Abstract

A system to measure the topography of the first optical surface of the human eye noninvasively by using a curvature sensor is described. The static corneal topography and the dynamic topography of the tear film can both be measured, and the topographies obtained are presented. The system makes possible the study of the dynamic aberrations introduced by the tear film to determine their contribution to the overall ocular aberrations in healthy eyes, eyes with corneal pathologies, and eyes wearing contact lenses.

© 2005 Optical Society of America

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References

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  1. H. Hofer, P. Artal, B. Singer, J. L. Aragón, and D. R. Williams, J. Opt. Soc. Am. A 18, 497 (2001).
    [CrossRef]
  2. A. Dubra, C. Paterson, and C. Dainty, Opt. Express 12, 6278 (2004).
    [CrossRef] [PubMed]
  3. L. Koechlin, “Topographie cornéenne par mesure de front d’onde,” presented at Journées SF2A “ASHRA,” Bordeaux, France, June 15–20, 2003.
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]

2004 (1)

2001 (1)

1991 (1)

1990 (1)

1988 (1)

Aragón, J. L.

Artal, P.

Dainty, C.

Dubra, A.

Hofer, H.

Ichikawa, K.

Koechlin, L.

L. Koechlin, “Topographie cornéenne par mesure de front d’onde,” presented at Journées SF2A “ASHRA,” Bordeaux, France, June 15–20, 2003.

Lohmann, A. W.

Paterson, C.

Roddier, C.

Roddier, F.

Singer, B.

Takeda, M.

Williams, D. R.

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Figures (4)

Fig. 1
Fig. 1

Schematic diagram of the optical system.

Fig. 2
Fig. 2

Corneal topography of an astigmatic eye represented in terms of radial curvature.

Fig. 3
Fig. 3

Individual frames from different series showing the tear film topography after removal of first- and second-order Zernike terms: (a) tear film at the start of a blink (grayscale range 9 μ m ); (b) a bubble on the tear film (bottom right; grayscale range 0.3 μ m .)

Fig. 4
Fig. 4

Root mean square error evolution of the wavefront transmitted through the tear film over 10 s series. (a) The subject blinked three times during the series acquisition. (b) The subject refrained from blinking.

Equations (4)

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I 1 = I 0 + I z Δ z ,
I 2 = I 0 I z Δ z ,
I z = I W I 2 W ,
S = I 1 I 2 I 1 + I 2 = ( W n δ c P 2 W ) Δ z .

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