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.
Two PD values. A lower one for reading, a higher one for distance. Now if you remember moving the lenses in front of your eyes, and the index finger pupil experiment, and how your glasses are intended (and measured) for distance vision, it should all come together for you.