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Post-cycloplegia myopic shift in an older population
Tze'Yo Toh1, Lisa S Kearns, Lindsey W Scotter
1The Eye Hospital, Launceston, Australia.
Ophthalmic Epidemiology
|July 23, 2005
Summary
Cycloplegic eye exams in older adults cause a myopic shift, potentially overestimating myopia prevalence. This finding is crucial for comparing refractive error studies using different autorefraction methods.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Accurate refractive error assessment is vital for understanding vision health.
- Presbyopia, age-related farsightedness, affects a significant portion of the adult population.
- Autorefraction is a common tool for objective refractive error measurement.
Purpose of the Study:
- To determine if mydriatic agents, used to dilate pupils, confound autorefraction results in presbyopic individuals.
- To investigate the impact of cycloplegic refraction on objective refractive measurements in the elderly.
Main Methods:
- 37 subjects over 50 years old underwent pre- and post-cycloplegic autorefraction.
- Measurements were taken using a Humphrey-598 autorefractor.
- Multivariate regression analysis was applied to the results from both eyes.
Main Results:
- A mean myopic shift was observed across different refractive groups after cycloplegia.
- Significant myopic shifts were noted in hyperopic (-0.53 D), pseudophakic (-0.49 D), and emmetropic (-0.35 D) eyes (p < 0.001).
- A trend towards a myopic shift was seen in myopic eyes (-0.38 D, p = 0.077).
Conclusions:
- Cycloplegic autorefraction in presbyopic populations induces a myopic shift.
- This shift may lead to an overestimation of myopia prevalence.
- Results highlight the importance of considering cycloplegic status when comparing population-based refractive error studies.