That’s a good question. Posture correctors are back devices with one job: pulling your shoulders into alignment with your spine. They work by supporting your neck, shoulders, and spine to stay in a proper position.
We could prevent quite a lot of work related injures just by sitting with a better posture in front of our computers. What most people don't know, are the rumors that are going around the workplaces saying we're supposed to sit at 90-degrees and we'll be fine.