Competing/conflicts of interest: No stated conflict of interest.
Population-based study of presbyopia in Shahroud, Iran
Article first published online: 4 JUN 2012
© 2012 The Authors. Clinical and Experimental Ophthalmology © 2012 Royal Australian and New Zealand College of Ophthalmologists
Clinical & Experimental Ophthalmology
Volume 40, Issue 9, pages 863–868, December 2012
How to Cite
Hashemi, H., Khabazkhoob, M., Jafarzadehpur, E., Mehravaran, S., Emamian, M. H., Yekta, A., Shariati, M. and Fotouhi, A. (2012), Population-based study of presbyopia in Shahroud, Iran. Clinical & Experimental Ophthalmology, 40: 863–868. doi: 10.1111/j.1442-9071.2012.02799.x
Funding sources: This project was supported by Noor Ophthalmology Research Center, Shahroud University of Medical Sciences and Tehran University of Medical Sciences.
- Issue published online: 6 DEC 2012
- Article first published online: 4 JUN 2012
- Accepted manuscript online: 19 MAR 2012 09:48AM EST
- Received 29 December 2011; accepted 2 March 2012.
Background: There is limited information regarding the prevalence of presbyopia in different parts of the world. The add power and the prevalence of presbyopia by age and gender in general population of Shahroud, north of Iran, were studied.
Design: Population-based cross-sectional study.
Participants: Using random cluster sampling, 6311 people from the 40- to 64-year-old population of Shahroud were invited. Of the invited population, 5190 individuals (82.2%) participated in the study.
Methods: Presbyopia was defined as the correction of near vision to logMAR 1 (N8 point) with at least 1 D of add power.
Main Outcome Measures: Near visual acuity of participants was evaluated with a logMAR chart at a distance of 40 cm.
Results: Mean add power in the age groups of 40–44, 45–49, 50–54, 55–59 and 60–64 years was 0.65, 1.30, 1.70, 1.87 and 2.08 D, respectively. For each 5-year increase in age, a 0.35 D increase in add power was noted. The prevalence of presbyopia was 58.15% (95% confidence interval: 56.46–59.84). Presbyopia was more prevalent in women (P < 0.001) and increased with ageing more in women than in men (P < 0.001). Furthermore, in the 60–64-year-old age group, 11% of men and 23% of women were not presbyopic.
Conclusions: Compared with other reports, the add power in different age groups was 0.5 D less, and presbyopia was less prevalent. More than 50% of the over 45-year-old individuals were presbyopic and 17% of the over 60 individuals were free of this condition.