title: Early Manifest Glaucoma Trial: design and baseline data.
abstract: OBJECTIVE
  The Early Manifest Glaucoma Trial (EMGT) will evaluate the effectiveness of reducing intraocular pressure (IOP) in early, previously untreated open-angle glaucoma. Its secondary aims are to explore factors related to glaucoma progression and to study the natural history of the disease. This article describes the EMGT design and presents baseline data.
  
  
  METHODS
  Randomized, clinical trial.
  
  
  METHODS
  Newly diagnosed patients 50 to 80 years of age with early glaucomatous visual field defects were mainly identified from a population-based screening of more than 44,000 residents of Malmö and Helsingborg, Sweden. Exclusion criteria were advanced visual field loss; mean IOP greater than 30 mmHg or any IOP greater than 35 mmHg; visual acuity less than 0.5; and inability to complete follow-up protocols.
  
  
  METHODS
  After informed consent, patients were randomized to treatment or no initial treatment with close follow-up. Treated patients had laser trabeculoplasty and started receiving topical betaxolol twice daily in eligible eyes. Follow-up visits include computerized perimetry and tonometry every 3 months and fundus photography every 6 months. Decisions to change or begin treatment are made jointly with the patient when EMGT progression occurs and also later if clinically needed.
  
  
  METHODS
  The EMGT progression is defined by sustained increases of visual field loss in three consecutive C30-2 Humphrey tests, as determined from computer-based analyses, or by optic disc changes, as determined from flicker chronoscopy and side-by-side comparisons of fundus photographs performed by masked, independent graders.
  
  
  RESULTS
  A total of 255 patients were randomized between 1993 and 1997 and will be followed for at least 4 years. All had generally good health status; mean age was 68.1 years, and 66% were women. At baseline, mean IOP was 20.6 mmHg and 80% of eyes had IOP less than 25 mmHg.
  
  
  CONCLUSIONS
  The Early Manifest Glaucoma Trial is the first large randomized, clinical trial to evaluate the role of immediate pressure reduction, as compared to no initial reduction, in patients with early glaucoma and normal or moderately elevated IOP. Its results will have implications for: (1) the clinical management of glaucoma; (2) understanding the role of IOP and the natural history of glaucoma; and (3) evaluating the rationale for glaucoma screening.
authors.affiliation: Department of Preventive Medicine, University Medical Center at Stony Brook, New York 11794-8036, USA. cleske@uhmc.sunysb.edu
authors.forename: M C
authors.initials: MC
authors.lastname: Leske
authors.forename: A
authors.initials: A
authors.lastname: Heijl
authors.forename: L
authors.initials: L
authors.lastname: Hyman
authors.forename: B
authors.initials: B
authors.lastname: Bengtsson
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D000368:Aged; D000369:Aged, 80 and over; D015784:Betaxolol / Q000627:therapeutic use*; D018450:Disease Progression; D005260:Female; D005902:Glaucoma, Open-Angle / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects*; D008297:Male; D008875:Middle Aged; D012107:Research Design; D014065:Tonometry, Ocular; D014130:Trabeculectomy; D014786:Vision Disorders / Q000503:physiopathology; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields
chemical_list: D000319:Adrenergic beta-Antagonists; D015784:Betaxolol