Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition: Engross. en-grÅsâ², v.t. to occupy wholly, monopolise: to absorb: to copy a writing in a large hand or in distinct characters: to write in legal form: to make gross.âns.
Pupillary distance (PD) is the measurement (in millimeters) of the distance between the pupils of your eyes. Pupillary distance is an important measurement used to determine the proper lens shape and alignment of your prescription correction to your line of vision.
2 Answers. 0. top It's the distance between your pupils. For a pair of glasses to perform as well as they can for you, the lenses need to be made to match the distance between your eyes, so that the centre of each lens aligns with the centre of your pupils. To achieve this, we need your pupillary distance measurement, also called PD measurement.