Well, in my opinion, it can be the allergy which makes your eyes become red. In other words, the allergies around you lead to eye infection in your eyes, and then it turns to red. You can be allergic to something in your work space and you have to check them. For example, the cleaning spray or some dust can possible for red eyes are usually a sign of some type of allergic reaction. Also, you should know that it can be caused by eye strain, if you have a long time looking at computer screen. If it is an allergy, you should avoid it. And also, just keep some rest time for your eyes.