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Wavefront aberration changes caused by a gradient of increasing accommodation stimuli.
1Department of Ophthalmology, Eye & ENT Hospital, Fudan University, Shanghai, China.
Eye (London, England)
|October 25, 2014
Summary
Wavefront aberrations in the human eye change with increased accommodation. Higher-order aberrations significantly increased at 4-6D accommodation, supporting accommodation theories.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Accommodation is the eye's ability to change focus.
- Understanding how accommodation affects optical quality is crucial for vision science.
Purpose of the Study:
- To investigate changes in human eye wavefront aberrations under increasing accommodation stimuli.
- To analyze the impact of accommodation on higher-order aberrations and Zernike coefficients.
Main Methods:
- Prospective study involving 22 healthy volunteers (18-28 years old) with emmetropia or mild myopia.
- Wavefront aberrations were measured using a psychophysical aberrometer under varying accommodation stimuli (1-6D).
- Root mean square (RMS) values of total and higher-order aberrations were calculated and compared.
Main Results:
- Induced accommodation ranged from 0.848D to 5.085D for 1-6D stimuli.
- Higher-order aberrations significantly increased at 4-6D accommodation compared to relaxed accommodation.
- Zernike coefficients showed a significant decrease with increasing accommodation levels.
Conclusions:
- Accommodation significantly alters higher-order wavefront aberrations in the human eye.
- The observed changes support existing theories of accommodation, such as Schachar's theory.
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