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Forward light scatter analysis of the eye in a spatially-resolved double-pass optical system.

Nam J, Thibos LN, Bradley A, Himebaugh N, Liu H - Opt Express (2011)

Bottom Line: An optical analysis is developed to separate forward light scatter of the human eye from the conventional wavefront aberrations in a double pass optical system.We prove an additivity property for radial variance that allows us to distinguish between spot blurs from macro-aberrations and micro-aberrations.When the method is applied to tear break-up in the human eye, we find that micro-aberrations in the second pass accounts for about 87% of the double pass image blur in the Shack-Hartmann wavefront aberrometer under our experimental conditions.

View Article: PubMed Central - PubMed

Affiliation: School of Optometry, Indiana University, 800 Atwater Avenue, Bloomington, Indiana 47405, USA. jnam@indiana.edu

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Related in: MedlinePlus

The average radial variance maps for the light scatter for the second pass only based on Eq. (15). (a)  for the baseline data. The confidence interval U−L is uniform across the pupil and is 63.3 arcmin2. (b)  for the TBU data. The confidence interval U−L is 75.06 arcmin2. The radial variances for the spot images for the TBU data are larger than those for the baseline data (e.g. Max = 130.4 arcmin2 for (a) and 175.3arcmin2 for (b)). For the baseline data, although the raw spot images in Fig. 7(a) appear to be well focused, as Fig. 10(a) indicates, there still remains light scatter that has not been resolved by the aberrometer.
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g010: The average radial variance maps for the light scatter for the second pass only based on Eq. (15). (a) for the baseline data. The confidence interval U−L is uniform across the pupil and is 63.3 arcmin2. (b) for the TBU data. The confidence interval U−L is 75.06 arcmin2. The radial variances for the spot images for the TBU data are larger than those for the baseline data (e.g. Max = 130.4 arcmin2 for (a) and 175.3arcmin2 for (b)). For the baseline data, although the raw spot images in Fig. 7(a) appear to be well focused, as Fig. 10(a) indicates, there still remains light scatter that has not been resolved by the aberrometer.

Mentions: The values of the radial variance maps for the micro-aberrations are, on average, always larger in the TBU data than in the baseline data (Fig. 10Fig. 10


Forward light scatter analysis of the eye in a spatially-resolved double-pass optical system.

Nam J, Thibos LN, Bradley A, Himebaugh N, Liu H - Opt Express (2011)

The average radial variance maps for the light scatter for the second pass only based on Eq. (15). (a)  for the baseline data. The confidence interval U−L is uniform across the pupil and is 63.3 arcmin2. (b)  for the TBU data. The confidence interval U−L is 75.06 arcmin2. The radial variances for the spot images for the TBU data are larger than those for the baseline data (e.g. Max = 130.4 arcmin2 for (a) and 175.3arcmin2 for (b)). For the baseline data, although the raw spot images in Fig. 7(a) appear to be well focused, as Fig. 10(a) indicates, there still remains light scatter that has not been resolved by the aberrometer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3368325&req=5

g010: The average radial variance maps for the light scatter for the second pass only based on Eq. (15). (a) for the baseline data. The confidence interval U−L is uniform across the pupil and is 63.3 arcmin2. (b) for the TBU data. The confidence interval U−L is 75.06 arcmin2. The radial variances for the spot images for the TBU data are larger than those for the baseline data (e.g. Max = 130.4 arcmin2 for (a) and 175.3arcmin2 for (b)). For the baseline data, although the raw spot images in Fig. 7(a) appear to be well focused, as Fig. 10(a) indicates, there still remains light scatter that has not been resolved by the aberrometer.
Mentions: The values of the radial variance maps for the micro-aberrations are, on average, always larger in the TBU data than in the baseline data (Fig. 10Fig. 10

Bottom Line: An optical analysis is developed to separate forward light scatter of the human eye from the conventional wavefront aberrations in a double pass optical system.We prove an additivity property for radial variance that allows us to distinguish between spot blurs from macro-aberrations and micro-aberrations.When the method is applied to tear break-up in the human eye, we find that micro-aberrations in the second pass accounts for about 87% of the double pass image blur in the Shack-Hartmann wavefront aberrometer under our experimental conditions.

View Article: PubMed Central - PubMed

Affiliation: School of Optometry, Indiana University, 800 Atwater Avenue, Bloomington, Indiana 47405, USA. jnam@indiana.edu

Show MeSH
Related in: MedlinePlus