“Dry eye” is a condition that may be caused by anything from minor eye fatigue to Sjögren’s syndrome, a disorder caused by abnormal immune function. The dryness is sometimes accompanied by a burning or gritty sensation. Fortunately, there are lubricants available that are designed to simulate the natural ability of the tears to moisturize and lubricate the eyeball. Typical ingredients include glycerin, polyvinyl alcohol, and carboxymethylcellulose. They vary in viscosity, and none is clearly superior. Therefore, use the one that works best for you. At the same time, because there are many eye conditions that should not be treated with over-the-counter eye drops, see an eye-care professional if you experience discharge from the eye or discomfort associated with contact lenses. Dry eye syndrome has many causes. It can occur as a part of the natural aging process and as a side effect of many medications, such as antihistamines, antidepressants, and certain blood pressure medicines. If you live in a dry climate, you may suffer from dry eye. To reduce symptoms of dry eye, remember to blink regularly when staring at a computer screen for long periods of time.