theratears nighttime dry eye therapy- lubricant eye gel-preservative free provides soothing, overnight relief of dry eye symptoms. the unique hypotonic and electrolyte balanced formula replicates healthy tears and is preservative free for sensitive eyes. theratears is doctor created and doctor recommended and available in convenient, single-use vials., theratears nighttime dry eye therapy- lubricant eye gel- preservative free- 28 ct.