Abstract

Successful surgical treatment of ocular astigmatism requires accurate characterization of both magnitude and axis of the astigmatism. Keratometry and topography are clinically widely used for this measurement; however, their analysis is limited to the anterior corneal surface. Unlike these techniques, optical coherence tomography (OCT) offers the advantage of measuring both the anterior and posterior corneal surface contributions. We present a technique to combine the local curvatures of both surfaces into a single pseudosurface suitable for clinical application. Building on prior work in distributed scanning OCT (DSOCT) to remove corrupting patient motion artifacts, we present the results of a pilot patient study where extracted values of clinical corneal astigmatic power magnitude and direction from DSOCT corneal volumes were comparable to standard clinical measures of corneal astigmatism.

© 2013 Optical Society of America

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References

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2012

2011

2010

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

M. Zhao, A. N. Kuo, and J. A. Izatt, Opt. Express 18, 8923 (2010).
[CrossRef]

2006

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

1998

N. E. Norrby, J. Cataract Refract. Surg. 24, 433 (1998).

Alejandre, N.

Ali, S. F.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Atchison, D. A.

D. A. Atchison and G. Smith, Optics of the Human Eye(Butterworth-Heinemann, 2000).

Avila, M.

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

Berendschot, T. T. J. M.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

Chen, A.

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

Chia, N.

Chiu, S. J.

de Brabander, J.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

de Castro, A.

Farsiu, S.

Gambra, E.

Huang, D.

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

Izatt, J. A.

Jenkins, R.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Jimenez-Alfaro, I.

Koch, D. D.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Kuo, A. N.

LaRocca, F.

Li, Y.

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

Marcos, S.

McNabb, R. P.

Norrby, N. E.

N. E. Norrby, J. Cataract Refract. Surg. 24, 433 (1998).

Nuijts, R. M. M. A.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

Ortiz, S.

Pérez-Merino, P.

Shirayama, M.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Siedlecki, D.

Smith, G.

D. A. Atchison and G. Smith, Optics of the Human Eye(Butterworth-Heinemann, 2000).

Stinnett, S. S.

Szkulmowski, M.

Tang, M.

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

Verbakel, F.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

Visser, N.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

Wang, L.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Weikert, M. P.

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

Wojtkowski, M.

Zhao, M.

Biomed. Opt. Express

J. Cataract Refract. Surg.

N. Visser, T. T. J. M. Berendschot, F. Verbakel, J. de Brabander, and R. M. M. A. Nuijts, J. Cataract Refract. Surg. 38, 1764 (2012).
[CrossRef]

D. D. Koch, S. F. Ali, M. P. Weikert, M. Shirayama, R. Jenkins, and L. Wang, J. Cataract Refract. Surg. 38, 2080 (2012).
[CrossRef]

M. Tang, Y. Li, M. Avila, and D. Huang, J. Cataract Refract. Surg. 32, 1843 (2006).
[CrossRef]

M. Tang, A. Chen, Y. Li, and D. Huang, J. Cataract Refract. Surg. 36, 2115 (2010).
[CrossRef]

N. E. Norrby, J. Cataract Refract. Surg. 24, 433 (1998).

Opt. Express

Other

Corneal Topography Systems ANSI Z80.23–2007 (2007).

D. A. Atchison and G. Smith, Optics of the Human Eye(Butterworth-Heinemann, 2000).

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Figures (4)

Fig. 1.
Fig. 1.

Illustration of model surface profile with meridional and axial radii of curvatures at a single point.

Fig. 2.
Fig. 2.

Adaptation of corneal surfaces to a local thick lens equivalent at single point xn; xn is rotated in the bottom image.

Fig. 3.
Fig. 3.

Top: DSOCT MC maps of anterior (L) and posterior (R) corneal surfaces Bottom: Pachymetry map taken normal to anterior surface [4] (L) and multisurface curvature map (R) combining all three as described by Eq. (4).

Fig. 4.
Fig. 4.

AC maps Top: (L) Topography and (R) Scheimpflug photography anterior surface; Outer dashed circles: 5 mm region of interest Bottom: (L) Single-surface and (R) multisurface DSOCT maps over 5 mm zones.

Tables (1)

Tables Icon

Table 1. Mean Clinical Values with Repeatability

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

Km(xn)=2M(xn)x2(1+(M(xn)x)2)3/2,
Ka(xn)=1xn0xnKm(x)dx.
ΦEFL(xn)=ncnara(xn)+nqncrp(xnΔx)t(xn)(ncna)(nqnc)ncra(xn)rp(xnΔx),
ΦBFL(xn)=ncra(xn)ΦEFL(xn)ncra(xn)t(xn)(ncna).

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