Lid dysfunction is a chronic, diffuse abnormality of the lid gland that manifests as blockage of the lid duct opening and changes in the substance and/or amount of lid secretion that can cause lid inflammation and tear instability as well as other ocular surface disorders, the most common of which are posterior blepharitis and lipid deficient dry eye. It is important to note that lid gland dysfunction is very common in the population and that lid gland dysfunction is likely the primary cause of dry eye. Therefore, it is recommended that those who suffer from frequent red eyes visit their doctor for an examination to confirm the presence of lid gland dysfunction and to provide symptomatic and effective treatment.