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Oct 12, 2009 - A very popular and reliable type of manual, one-position keratometer a dull appearance it may not sufficiently reflect the mires, making measurements difficult. May 31, 2014 - Jun 2, 2009 - In other words, if the preoperative keratometry reading is off by 0.75 D, the result will be a 0.75 D postoperative refractive surprise, even if all the other Many automatic keratometers take and record peripheral. K-readings. A normal manual instrument may also be adapted to take these readings by placing fourORT5CLA How To: Keratometry. ORT5CLA Keratometry. Loading. A Quick Guide to Reading Corneal Many automatic keratometers take and record peripheral. K-readings. A normal manual instrument may also be adapted to take these readings by placing fourORT5CLA How To: Keratometry. ORT5CLA Keratometry. Loading. A Quick Guide to Reading Corneal Enter the keratometry measurements in this format: 45/43.25@90. This seemed about as simple as could be - on a manual keratometer you record it like so:.