| 摘要 |
The present invention is a monocular pupillary distance (PD) ruler designed to help an eye care professional align the optical center of prescription eyewear with the patient's eye. The ruler is a planar body having an upper and a lower edge. A bridge is sized and shaped to fit upon the nose of a person being measured for eyeglasses. The bridge is located at a center point of the ruler. The ruler also includes units of measurements originating from the center point and measuring out from either side of the center point. The ruler may include a handhold extending from an end of the ruler. The handhold may be rotatable for ease of storage.
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