Abstract

We dispute the claim made by Dubbelman and colleagues [J. Opt. Soc. Am. A 22, 1216 (2005); this issue] that “incorrect statistical methods” were used to compare the MRI and Scheimpflug data. We clearly stated that we “analyzed the covariance of regression lines” in the results section. We believe the analysis of covariance of regression lines, as shown by Snedecor and Cochran [Statistical Methods (Iowa State U. Press, Ames, Iowa, 1989)] is as “correct” as the “straightforward statistical comparison” of confidence intervals employed by Dubbelman and colleagues; however; our statistical method has the benefit of being more precise and stringent than a simple comparison of confidence intervals.

© 2005 Optical Society of America

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References

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  1. M. Dubbelman, G. L. Van der Heijde, “The shape of the aging human lens: curvature, equivalent refractive index and the lens paradox,” Vision Res. 41, 1867–1877 (2001).
    [CrossRef] [PubMed]
  2. M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
    [CrossRef]
  3. N. Brown, “An advanced slit-image camera,” Br. J. Ophthamol. 56, 624–631 (1972).
    [CrossRef]
  4. N. Brown, “Slit-image photography and measurement of the eye,” Med. Biol. Illus. 23, 192–203 (1973).
    [PubMed]
  5. N. Brown, “The change in shape and internal form of the lens of the eye on accommodation,” Exp. Eye Res. 15, 441–459 (1973).
    [CrossRef] [PubMed]
  6. N. Brown, “Quantitative slit-image photography of the anterior chamber,” Trans. Ophthalmol. Soc. U. K. 93, 277–286 (1973).
    [PubMed]
  7. N. Brown, “Quantitative slit-image photography of the lens,” Trans. Ophthalmol. Soc. U. K. 92, 303–307 (1972).
    [PubMed]
  8. N. Brown, “The change in lens curvature with age,” Exp. Eye Res. 19, 175–183 (1974).
    [CrossRef] [PubMed]
  9. A. Glasser, M. C. Campbell, “Biometric, optical and physical changes in the isolated human crystalline lens with age in relation to presbyopia,” Vision Res. 39, 1991–2015 (1999).
    [CrossRef] [PubMed]
  10. J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
    [CrossRef] [PubMed]
  11. M. Dubbelman, R. G.L. van der Heijde, H. A. Weeber, “Comment on ‘Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study,”’ J. Opt. Soc. Am. A 22, 1216–1218 (2005).
    [CrossRef]
  12. G. Snedecor, W. Cochran, Statistical Methods (Iowa State University Press, Ames, Iowa, 1989).
  13. J. F. Koretz, S. A. Strenk, L. M. Strenk, J. L. Semmlow, “Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study,” J. Opt. Soc. Am. A 21, 346–354 (2004).
    [CrossRef]

2005 (1)

2004 (1)

2001 (2)

M. Dubbelman, G. L. Van der Heijde, “The shape of the aging human lens: curvature, equivalent refractive index and the lens paradox,” Vision Res. 41, 1867–1877 (2001).
[CrossRef] [PubMed]

M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
[CrossRef]

1999 (1)

A. Glasser, M. C. Campbell, “Biometric, optical and physical changes in the isolated human crystalline lens with age in relation to presbyopia,” Vision Res. 39, 1991–2015 (1999).
[CrossRef] [PubMed]

1984 (1)

J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
[CrossRef] [PubMed]

1974 (1)

N. Brown, “The change in lens curvature with age,” Exp. Eye Res. 19, 175–183 (1974).
[CrossRef] [PubMed]

1973 (3)

N. Brown, “Slit-image photography and measurement of the eye,” Med. Biol. Illus. 23, 192–203 (1973).
[PubMed]

N. Brown, “The change in shape and internal form of the lens of the eye on accommodation,” Exp. Eye Res. 15, 441–459 (1973).
[CrossRef] [PubMed]

N. Brown, “Quantitative slit-image photography of the anterior chamber,” Trans. Ophthalmol. Soc. U. K. 93, 277–286 (1973).
[PubMed]

1972 (2)

N. Brown, “Quantitative slit-image photography of the lens,” Trans. Ophthalmol. Soc. U. K. 92, 303–307 (1972).
[PubMed]

N. Brown, “An advanced slit-image camera,” Br. J. Ophthamol. 56, 624–631 (1972).
[CrossRef]

Brown, N.

N. Brown, “The change in lens curvature with age,” Exp. Eye Res. 19, 175–183 (1974).
[CrossRef] [PubMed]

N. Brown, “Slit-image photography and measurement of the eye,” Med. Biol. Illus. 23, 192–203 (1973).
[PubMed]

N. Brown, “The change in shape and internal form of the lens of the eye on accommodation,” Exp. Eye Res. 15, 441–459 (1973).
[CrossRef] [PubMed]

N. Brown, “Quantitative slit-image photography of the anterior chamber,” Trans. Ophthalmol. Soc. U. K. 93, 277–286 (1973).
[PubMed]

N. Brown, “An advanced slit-image camera,” Br. J. Ophthamol. 56, 624–631 (1972).
[CrossRef]

N. Brown, “Quantitative slit-image photography of the lens,” Trans. Ophthalmol. Soc. U. K. 92, 303–307 (1972).
[PubMed]

Brown, N. P.

J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
[CrossRef] [PubMed]

Campbell, M. C.

A. Glasser, M. C. Campbell, “Biometric, optical and physical changes in the isolated human crystalline lens with age in relation to presbyopia,” Vision Res. 39, 1991–2015 (1999).
[CrossRef] [PubMed]

Cochran, W.

G. Snedecor, W. Cochran, Statistical Methods (Iowa State University Press, Ames, Iowa, 1989).

Dubbelman, M.

M. Dubbelman, R. G.L. van der Heijde, H. A. Weeber, “Comment on ‘Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study,”’ J. Opt. Soc. Am. A 22, 1216–1218 (2005).
[CrossRef]

M. Dubbelman, G. L. Van der Heijde, “The shape of the aging human lens: curvature, equivalent refractive index and the lens paradox,” Vision Res. 41, 1867–1877 (2001).
[CrossRef] [PubMed]

M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
[CrossRef]

Glasser, A.

A. Glasser, M. C. Campbell, “Biometric, optical and physical changes in the isolated human crystalline lens with age in relation to presbyopia,” Vision Res. 39, 1991–2015 (1999).
[CrossRef] [PubMed]

Handelman, G. H.

J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
[CrossRef] [PubMed]

Koretz, J. F.

J. F. Koretz, S. A. Strenk, L. M. Strenk, J. L. Semmlow, “Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study,” J. Opt. Soc. Am. A 21, 346–354 (2004).
[CrossRef]

J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
[CrossRef] [PubMed]

Semmlow, J. L.

Snedecor, G.

G. Snedecor, W. Cochran, Statistical Methods (Iowa State University Press, Ames, Iowa, 1989).

Strenk, L. M.

Strenk, S. A.

Van der Heijde, G. L.

M. Dubbelman, G. L. Van der Heijde, “The shape of the aging human lens: curvature, equivalent refractive index and the lens paradox,” Vision Res. 41, 1867–1877 (2001).
[CrossRef] [PubMed]

M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
[CrossRef]

van der Heijde, R. G.L.

Weeber, H. A.

M. Dubbelman, R. G.L. van der Heijde, H. A. Weeber, “Comment on ‘Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study,”’ J. Opt. Soc. Am. A 22, 1216–1218 (2005).
[CrossRef]

M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
[CrossRef]

Br. J. Ophthamol. (1)

N. Brown, “An advanced slit-image camera,” Br. J. Ophthamol. 56, 624–631 (1972).
[CrossRef]

Exp. Eye Res. (2)

N. Brown, “The change in lens curvature with age,” Exp. Eye Res. 19, 175–183 (1974).
[CrossRef] [PubMed]

N. Brown, “The change in shape and internal form of the lens of the eye on accommodation,” Exp. Eye Res. 15, 441–459 (1973).
[CrossRef] [PubMed]

J. Opt. Soc. Am. A (2)

Med. Biol. Illus. (1)

N. Brown, “Slit-image photography and measurement of the eye,” Med. Biol. Illus. 23, 192–203 (1973).
[PubMed]

Optom. Vision Sci. (1)

M. Dubbelman, G. L. van der Heijde, H. A. Weeber, “The thickness of the aging human lens obtained from corrected Scheimpflug images,” Optom. Vision Sci. 78, 411–416 (2001).
[CrossRef]

Trans. Ophthalmol. Soc. U. K. (2)

N. Brown, “Quantitative slit-image photography of the anterior chamber,” Trans. Ophthalmol. Soc. U. K. 93, 277–286 (1973).
[PubMed]

N. Brown, “Quantitative slit-image photography of the lens,” Trans. Ophthalmol. Soc. U. K. 92, 303–307 (1972).
[PubMed]

Vision Res. (3)

M. Dubbelman, G. L. Van der Heijde, “The shape of the aging human lens: curvature, equivalent refractive index and the lens paradox,” Vision Res. 41, 1867–1877 (2001).
[CrossRef] [PubMed]

A. Glasser, M. C. Campbell, “Biometric, optical and physical changes in the isolated human crystalline lens with age in relation to presbyopia,” Vision Res. 39, 1991–2015 (1999).
[CrossRef] [PubMed]

J. F. Koretz, G. H. Handelman, N. P. Brown, “Analysis of human crystalline lens curvature as a function of accommodative state and age,” Vision Res. 24, 1141–1151 (1984).
[CrossRef] [PubMed]

Other (1)

G. Snedecor, W. Cochran, Statistical Methods (Iowa State University Press, Ames, Iowa, 1989).

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