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The cleanniess of the lenses of your reading glasses affect your vision. However,if you clean your lenses too much, or too often, you run the risk of scratching your lens. Here are some Tips of Do's and Don'ts for your reference. Do's ✔ Clean your glasses every morning.Daily cleaning makes your eyewear easier to maintain and extend their lifespan. Please use microfibre cleaning cloths to clean glasses. Just make sure you wash your microfibre cloths frequently. When doing so, do not use fabric softener. Apply a small drop of neutral hand soap to each lens and rinse it under a light stream...

What Does PD Mean? PD stands for the pupillary distance, and it refers to the distance in millimeters between the center of one pupil to the center of the other.  Why it is so Important？ Wrong PD may result in viewing through a spot on the lens other than the ‘optical center’. You may experience blurriness, eye strain, double vision, headaches etc.  How to Measure Your PD? Step1 Prepare a Mirror and a Ruler Step2 Stand 8-10 inches away from the mirror,and look into the mirror Step3 Pick a ruler and place it just above the eyes and lining up the 0...

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 90% high energy visible light from tablets, phones, TV, computers and more. Our lenses code is BB90 for the Eyekeeper blue block glasses. If you want to custom the different strength for each eye please let us know. Performance via spectrum analyzer 90% blue light blocking for wavelength 395nm-500nm Data for Eyekeeper BB90 Lens   shop our BB90 Lens