title: Twenty-four hour pattern of intraocular pressure and ocular perfusion pressure in night shift workers.
abstract: OBJECTIVE
  To investigate the intraocular pressure (IOP) and ocular perfusion pressure (OPP) in night shift workers.
  
  
  METHODS
  Seventy-one healthy individuals who work the night shift were evaluated. IOP and OPP were measured in the sitting position in each participant. Measurements were obtained at rest time (09:00, 12:00, 16:00) and night-shift time (20:00, 24:00, 04:00, 08:00).
  
  
  RESULTS
  The mean age of the 33 females and 38 males was 35.6 ± 7.5 years (range 20-53 years). Mean IOP values were different between the measurements at 9:00 and 12:00 (p = 0.00), at 9:00 and 16:00 (p = 0.00), at 12:00 and 16:00 (p = 0.00), at 16:00 and 24:00 (p = 0.02), at 24:00 and 04:00 (p = 0.02), and at 24:00 and 08:00 (p = 0.00). Mean OPP values were significantly different only between the measurements at 9:00 and 20:00 (p = 0.01).
  
  
  CONCLUSIONS
  This study revealed that IOP and OPP in night shift workers show 24-hour variations.
authors.affiliation: Kanuni Sultan Suleyman Education and Research Hospital, Department of Ophthalmology , Istanbul , Turkey and.
authors.forename: Necip
authors.initials: N
authors.lastname: Kara
authors.forename: Tolga
authors.initials: T
authors.lastname: Yilmaz
mesh_terms: D000328:Adult; D062186:Arterial Pressure / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D010561:Personnel Staffing and Scheduling; D011446:Prospective Studies; D014065:Tonometry, Ocular; D014792:Visual Acuity / Q000502:physiology; D014794:Visual Fields / Q000502:physiology; D014937:Work / Q000502:physiology*; D055815:Young Adult
keywords: Circadian rhythm; glaucoma; intraocular pressure; night shift workers; ocular perfusion pressure