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.
Whether your PD being off 1 mm makes a difference or not depends highly upon your glasses prescription, the higher your prescription, the more 1 mm will make a difference for you. Also, I guess you aren't in the USA but an optometrist should not charge you for giving you your pupillary distance.