Watering may be due to refractive error at the age of 24 yrs ,you should get your refraction checkup & use antiglare glass. Most of the people are suffering from dryness who are working on computer or laptop. All software professionals are having same problems because most of them don't know how to work on computer for long time without giving discomfort to eyes. While working on computer number of blinking drastically goes down from around 24 per minute to around 8 per minute leading to severe dryness causing burning ,eyestrain, temporary blurring of vision,& headache.One should try to have normal blinking while working on computer ,should look away from screen after every 10 minute& should take rest for 10 minutes after every two hours. You should also use lubricating eye drops( Systane ultra) 5-6 times daily & genteal gel once at bed time+ Tobrex eye drops 4-5 times.