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Design and validation of a scanning Shack Hartmann aberrometer for measurements of the eye over a wide field of view.

Wei X, Thibos L - Opt Express (2010)

Bottom Line: The prototype SSHA successfully measured the off-axis wavefront aberrations over +/- 15 degree visual field within 7 seconds.In two validation experiments with a wide angle model eye, it measured change in defocus aberration accurately (<0.02microm, 4mm pupil) and precisely (<0.03microm, 4mm pupil).A preliminary experiment with a human subject suggests its feasibility in clinical applications.

View Article: PubMed Central - PubMed

Affiliation: School of Optometry, Indiana University, Bloomington, Indiana 47405, USA. weix@indiana.edu

ABSTRACT
Peripheral vision and off-axis aberrations not only play an important role in daily visual tasks but may also influence eye growth and refractive development. Thus it is important to measure off-axis wavefront aberrations of human eyes objectively. To achieve efficient measurement, we incorporated a double-pass scanning system with a Shack Hartmann wavefront sensor (SHWS) to develop a scanning Shack Hartmann aberrometer (SSHA). The prototype SSHA successfully measured the off-axis wavefront aberrations over +/- 15 degree visual field within 7 seconds. In two validation experiments with a wide angle model eye, it measured change in defocus aberration accurately (<0.02microm, 4mm pupil) and precisely (<0.03microm, 4mm pupil). A preliminary experiment with a human subject suggests its feasibility in clinical applications.

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Scanning Shack Hartmann aberrometer (SSHA) apparatus. BS1-3, beam splitters; DPS1-4, Double pass scanning lenses; L5-9, Lenses; SHWS, Shack Hartmann Wavefront sensor; Aperture A1, limiting aperture.
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g001: Scanning Shack Hartmann aberrometer (SSHA) apparatus. BS1-3, beam splitters; DPS1-4, Double pass scanning lenses; L5-9, Lenses; SHWS, Shack Hartmann Wavefront sensor; Aperture A1, limiting aperture.

Mentions: The schematic diagram of the apparatus is shown in Fig. 1Fig. 1


Design and validation of a scanning Shack Hartmann aberrometer for measurements of the eye over a wide field of view.

Wei X, Thibos L - Opt Express (2010)

Scanning Shack Hartmann aberrometer (SSHA) apparatus. BS1-3, beam splitters; DPS1-4, Double pass scanning lenses; L5-9, Lenses; SHWS, Shack Hartmann Wavefront sensor; Aperture A1, limiting aperture.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3369549&req=5

g001: Scanning Shack Hartmann aberrometer (SSHA) apparatus. BS1-3, beam splitters; DPS1-4, Double pass scanning lenses; L5-9, Lenses; SHWS, Shack Hartmann Wavefront sensor; Aperture A1, limiting aperture.
Mentions: The schematic diagram of the apparatus is shown in Fig. 1Fig. 1

Bottom Line: The prototype SSHA successfully measured the off-axis wavefront aberrations over +/- 15 degree visual field within 7 seconds.In two validation experiments with a wide angle model eye, it measured change in defocus aberration accurately (<0.02microm, 4mm pupil) and precisely (<0.03microm, 4mm pupil).A preliminary experiment with a human subject suggests its feasibility in clinical applications.

View Article: PubMed Central - PubMed

Affiliation: School of Optometry, Indiana University, Bloomington, Indiana 47405, USA. weix@indiana.edu

ABSTRACT
Peripheral vision and off-axis aberrations not only play an important role in daily visual tasks but may also influence eye growth and refractive development. Thus it is important to measure off-axis wavefront aberrations of human eyes objectively. To achieve efficient measurement, we incorporated a double-pass scanning system with a Shack Hartmann wavefront sensor (SHWS) to develop a scanning Shack Hartmann aberrometer (SSHA). The prototype SSHA successfully measured the off-axis wavefront aberrations over +/- 15 degree visual field within 7 seconds. In two validation experiments with a wide angle model eye, it measured change in defocus aberration accurately (<0.02microm, 4mm pupil) and precisely (<0.03microm, 4mm pupil). A preliminary experiment with a human subject suggests its feasibility in clinical applications.

Show MeSH