Editing Optical mark recognition (section)

===Optical answer sheet===
[[File:SAT-Grid-In-Example.svg|thumb|350x350px|A response to an [[SAT]] math question marked on an optical answer sheet]]
An optical answer sheet or bubble sheet is a special type of [[form (document)|form]] used in multiple choice question examinations. OMR is used to detect answers. The [[Scantron Corporation]] creates many optical answer sheets, although certain uses require their own customized system.{{citation needed|date=January 2013}}

Optical answer sheets usually have a set of blank ovals or boxes that correspond to each question, often on separate sheets of paper. [[Bar code]]s may mark the sheet for automatic processing, and each series of ovals filled will return a certain value when read. In this way students' answers can be digitally recorded, or identity given.