Why do we have watery eyes when we have eyestrain?

Given current lifestyles, we spend most of our time using near vision to read, work on the computer, look at our mobile phones, etc. different situations in which we “forget” to blink (we do so around half the number of times as with distant vision). As a result of less blinking, the tears are not correctly spread over the whole surface of the eye and the eye becomes dry, activating the production of small quantities of tear secretion to make up for the problem. Given that the tear’s response does not remain for long enough on the eye to correct the problem of dryness, it continues to produce tears, which end up overflowing and causing watery eyes.