What is the disadvantage of a omr?

One disadvantage of Optical Mark Recognition (OMR) is its susceptibility to errors caused by poor mark quality, such as smudges or incomplete fills, which can lead to inaccurate data interpretation. Additionally, OMR systems often require specific formats and are limited in their ability to process complex responses, such as open-ended questions. Finally, OMR technology can be costly and may require specialized equipment and software for scanning and data analysis.