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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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Schematic diagram of an aberrated eye viewing (a) without a random screen, (b) through a random screen and sample spot images. Ocular sources of scatter are modeled by a thin random screen in the plane of the eye’s pupil. The lenslet arrays are colored in orange. Courtesy of John. R. Hoffman (Lockheed Martin) during the workshop at Institute for Mathematics and Its Applications (IMA) at University of Minnesota.
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g002: Schematic diagram of an aberrated eye viewing (a) without a random screen, (b) through a random screen and sample spot images. Ocular sources of scatter are modeled by a thin random screen in the plane of the eye’s pupil. The lenslet arrays are colored in orange. Courtesy of John. R. Hoffman (Lockheed Martin) during the workshop at Institute for Mathematics and Its Applications (IMA) at University of Minnesota.

Mentions: To measure micro-aberrations with a SHWFS, we envision fine ripples riding on the waves of macro-aberrations (Fig. 2Fig. 2


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)

Schematic diagram of an aberrated eye viewing (a) without a random screen, (b) through a random screen and sample spot images. Ocular sources of scatter are modeled by a thin random screen in the plane of the eye’s pupil. The lenslet arrays are colored in orange. Courtesy of John. R. Hoffman (Lockheed Martin) during the workshop at Institute for Mathematics and Its Applications (IMA) at University of Minnesota.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

g002: Schematic diagram of an aberrated eye viewing (a) without a random screen, (b) through a random screen and sample spot images. Ocular sources of scatter are modeled by a thin random screen in the plane of the eye’s pupil. The lenslet arrays are colored in orange. Courtesy of John. R. Hoffman (Lockheed Martin) during the workshop at Institute for Mathematics and Its Applications (IMA) at University of Minnesota.
Mentions: To measure micro-aberrations with a SHWFS, we envision fine ripples riding on the waves of macro-aberrations (Fig. 2Fig. 2

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