Table 1.

The Active Ingredient and Preservative in Each of the 6 Artificial Tear Products

Artificial tear product	Active ingredient	Preservative
HA1	HA 0.1% and CMC	Stabilized oxychloro complex
HA2	HA 0.18%	—
HA3	Trehalose 3% and HA 0.15%	—
HA4	HA 0.15%	—
HA5	HA 0.1% provided in the COMOD device	—
HPG/HA	HPG, HA 0.1%, and demulcents	Polyquad (polyquaternium-1) 0.001%

CMC, carboxymethylcellulose; HA, hyaluronic acid; HA1 (Optive Fusion™; Allergan Limited, United Kingdom); HA2 (Vismed^®; TRB Chemedica International S.A., Switzerland); HA3 (Thealoz Duo^®; Thea Pharmaceuticals Limited, United Kingdom); HA4 (Hyabak^®; Thea Pharmaceuticals Limited, United Kingdom); HA5 (Hylo-Comod^®; URSAPHARM Arzneimittel GmbH, Germany); and HPG/HA (Systane^® Hydration; Alcon Research Ltd., Fort Worth Texas); HPG/HA, hydroxypropyl guar/hyaluronic acid-containing dual-polymer lubricant formulation.