Etiology - Dry Eye Syndrome is caused by improper tear production. It can usuallly be attributed to factors such as aging, vast hormonal changes, medications, and increased tear evaporation.
Symptoms - Stinging/burning sensation, dryness, redness, visual fatigue, excess tear production (overcompensation for dryness), light sensitvity, and difficulty wearing contacts.
Details - Dry Eye Syndrome is a fairly self-explanatory disease. It is essentially just a nagging feeling of eye irritation or discomfort due to a decrease in the amount and quality of tears produced as lubricant.
Treatment - There is no one-size-fits-all approach since succesful treatment relies on addressing the root cause, which often varies. Common strategies though include prescription eye drops, artificial tears, regular application of a warm compress, and lifestyle changes (e.g., decreased screen time).
Visual example of the difference in tear production in a normal eye vs dry eye.