eye-tracking technology to focus near or far, depending on where you look VISION TECH IS CHANGING ARE YOUR GLASSES KEEPING UP? SOURCES presented by transitions.comven-us'see-past-fascinating-history-eyeglasses aao.orgleve-health/ask-ophthalmologist-q/bifocals-trifocals-differences ALL ABOUT VISION DEVELOPED BY N NOWSOURCING

How Eyeglasses Work

shared by NowSourcing on Dec 03
When tech has been around so long that you forget how it works, it is being taken for granted. Learn more about the technology behind vision correction!




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