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Baskar Theagarayan, Yelene Sorman; Effect of Age on Amplitude of Accommodation in a Swedish Population. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):6012.
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© ARVO (1962-2015); The Authors (2016-present)
The purpose of this study was to determine the relationship between age and amplitude of accommodation in a Swedish population and also to investigate the age of onset of Presbyopia in this population.
All the measurements were performed in a Eye Clinic in Sweden. Subjects living in and around southern part of Sweden were recruited for this study. All the subjects had at least 20/20 best corrected visual acuity and normal binocular vision. The sample size was 103 subjects aged between 9 and 68 years. The amplitude of accommodation was measured using the push-up and the push-down method with a Royal Air Force (RAF) ruler. The ruler has both a metric scale in centimeters and a dioptric scale. The subjects were asked to read letters of N5 print size and report first sustained blur in push-up method and first sustained clear in push-down method. The subjects had their best correction in place during the measurements. All the measurements were done both monocularly (Right eye-OD and Left eye-OS) and binocularly (OU).
Regression analysis showed a significant decrease in the amplitude of accommodation with age (p < 0.05). Age of onset of presbyopia (less than 5 D amplitude) was 39 and 41 years based on monocular and binocular values respectively in this sample. There was no significant difference in the amplitude values between OD and OS (p > 0.05). Binocular amplitude values were higher than monocular values. There was a significant difference between push-up and push-down values (p < 0.05). Compared to Hofstetter's results, this study showed lower values than expected.
Amplitude of accommodation decreased with age as suggested by previous studies. At the age of 54 years, the amplitude reached around 0.85 D and remained constant after that. Age of onset of presbyopia in this Swedish population was similar to other European population.
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