title: Central corneal thickness in the Ocular Hypertension Treatment Study (OHTS).
abstract: OBJECTIVE
  Central corneal thickness influences intraocular pressure (IOP) measurement. We examined the central corneal thickness of subjects in the Ocular Hypertension Treatment Study (OHTS) and determined if central corneal thickness is related to race.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  One thousand three hundred one OHTS subjects with central corneal thickness measurements.
  
  
  METHODS
  Central corneal thickness was determined with ultrasonic pachymeters of the same make and model at all clinical sites of the OHTS.
  
  
  METHODS
  Correlation of mean central corneal thickness with race, baseline IOP, refraction, age, gender, systemic hypertension, and diabetes.
  
  
  RESULTS
  Mean central corneal thickness was 573.0 +/- 39.0 microm. Twenty-four percent of the OHTS subjects had central corneal thickness > 600 microm. Mean central corneal thickness for African American subjects (555.7 +/- 40.0 microm; n = 318) was 23 microm thinner than for white subjects (579.0 +/- 37.0 microm; P < 0.0001). Other factors associated with greater mean central corneal thickness were younger age, female gender, and diabetes.
  
  
  CONCLUSIONS
  OHTS subjects have thicker corneas than the general population. African American subjects have thinner corneas than white subjects in the study. The effect of central corneal thickness may influence the accuracy of applanation tonometry in the diagnosis, screening, and management of patients with glaucoma and ocular hypertension.
authors.affiliation: Department of Ophthalmology, University of California-Davis, Sacramento, California, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Brandt
authors.forename: J A
authors.initials: JA
authors.lastname: Beiser
authors.forename: M A
authors.initials: MA
authors.lastname: Kass
authors.forename: M O
authors.initials: MO
authors.lastname: Gordon
mesh_terms: D000328:Adult; D017677:Age Distribution; D000367:Age Factors; D000368:Aged; D000959:Antihypertensive Agents / Q000627:therapeutic use; D003315:Cornea / Q000473:pathology*; D003430:Cross-Sectional Studies; D005006:Ethnicity; D005260:Female; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis* / Q000208:ethnology / Q000628:therapy; D011446:Prospective Studies; D012737:Sex Factors; D014065:Tonometry, Ocular
chemical_list: D000959:Antihypertensive Agents