V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

OMR
       Optical Mark Recognition


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

OMR
       Optical Mark Reader (Fax)


The Free On-line Dictionary of Computing (30 December 2018):

Optical Mark Reader
OMR

    (OMR) A special scanning device that can read
   carefully placed pencil marks on specially designed documents.
   OMR is frequenty used in forms, questionnaires, and
   answer-sheets.

   (1995-04-13)