title: Increased homocysteine levels in tear fluid of patients with primary open-angle glaucoma.
abstract: OBJECTIVE
  We assessed homocysteine (Hcy) levels in tear fluid and plasma of patients with primary open-angle glaucoma (POAG). We determined the association between Hcy levels, dry eye syndrome and B vitamin status.
  
  
  METHODS
  This prospective case-control study included 36 patients with POAG and 36 controls. Hcy concentrations were measured by high-performance liquid chromatography.
  
  
  RESULTS
  Patients with POAG had significantly higher mean Hcy levels both in tear fluid (205 +/- 84 nmol/l; p < 0.001, t test) and in plasma (13.43 +/- 3.53 micromol/l; p = 0.001, t test) than control subjects (130 +/- 53 nmol/l and 10.50 +/- 3.33 micromol/l, respectively). Hcy in tear fluid was significantly correlated with plasma Hcy in POAG patients (r = 0.459; p = 0.005, Pearson's correlation), but not in controls (r = 0.068; p = 0.695). POAG patients with dry eye disease had significantly higher Hcy levels both in tear fluid and plasma than POAG patients without dry eye disease. There was no association between Hcy levels and B vitamin status in subjects with POAG.
  
  
  CONCLUSIONS
  The study suggests increased Hcy levels in tear fluid and plasma of patients with POAG. Elevated Hcy levels might be a risk factor for POAG and dry eye syndrome in subjects with glaucoma.
authors.affiliation: Department of Ophthalmology, University Eye Hospital, Erlangen-Nuremberg, Germany. Johannes.Roedl@augen.imed.uni-erlangen.de
authors.forename: J B
authors.initials: JB
authors.lastname: Roedl
authors.forename: S
authors.initials: S
authors.lastname: Bleich
authors.forename: U
authors.initials: U
authors.lastname: Schlötzer-Schrehardt
authors.forename: N
authors.initials: N
authors.lastname: von Ahsen
authors.forename: J
authors.initials: J
authors.lastname: Kornhuber
authors.forename: G O H
authors.initials: GO
authors.lastname: Naumann
authors.forename: F E
authors.initials: FE
authors.lastname: Kruse
authors.forename: A G M
authors.initials: AG
authors.lastname: Jünemann
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D002851:Chromatography, High Pressure Liquid; D015352:Dry Eye Syndromes / Q000097:blood / Q000378:metabolism; D005260:Female; D005902:Glaucoma, Open-Angle / Q000097:blood / Q000378:metabolism*; D006710:Homocysteine / Q000378:metabolism*; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012307:Risk Factors; D013666:Tears / Q000378:metabolism*; D014803:Vitamin B Complex / Q000097:blood
chemical_list: D006710:Homocysteine; D014803:Vitamin B Complex