Symptoms of dryness may be the result of many factors e.g. dry climate, dehydration or some disease like Sjogren's syndrome. In order to identify a specific cause of the problem, you have to see a doctor. For skin conditions like dry skin, a dermatologist can prescribe the correct moisturizer, yet for the eyes, an ophthalmologist can suggest eye drops. Self-medication is hazardous and should be totally avoided.