Silver Book Fact
Chronic dry eye has a clinically important impact on approximately 4.25 million Americans age 50 and older–3.2 million women and 1.05 million men.
Schamberg D, ScheinOd G. Smolin and Thoft’s The Cornea: Scientific Foundations and Clinical Practice: 4th ed.. Philadelphia, PA: Lippincott Williams & Wilkins; 2004. https://www.amazon.com/Smolin-Thofts-Cornea-Scientific-Foundations/dp/0781742064