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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

Comparison of the radial variances V. The units are in arcmin2. The original radial variance maps contain one value for each lenslet forming maps of 15x15 blocks. We bilinearly interpolated the original images so that the patterns are more readily readable. The spot images g for the whole eye were acquired by a laboratory aberrometer with the wavelength 633 nm. We use the zonal wavefront for the macro-aberrations. The predicted spot images h0 for the resolved aberrations are obtained with the SH simulation program (section 3.3). The radial variances for the simulated SH images for the baseline data are close to the DL case. (a) V(g) for the base line data, (b) V(g) for the TBU data, (c) V(h0) for the base line data, (d) V(h0) for the TBU data.
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g009: Comparison of the radial variances V. The units are in arcmin2. The original radial variance maps contain one value for each lenslet forming maps of 15x15 blocks. We bilinearly interpolated the original images so that the patterns are more readily readable. The spot images g for the whole eye were acquired by a laboratory aberrometer with the wavelength 633 nm. We use the zonal wavefront for the macro-aberrations. The predicted spot images h0 for the resolved aberrations are obtained with the SH simulation program (section 3.3). The radial variances for the simulated SH images for the baseline data are close to the DL case. (a) V(g) for the base line data, (b) V(g) for the TBU data, (c) V(h0) for the base line data, (d) V(h0) for the TBU data.

Mentions: The radial variance maps of these double pass images are shown in Fig. 9(a)Fig. 9


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)

Comparison of the radial variances V. The units are in arcmin2. The original radial variance maps contain one value for each lenslet forming maps of 15x15 blocks. We bilinearly interpolated the original images so that the patterns are more readily readable. The spot images g for the whole eye were acquired by a laboratory aberrometer with the wavelength 633 nm. We use the zonal wavefront for the macro-aberrations. The predicted spot images h0 for the resolved aberrations are obtained with the SH simulation program (section 3.3). The radial variances for the simulated SH images for the baseline data are close to the DL case. (a) V(g) for the base line data, (b) V(g) for the TBU data, (c) V(h0) for the base line data, (d) V(h0) for the TBU data.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

g009: Comparison of the radial variances V. The units are in arcmin2. The original radial variance maps contain one value for each lenslet forming maps of 15x15 blocks. We bilinearly interpolated the original images so that the patterns are more readily readable. The spot images g for the whole eye were acquired by a laboratory aberrometer with the wavelength 633 nm. We use the zonal wavefront for the macro-aberrations. The predicted spot images h0 for the resolved aberrations are obtained with the SH simulation program (section 3.3). The radial variances for the simulated SH images for the baseline data are close to the DL case. (a) V(g) for the base line data, (b) V(g) for the TBU data, (c) V(h0) for the base line data, (d) V(h0) for the TBU data.
Mentions: The radial variance maps of these double pass images are shown in Fig. 9(a)Fig. 9

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