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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 Zernike coefficients for (a) the baseline data and (b) the TBU data. The colors represent the WFE. The saturation of the colors represents the magnitude of the Zernike aberration coefficients. The TBU data indicate an increase in the amount of HOA. RMS errors for the macro-aberrations were calculated with the modal wavefront: (a) 0.50 micron, (b) 1.97 micron.
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g008: The Zernike coefficients for (a) the baseline data and (b) the TBU data. The colors represent the WFE. The saturation of the colors represents the magnitude of the Zernike aberration coefficients. The TBU data indicate an increase in the amount of HOA. RMS errors for the macro-aberrations were calculated with the modal wavefront: (a) 0.50 micron, (b) 1.97 micron.

Mentions: The raw image of the SH spots encircled with a pupil of radius 3 mm. The diameter of each lenslet is 400 microns in the SH detector. We expect a 15x15 array of the spot images inside the pupil. The ' + ' sign indicates the pupil center, which does not necessarily coincide with a spot in a lenslet. The intensity of the raw images was boosted for the display purpose. (a) the baseline data when the tear film forms a smooth surface (soon after ablink), (b) the SH image after the tear break-up (following blink-suppression).


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 Zernike coefficients for (a) the baseline data and (b) the TBU data. The colors represent the WFE. The saturation of the colors represents the magnitude of the Zernike aberration coefficients. The TBU data indicate an increase in the amount of HOA. RMS errors for the macro-aberrations were calculated with the modal wavefront: (a) 0.50 micron, (b) 1.97 micron.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

g008: The Zernike coefficients for (a) the baseline data and (b) the TBU data. The colors represent the WFE. The saturation of the colors represents the magnitude of the Zernike aberration coefficients. The TBU data indicate an increase in the amount of HOA. RMS errors for the macro-aberrations were calculated with the modal wavefront: (a) 0.50 micron, (b) 1.97 micron.
Mentions: The raw image of the SH spots encircled with a pupil of radius 3 mm. The diameter of each lenslet is 400 microns in the SH detector. We expect a 15x15 array of the spot images inside the pupil. The ' + ' sign indicates the pupil center, which does not necessarily coincide with a spot in a lenslet. The intensity of the raw images was boosted for the display purpose. (a) the baseline data when the tear film forms a smooth surface (soon after ablink), (b) the SH image after the tear break-up (following blink-suppression).

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