Visual impairment and blindness in a population-based study of Mashhad, Iran.

LATEST ARTICLES
SEARCH INDEX
SUGGEST ARTICLE
THE OSI COLLECTIONS
ABOUT THE OSI

OSI STATISTICS

Total abstracts indexed:
536
Audio abstracts:
101
Open access articles:
476
Pending review:
115
Annotations added:
2
Countries represented:
91
No. of contributors:
10
Bookmarks made:
12
Specialities covered:
19

Visual impairment and blindness in a population-based study of Mashhad, Iran.


JournalJournal of current ophthalmology
Publication date – Jun – 2018
Authors – Hashemi, H; Khabazkhoob, M; Saatchi, M; Ostadimoghaddam, H; Yekta, A
KeywordsBlindness, Cross-sectional study, Low-vision, Middle-East, Visual impairment
Open access – Yes
SpecialityOphthalmology
World region Eastern Asia
Country: Iran
Language – English
Submitted to the One Surgery Index on July 21, 2018 at 12:00 am
Abstract:

Purpose
To determine the prevalence of visual impairment and blindness and related factors in the 1- to 90-year-old urban population of Mashhad.

Methods
In this cross-sectional study of 1- to 90-year-old residents of Mashhad, in northeastern Iran, sampling was done through random stratified cluster sampling (120 clusters). After selecting the samples and their participation in the study, all subjects had vision testing including measurement of visual acuity and refraction, as well as examinations with the slit-lamp and ophthalmoscopy. Visual impairment (primary outcomes) was defined as a visual acuity worse than of 0.5 logMAR (20/60) in the better eye.

Results
Of the 4453 selected persons, 3132 (70.4%) participated in the study. The prevalence of visual impairment based on presenting vision and best-corrected vision was 3.95% (95% confidence interval [CI]: 3.13–4.77) and 2.23 (95% CI: 1.54–2.91), respectively. The prevalence of presenting visual impairment increased from 1.59% in children under 5 years of age to 43.59% in people older than 65 years of age; these figures were respectively 1.59% and 42.31% based on corrected visual acuity. In the logistic regression model, older age (OR = 1.06, 95% CI: 1.04–1.07, P < 0.001), higher education (OR = 0.16, 95% CI: 0.06–0.38, P < 0.001), and low income (OR = 1.36, 95% CI: 1.21–1.72, P < 0.001) correlated with impaired sight. Based on presenting vision and best-corrected vision, the prevalence of blindness was 0.86% (95% CI: 0.51–1.22) and 0.32% (95% CI: 0.1–0.55). The most common causes of visual impairment were uncorrected refractive error (41.8%) and cataract (20%).

Conclusions
According to our findings, the prevalence of visual impairment was intermediate in comparison with other studies. The prevalence of visual impairment in our study was similar to the global average; however, it was markedly high at older ages. Nonetheless, refractive errors and cataracts remain as the main causes of impaired vision and blindness in this population, while these two conditions are easily treatable with correction or surgery.

OSI Number – 10149
PMID – 29988920

Public annotations on this article:
No public annotations yet