Anterior chamber: fluid-filled space inside the eye between the iris and cornea. The anterior chamber is filled with a watery substance called the aqueous humor that maintains the pressure within the eye.1,2

Cornea: clear part of the outer coat of the eyeball that covers the iris, pupil, and anterior chamber. The cornea helps focus the entry of light into the eye and accounts for almost two-thirds of the eye’s total focusing power.1,2

Iris: colored part of the eye in front of the lens that controls the amount of light reaching the retina2

Lens: curved surface of the eye that brings rays of light to a focus in the retina. It can change shape through muscles in the eye to help focus on objects at different distances. The lens accounts for approximately one-third of the eye’s total focusing power.2

Macula: small and highly sensitive part of the retina responsible for detailed central vision1,2

Optic nerve: nerve that carries visual impulses from the retina to the brain2

Pupil: round hole in the center of the iris that allows light to reach the retina1

Retina: light-sensitive layer of receptors and nerves at the back of the eye that converts light into a focused image. The retina contains cells called rods (which produce black-and-white and night vision) and cones (which produce color vision).1,2


ZIRGAN is used to treat eye ulcers caused by a herpes virus.


  • ZIRGAN should only be used in the eye.
  • Do not wear contact lenses while using ZIRGAN or anytime you have signs or symptoms of an eye infection.
  • The most common side effects reported in patients were blurred vision, eye irritation, eye redness and punctate keratitis (a specific type of eye surface irritation).
  • Safety and efficacy in children below the age of 2 years have not been established.
  • Consult your doctor if you experience pain, redness, itching or swelling of the eye when using ZIRGAN.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit, or call

Click here for full Prescribing Information for ZIRGAN.

To contact Bausch + Lomb, call 1-800-323-0000 or visit

References: 1. Riordan-Eva P, Asbury T, Whitcher JP. Glossary of terms relating to the eye. In: Vaughan & Asbury’s General Ophthalmology. 16th ed. New York, NY: McGraw-Hill Co, Inc; 2004:436-440. 2. Glossary of eye terminology. In: Cassin BC, Rubin ML. Dictionary of Eye Terminology. 6th ed. Gainesville, FL: Triad Publishing Co; 2011. Accessed August 12, 2015.

Zirgan is a trademark of Laboratoires Théa Corporation used under license.

ZGN.0014.USA.17 v8.0