[Characteristics of cup/disc ratios in a population of northern Togo aged 20-40 years].
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.
Ayena
K D
KD
Service d'ophtalmologie, CHU Tokoin, 08 BP 8986, Lomé, Togo. didier23@yahoo.fr
Agbo
A D R
AD
Attaya
A B M
AB
Djagnikpo
A P
AP
Kondi
G M
GM
Dzidzinyo
K B
KB
Amedome
K M
KM
Nononsaa
K B
KB
Banla
M
M
Balo
K P
KP
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