Abstract

We tested the effects on laser ablation of reflection losses and nonnormal incidence on the anterior cornea. We measured presurgical and postsurgical corneal asphericity in 94 myopic eyes, comparing it with the corneal asphericity predicted by the Munnerlyn formula, modified or not, with an adjustment factor that takes into account the two effects mentioned above. The predictive power of the experimental results was stronger when we considered the adjustment factor. We propose to modify ablation algorithms by taking this adjustment factor into account, especially in customized corneal ablation, which needs high accuracy for correcting eye aberrations.

© 2003 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. S. Marcos, Opt. Photon. News 12(1), 22 (2001).
    [CrossRef]
  2. S. M. MacRae, R. R. Krueger, and R. A. Applegate, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 3–9.
  3. M. Mrochen and T. Seiler, J. Refract. Surg. 17, S584 (2001).
    [PubMed]
  4. J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
    [CrossRef]
  5. J. T. Holladay and J. A. Janes, J. Cataract Refract. Surg. 28, 942 (2002).
    [CrossRef] [PubMed]
  6. R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).
  7. J. R. Jiménez, R. G. Anera, and L. Jiménez del Barco, “Equation for corneal asphericity after refractive surgery,” J. Refract. Surg. (to be published).
  8. S. Pardhan and W. A. Douthwaite, J. Refract. Surg. 14, 414 (1998).
    [PubMed]
  9. F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
    [CrossRef] [PubMed]
  10. D. Huan, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 51–62.

2002

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

J. T. Holladay and J. A. Janes, J. Cataract Refract. Surg. 28, 942 (2002).
[CrossRef] [PubMed]

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

2001

S. Marcos, Opt. Photon. News 12(1), 22 (2001).
[CrossRef]

M. Mrochen and T. Seiler, J. Refract. Surg. 17, S584 (2001).
[PubMed]

1998

S. Pardhan and W. A. Douthwaite, J. Refract. Surg. 14, 414 (1998).
[PubMed]

Anera, R. G.

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

J. R. Jiménez, R. G. Anera, and L. Jiménez del Barco, “Equation for corneal asphericity after refractive surgery,” J. Refract. Surg. (to be published).

Applegate, R. A.

S. M. MacRae, R. R. Krueger, and R. A. Applegate, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 3–9.

Bermúdez, J.

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

Culbertson, W.

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

Douthwaite, W. A.

S. Pardhan and W. A. Douthwaite, J. Refract. Surg. 14, 414 (1998).
[PubMed]

Hita, E.

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

Ho, A.

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

Holladay, J. T.

J. T. Holladay and J. A. Janes, J. Cataract Refract. Surg. 28, 942 (2002).
[CrossRef] [PubMed]

Huan, D.

D. Huan, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 51–62.

Janes, J. A.

J. T. Holladay and J. A. Janes, J. Cataract Refract. Surg. 28, 942 (2002).
[CrossRef] [PubMed]

Jiménez, J. R.

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

J. R. Jiménez, R. G. Anera, and L. Jiménez del Barco, “Equation for corneal asphericity after refractive surgery,” J. Refract. Surg. (to be published).

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

Jiménez del Barco, L.

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

Jiménez del Barco, L.

J. R. Jiménez, R. G. Anera, and L. Jiménez del Barco, “Equation for corneal asphericity after refractive surgery,” J. Refract. Surg. (to be published).

Krueger, R. R.

S. M. MacRae, R. R. Krueger, and R. A. Applegate, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 3–9.

MacRae, S. M.

S. M. MacRae, R. R. Krueger, and R. A. Applegate, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 3–9.

Manns, F.

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

Marcos, S.

S. Marcos, Opt. Photon. News 12(1), 22 (2001).
[CrossRef]

Mrochen, M.

M. Mrochen and T. Seiler, J. Refract. Surg. 17, S584 (2001).
[PubMed]

Pardhan, S.

S. Pardhan and W. A. Douthwaite, J. Refract. Surg. 14, 414 (1998).
[PubMed]

Patel, J. M.

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

Seiler, T.

M. Mrochen and T. Seiler, J. Refract. Surg. 17, S584 (2001).
[PubMed]

Appl. Phys. Lett.

J. R. Jiménez, R. G. Anera, L. Jiménez del Barco, and E. Hita, Appl. Phys. Lett. 81, 1521 (2002).
[CrossRef]

J. Cataract Refract. Surg.

J. T. Holladay and J. A. Janes, J. Cataract Refract. Surg. 28, 942 (2002).
[CrossRef] [PubMed]

R. G. Anera, J. R. Jiménez, L. Jiménez del Barco, J. Bermúdez, and E. Hita, “Changes in corneal asphericity after laser in situ keratomileusis,” J. Cataract Refract. Surg. (to be published).

F. Manns, A. Ho, J. M. Patel, and W. Culbertson, J. Cataract Refract. Surg. 28, 766 (2002).
[CrossRef] [PubMed]

J. Refract. Surg.

J. R. Jiménez, R. G. Anera, and L. Jiménez del Barco, “Equation for corneal asphericity after refractive surgery,” J. Refract. Surg. (to be published).

S. Pardhan and W. A. Douthwaite, J. Refract. Surg. 14, 414 (1998).
[PubMed]

M. Mrochen and T. Seiler, J. Refract. Surg. 17, S584 (2001).
[PubMed]

Opt. Photon. News

S. Marcos, Opt. Photon. News 12(1), 22 (2001).
[CrossRef]

Other

S. M. MacRae, R. R. Krueger, and R. A. Applegate, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 3–9.

D. Huan, in Customized Corneal Ablation: The Quest for Supervision, S. M. McRae, R. R. Krueger, and R. A. Applegate, eds. (Slack, Thorofare, N.J., 2001), pp. 51–62.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (1)

Fig. 1
Fig. 1

Average of experimental corneal asphericity (p-factor) presurgery and 3 months postsurgery for 94 myopic eyes operated on with Lasik. Short-dashed lines mark the predicted postsurgery corneal-asphericity averages when the adjustment factor (a=0.62, 0.88, and 1.14) is considered in the Munnerlyn formula. The longer-dashed line represents the average corneal asphericity predicted with the Munnerlyn formula without the adjustment factor. Experimental data include the standard error.

Tables (1)

Tables Icon

Table 1 Experimental Corneal Asphericity (p-Factor) Average for All Patients Pre- and Post-Lasika

Equations (5)

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

ρa,y,R,p=1-0.0435a-ay22R2+a0.232-0.5py4R4,
padj=p+aD/Rd2-0.62+1.333p-1.333R21+8DR/3-0.116aDR+ad2D/3R3,
sy=4Dy23-Dd23.
pMunn=p1+8RD/33.
Δzy=y2-91.125R3Δp,

Metrics