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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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The error of the additive rule of the radial variances with respect to the camera resolution. The error was calculated as the difference V(image) – V(object) – V(PSF). As the camera resolution decreases, the relative errors of the additive rule increase from less than 2% to above 16%. Note that the error was calculated relative to V(image). Since V(image) = V(object) + V(PSF), the error relative to V(object) or V(PSF) will be 2 times large as the current error curve.
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g006: The error of the additive rule of the radial variances with respect to the camera resolution. The error was calculated as the difference V(image) – V(object) – V(PSF). As the camera resolution decreases, the relative errors of the additive rule increase from less than 2% to above 16%. Note that the error was calculated relative to V(image). Since V(image) = V(object) + V(PSF), the error relative to V(object) or V(PSF) will be 2 times large as the current error curve.

Mentions: For the simulations shown in Table 1, we assumed that the angular resolution of the detector of spot images cast by individual lenslets is 0.11 arcmin per pixel. For example, if the focal length of the lenslet is 24 mm, this angular resolution is equivalent to a linear resolution of 0.76 micron per pixel. Figure 6Fig. 6


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 error of the additive rule of the radial variances with respect to the camera resolution. The error was calculated as the difference V(image) – V(object) – V(PSF). As the camera resolution decreases, the relative errors of the additive rule increase from less than 2% to above 16%. Note that the error was calculated relative to V(image). Since V(image) = V(object) + V(PSF), the error relative to V(object) or V(PSF) will be 2 times large as the current error curve.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

g006: The error of the additive rule of the radial variances with respect to the camera resolution. The error was calculated as the difference V(image) – V(object) – V(PSF). As the camera resolution decreases, the relative errors of the additive rule increase from less than 2% to above 16%. Note that the error was calculated relative to V(image). Since V(image) = V(object) + V(PSF), the error relative to V(object) or V(PSF) will be 2 times large as the current error curve.
Mentions: For the simulations shown in Table 1, we assumed that the angular resolution of the detector of spot images cast by individual lenslets is 0.11 arcmin per pixel. For example, if the focal length of the lenslet is 24 mm, this angular resolution is equivalent to a linear resolution of 0.76 micron per pixel. Figure 6Fig. 6

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