Artificial Tears Market Size, Share & COVID-19 Impact Analysis, By Type (Polyethylene Glycols (PEG) and Polypropylene Glycols (PPG), Cellulose, and Others), By Delivery (Eye Drops, and Ointments), By Application (Dry Eye Syndrome, Allergies & Infections, and Others), By Distribution Channel (Hospital Pharmacies, Drug Stores & Retail Pharmacies, and Online Pharmacies), and Regional Forecast, 2020-2027