Every time we go to the optical shop for optometry, we see a series of "Martian characters", a confused water, ask the optometrist's own eyes, and they are all just words, not to say more, as if I was afraid that I know that the degree is not in his glasses. Like, it is very uncomfortable! And as the owner of our own eyes, it is necessary and obligatory to understand our eye health, so my friends of myopia, I have summarized the prescriptions commonly used in optometry, you must be patient The following content is finished!
Pupillary distance is measured in millimeters from the center of one pupil to the center of another pupil. This measurement helps to ensure that your prescription is properly centered in the spectacle lens for the clearest and most accurate vision. PD represents the pupillary distance, which is measured from the right pupil to the left pupil. The PD of the adult is between 54-74. The children are between 43-54.
What is a single PD or dual PD? Dual PD is the measurement from the center of each pupil to the center of the bridge of your nose