title: [Characteristics of cup/disc ratios in a population of northern Togo aged 20-40 years].
abstract: OBJECTIVE
  To describe the characteristics of cup/disc ratio in a young population belonging to a homogenous ethnic group in northern Togo.
  
  
  METHODS
  The study population comprising 1010 persons (550 men and 460 women aged 20-40 years) was selected in 12 villages in the Doufelgou area. Eye assessment was conducted in the local health center facilities using a visual acuity chart, an ophthalmoscope, and light magnification for exploration of the anterior segment.
  
  
  RESULTS
  The mean age of the participants was 30.4 years. The mean cup/disc ratio was 0.36 (range, 0.3-0.9). The most frequently found cup/disc ratio was 0.3, in both eyes, and was predominant in the 20- to 24-year age group: 56.6% of the right eyes and 58.7% of the left eyes. Cup/disc ratios over 0.5 were found in 14.4% of the right eyes and 12.4% of the left eyes; a cut-off point over 0.7 gave an abnormal cup/disc ratio prevalence of 3.2% in the right eye and 3.5% in the left eye. In 75% of the cases, the cupping appeared round and was elliptic in 25% of the patients. The cupping position was central in 63%, temporal in 18.3%, and nasal in 18.7% of the cases. In 7.8%, cupping was asymmetric.
  
  
  CONCLUSIONS
  More than 3% of the young population of northern Togo has a 0.7 or higher cup/disc ratio, which shows a high prevalence of primary open-angle glaucoma if cup/disc ratio is considered a criterion for definition.
authors.affiliation: Service d'ophtalmologie, CHU Tokoin, 08 BP 8986, Lomé, Togo. didier23@yahoo.fr
authors.forename: K D
authors.initials: KD
authors.lastname: Ayena
authors.forename: A D R
authors.initials: AD
authors.lastname: Agbo
authors.forename: A B M
authors.initials: AB
authors.lastname: Attaya
authors.forename: A P
authors.initials: AP
authors.lastname: Djagnikpo
authors.forename: G M
authors.initials: GM
authors.lastname: Kondi
authors.forename: K B
authors.initials: KB
authors.lastname: Dzidzinyo
authors.forename: K M
authors.initials: KM
authors.lastname: Amedome
authors.forename: K B
authors.initials: KB
authors.lastname: Nononsaa
authors.forename: M
authors.initials: M
authors.lastname: Banla
authors.forename: K P
authors.initials: KP
authors.lastname: Balo
mesh_terms: D000328:Adult; D017677:Age Distribution; D001766:Blindness / Q000453:epidemiology / Q000209:etiology; D005260:Female; D005902:Glaucoma, Open-Angle / Q000150:complications / Q000175:diagnosis* / Q000208:ethnology*; D006801:Humans; D008297:Male; D009887:Ophthalmoscopy; D009898:Optic Disk / Q000473:pathology*; D011159:Population Surveillance; D015995:Prevalence; D012307:Risk Factors; D012424:Rural Population / Q000706:statistics & numerical data; D017678:Sex Distribution; D014037:Togo / Q000453:epidemiology; D015351:Vision Screening; D014792:Visual Acuity