What is another word for pupillary distance?
Pronunciation: [pjˈuːpɪləɹi dˈɪstəns] (IPA) 
Pupillary distance, also known as PD, is the distance in millimeters between the center of your pupils. This measurement is important when it comes to ordering prescription glasses or contacts because it helps to ensure that the optical center of the lenses is aligned with your pupils. Some synonyms for pupillary distance are: interpupillary distance, distance between pupils, or simply pupil distance or PD. These terms are often used interchangeably. It's important to have an accurate pupillary distance measurement so that your eyewear correctly corrects your vision and prevents discomfort or headaches. Your eye doctor can measure your PD during an eye exam.
