Dry eyes are mainly treated with the use of artificial tears, and a wide variety of products are available. Artificial tears must be used regularly and more often in dry environmental conditions such as on airplanes, in air-conditioned buildings, and on windy days. While artificial tears are helpful, they often do not last long enough. Thicker preparations are available that last longer. These often are used at bedtime because they sometimes cause blurry vision. Eye drops containing cyclosporine (Cequa, Restasis) or lifitegrast ophthalmic solution (Xiidra) treat inflammation in the glands around the eyes and may help to increase tear production. While Cequa or Restasis are often used at bedtime because they sometimes causes blurry vision, Xiidra is used twice a day.