Classic Rectangular Frame Spring-Hinged Computer Reading Glasses with Orange Tinted Lenses - Blue Light Blocking for Digital Eye Strain Relief - Perfect for Office Work, Gaming & Screen Time

Per the Occupational Safety & Health Administration: The preferred viewing distance for VDTs ranges between 18 and 24 inches (45.72 and 60.96 centimeters, respectively)Filters 100% of the most damaging low-level blue and nearly 100% high energy visible light from tablets, phones, TV, computers and more.Our lenses code is BB40 for the Eyekepper violet block glasses.We are one of small manufacturer,if you want to custom the different strength for each eye please let us know. Performance via spectrum analyzer Data for Eyekepper's BB40 40% blue light blocking for wavelength 395nm-500nm Data for Eyekepper's BB60 60% blue light blocking for wavelength 395nm-500nm Data for Eyekepper's BB90 90% blue light blocking for wavelength 395nm-500nm Data for Eyekepper's BB98 Nearly 100% blue light blocking for wavelength 395nm-500nm Buying Options Buying Options Buying Options Buying Options Buying Options Customer Reviews — — — — — EYEKEPPER CODE / BB40 BB60 BB90 BB98 LENS COLOR Normal Transparent lens Transparent lens with 12 Layer Coating of Eyekepper Transparent lens with 12 Layer Coating of Eyekepper Amber Tinted with 12 Layer Coating of Eyekepper Orange Tinted with 12 Layer Coating of Eyekepper BLUE LIGHT BLOCK (395nm~500nm, average value) / About 40% About 60% About 90% Nearly 100% UV PROTECT ( 550nm) 95% About 90% About 90% About 80% About 60% VISUAL COLOR DIFFERENCE LEVEL Almost no color difference Almost no color difference Low color difference Medium color difference Serious color difference RGB TEST ONLINE Could not passed Could not passed 30% variation of blue light tests online 70% variation of blue light tests online 95% variation of blue light tests online Blue Light Protection Test with Spectrum Analyzer Spectrum analyzer-Use to test different wavelength from 280nm to 780nm,e.g 400nm,430nm,460nm and 550nm Blue Light Protection Test with Blue Light Meter Use to test wavelength is 450nmThe data of left is visiable lightThe data of middle is blue light remainingThe data of right is UV light remaining Blue Light Protection Test with UV Pen Shape Light and Card Only use to test the data less than 400nm for UV light ,can not use to test the blue light for wavelength more than 400nm Spectrum analyzer Blue light meter UV pen shape light and card Eyekepper's optical performance meter Eyekepper will test below data before shipment via the optical properties meter StrengthPupil distanceHorizontal positionAstigmatismPrism Blue light Spectral distribution If you are unfamiliar with blue light it's right next to UV light on the spectrum of light. It is comprised of very high energy and a low wavelength very similarly to UV light. All of our electronic devices with a back-lit screen give off large quantities of blue light (Iphones, Ipod, Laptop, Computer TV.) This blue light messes with our internal clock making us think it's mid day when really it can be closer to night and stops our body from naturally producing the melanin that helps us fall asleep late at night Note To avoid damage the violet block glasses, never clean the glasses with thefollowing: paper towels clothingalcoholhousehold detergentssoaps Frequently bought together Frequently bought together Frequently bought together Frequently bought together Frequently bought together Buying Options Buying Options Buying Options Buying Options Buying Options Customer Reviews — — 4.6 out of 5 stars 25 4.2 out of 5 stars 41 —