['dry eye syndromes']
['carboxymethylcellulose based eye drop', 'carboxymethylcellulose sodium 0.5%']

        Inclusion Criteria:

          -  Used artificial tears for dry eye

          -  Visual acuity of at least 20/32 (while wearing glasses, if necessary).

        Exclusion Criteria:

          -  Use of contact lenses in the last 3 months, or anticipated use of contact lenses
             during the study

          -  Herpes keratitis in the last 6 months

          -  Cataract surgery, laser-assisted in situ keratomileusis [LASIK], or photorefractive
             keratectomy, within the last 6 months
      