Accommodation "error" and retinal image quality
Aim: A modified wavefront sensor was used to investigate the effect of accommodative errors on retinal image quality. Methods: Ten subjects were presented with six vergence stimuli between 0.17 D and 5.00 D. For each vergence distance, subjective visual acuity and ocular wavefronts were measured. Wavefronts were analysed for natural pupil sizes and for a fixed threemillimetre pupil diameter. Visual Strehl ratios computed in the frequency domain (VSOTF) and retinal images were calculated for each condition. Results: Subjective visual acuity was significantly improved at intermediate vergence distances (1.00 D and 2.00 D; p < 0.01), and decreased significantly at 5.00 D compared with 0.17 D (p < 0.05). VSOTF magnitude was associated with subjective visual acuity and VSOTF peak location correlated with accommodation error. Apparent accommodative errors due to spherical aberration were highly correlated with accommodative lead and lag for natural pupils (R2 = 0.80) and accounted for 93 per cent of the total accommodative error. Conclusions: The combination of higher-order aberrations and accommodative errors improved retinal image quality compared with accommodative errors or higher order aberrations alone. The one to one stimulus/response slope should not be considered as ideal in the presence of higher-order aberrations. Pupil size and higher order aberrations play an important role in ASR.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal's website (see hypertext link) or contact the author.|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
|Divisions:||Current > Research Centres > Centre for Health Research|
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2006 Blackwell Publishing|
|Copyright Statement:||The definitive version is available at www.blackwell-synergy.com|
|Deposited On:||18 Jan 2008|
|Last Modified:||22 Apr 2010 02:23|
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