When you are concentrating on a specific task either on a screen or in a book, you blink far less than if you were having a conversation with someone.
Every time you blink little glands in your upper and lower eyelids, called Meibomian glands, spread a thin layer of oil across the surface of your eye. This layer is what keeps the watery layer in place and keeps your eyes feeling fresh and comfortable.
A decreased blink rate means your eyes are not getting the oil layer of tears from your Meibomian glands. This means your tears evaporate quicker than they should and may leave you experiencing symptoms of dry eye. When you’re performing a specific task which requires focus and concentration, be sure to be conscious of whether or not you’re blinking. Possibly blink repetitively for a few seconds every so often to help spread the tears evenly over your eyes to make up for a decreased blink rate.