{"product_id":"ultrassist-pupillary-distance-ruler-for-eyeglasses","title":"Ultrassist Pupillary Distance Ruler for Eyeglasses","description":"\u003ch3\u003eAbout this item\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSTEP-BY-STEP ENGLISH USER GUIDE: An English PDF user guide is available in the Product guides and documents section of this page. It explains preparation, correct ruler positioning, right- and left-eye monocular PD readings, binocular PD calculation, and helpful measurement tips\u003c\/li\u003e\n\u003cli\u003eBINOCULAR AND DUAL PD MEASUREMENT: The marked scales support both a single-number binocular PD reading and separate right and left monocular, or dual PD, values. Align the center notch with the nose bridge and read each measurement at the center of the pupil\u003c\/li\u003e\n\u003cli\u003eCLEAR 1 MM GRADUATIONS: The pupillary distance ruler measures 23–42 mm for each eye and 46–84 mm for binocular PD. Clearly marked 1 mm graduations help you read and record the measurement when the ruler is correctly positioned、\u003c\/li\u003e\n\u003cli\u003eTRANSPARENT FLEXIBLE PVC DESIGN: The clear PVC material keeps the eyes and pupil centers visible during alignment. Lightweight and flexible, this manual PD ruler rests across the nose bridge without batteries, apps, electronic components, or sliding parts\u003c\/li\u003e\n\u003cli\u003eMEASURE WITH A SECOND PERSON FOR BEST RESULTS: Use the PD ruler in adequate lighting while the subject keeps their head straight, still, and facing forward. The measurer should stand directly in front at eye level. Repeat the measurement two or three times to check for consistent readings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOverview\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Polyvinyl Chloride (PVC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Ultrassist\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Transparent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Classic,Straight Edge,Flexible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Range:\u003c\/strong\u003e 1 millimeters\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ultrassist","offers":[{"title":"Default Title","offer_id":67612955377884,"sku":"B0842NXQ3P","price":9.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/0913\/3020\/files\/31a_dTk2bXL.jpg?v=1790840291","url":"https:\/\/stemora.us\/products\/ultrassist-pupillary-distance-ruler-for-eyeglasses","provider":"Stemora","version":"1.0","type":"link"}