What is the cause of dryness. Bcoz at this age normally dryness is not common.
I presume you are a regular computer user or mobile user if so it might be computer vision syndrome please use lubricant eye drops e.g. teardrop 2to3 times daily and rub ocupol d's eye oint twice daily on lids.
Next Steps
follow 20.20.formula ie close your eyes for 20seconds after every after every 20minutes.keep proper distance between eyes and screen wash your eyes with freshwater and don't sit facing towards ac or blowers consume lots of fresh fruit and vegetables and also do cold compresses with ice .