Can the prevalence of open-angle glaucoma be estimated from a retrospective clinical material? A study on the west coast of Iceland
Article first published online: 29 JUL 2005
Acta Ophthalmologica Scandinavica
Volume 83, Issue 5, pages 549–553, October 2005
How to Cite
Jóhannesson, G., Guðmundsdóttir, G. J. and Lindén, C. (2005), Can the prevalence of open-angle glaucoma be estimated from a retrospective clinical material? A study on the west coast of Iceland. Acta Ophthalmologica Scandinavica, 83: 549–553. doi: 10.1111/j.1600-0420.2005.00514.x
- Issue published online: 29 JUL 2005
- Article first published online: 29 JUL 2005
- Received on December 30th, 2004. Accepted on May 8th, 2005.
Vol. 89, Issue 3, e299, Article first published online: 16 MAR 2011
- open-angle glaucoma;
Purpose: To explore the possibility of estimating the prevalence of open-angle glaucoma (OAG) on the west coast of Iceland using a clinical retrospective material, and to compare that estimate with the results from a recent prospective Icelandic study.
Methods: The compulsory ophthalmological examination for the prescription of eye glasses in combination with information obtained from Statistics Iceland were used to establish the prevalence of glaucoma in Akranes and to estimate the minimum prevalence for the greater west coast area. A recent prospective study from Iceland was used as reference.
Results: In all, 79% of 1443 Akranes inhabitants aged 50 years or more had visited the eye clinic at least once between 1996 and 2001. The prevalence of OAG was 4.8% (95% CI 3.6–6.1). The minimum prevalence for the west coast was 3.8% (95% CI 3.2–4.4). The prevalence increased with age (p < 0.001). The overall prevalence was similar to that of recently published prospective data but the prevalence of normal tension glaucoma (NTG) was lower.
Conclusion: The results from the two studies are similar in many respects, which indicates that retrospective data may supply meaningful information on glaucoma prevalence. Important sources of error are the selection and attendance of patients, screening methods and diagnostic criteria. If routine examination does not include fundus photography and/or perimetry, the prevalence of NTG will be underestimated.