If you have chronically dry eyes, it would make sense that the goal is to achieve consistent lubrication. In fact, artificial tears, which come in multiple forms, are usually the first level of care for dry eye patients. This can depend on various factors, though, and should only follow a comprehensive examination of the eyes and tear film. Using nonprescription artificial tears for dry eye syndrome could do more harm than good.
Consider that many commercial eye drops are made with preservatives. This prolongs their shelf-life. However, if you're applying lubricating drops with preservatives several times a day, some of the ingredients could ultimately worsen your eye irritation. If you need to apply eye drops more than four times a day, it's imperative that you purchase artificial tears without preservatives. These may not cause irritation. They also may not provide sufficient relief.
Lubricating tears can also come in ointment form. For more severe dry eye symptoms, an ointment may be recommended. However, ointments, due to their thickness, may be better for nighttime use. This is because you may experience cloudy vision for more than a few minutes after applying this type of artificial tears.
Because there are several factors that can influence dry eyes, the ideal approach to remedying your symptoms is to consult with your ophthalmologist.