Xailin Night Lubricating Eye Ointment acts as a barrier against moisture loss, providing strong soothing relief from dry eye sensations at night. It is the perfect product to use right before bed. Dry eye symptoms, such as soreness, irritation, or a gritty sensation, are caused by ocular surface disorders, which can be caused by a variety of factors, where normal tears are either produced insufficiently or of poor quality to keep the eye sufficiently moist.