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• Author's reply
  Satoshi Kogure
  Published on: 3 April 2006
• Detecting early visual field loss with Frequency Doubling Perimetry
  John A Landers
  Published on: 8 March 2006

• Published on: 3 April 2006

  Author's reply

  • Satoshi Kogure, Surgeon

  Dear Editor,

  We appreciate a response to our study from Dr Landers et al. They reported that five out of ten eyes with abnormal result of Frequency Doubling Perimetry (FDP) and normal result of Achromatic Automated Perimetry (AAP) showed abnormal result on AAP four years later.[1] It was our mistake that we referred their study as a cross-sectional study in our paper. We apologize to them that we should have referr...

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  Dear Editor,

  We appreciate a response to our study from Dr Landers et al. They reported that five out of ten eyes with abnormal result of Frequency Doubling Perimetry (FDP) and normal result of Achromatic Automated Perimetry (AAP) showed abnormal result on AAP four years later.[1] It was our mistake that we referred their study as a cross-sectional study in our paper. We apologize to them that we should have referred it as one of longitudinal studies along with another two papers.

  Reference

  1. Landers J, Goldberg I, Graham S. Detection of Early Visual Field. Loss in Glaucoma Using Frequency Doubling Perimetry and Short Wavelength. Automated Perimetry. Arch. Ophthalmol. 2003;121:1705-10.

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  Conflict of Interest:
  None declared.

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• Published on: 8 March 2006

  Detecting early visual field loss with Frequency Doubling Perimetry

  • John A Landers
  • Other Contributors:
    • Ivan Goldberg, Stuart L Graham

  Dear Editor,

  We congratulate Kogure et al,[1] on a well designed longitudinal study, which confirms the suspicions of many earlier investigators, who conjectured that Frequency Doubling Perimetry (FDP) may be able to detect visual field loss earlier than Achromatic Automated Perimetry (AAP) based on cross-sectional data. In their text they refer to our longitudinal study[2] as a cross-sectional one and go on to s...

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  Dear Editor,

  We congratulate Kogure et al,[1] on a well designed longitudinal study, which confirms the suspicions of many earlier investigators, who conjectured that Frequency Doubling Perimetry (FDP) may be able to detect visual field loss earlier than Achromatic Automated Perimetry (AAP) based on cross-sectional data. In their text they refer to our longitudinal study[2] as a cross-sectional one and go on to say that there have only been two other papers, which have demonstrated that FDP predicts future AAP visual field loss in a longitudinal fashion. Our paper was conducted over a four-year period, with the first-year data presented as a cross- sectional study[3] and the final data showing the relationship between FDP and AAP longitudinally.[2]

  In addition, Kogure et al. have shown quantitatively that the location of FDP field loss can predict the location of future AAP field loss. We also noted qualitatively a topographical relationship between the two perimeters, however our original methodology had not included this premise. Their topographical analysis adds credence to the principle that these early FDP changes are the same visual field loss seen several years later on AAP.

  References

  1. Kogure S, Toda Y, Tsukahara S. Prediction of future scotoma on conventional automated static perimetry using frequency doubling technology perimetry. Br J Ophthalmol. 2006;90:347–52.

  2. Landers J, Goldberg I, Graham S. Detection of Early Visual Field Loss in Glaucoma Using Frequency Doubling Perimetry and Short Wavelength Automated Perimetry. Arch. Ophthalmol. 2003;121:1705-10.

  3. Landers J, Goldberg I, Graham S. A Comparison of Short Wavelength Automated Perimetry with Frequency Doubling Perimetry for the Early Detection of Visual Field Loss in Ocular Hypertension. Clin. Exp. Ophthalmol. 2000;28:248-52.

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  Conflict of Interest:
  None declared.

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