September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Rotating Scheimpflug Camera Curvature Decentration Indices
Author Affiliations & Notes
  • Nermine Said Aly Madkour
    Ophthalmology, Al Watany Eye Hospital, Cairo, Egypt
  • Maged M Roshdy
    Ophthalmology, Ain Shams University, Cairo, Egypt
    Ophthalmology, Al Watany Eye Hospital, Cairo, Egypt
  • Sherine S Wahba
    Ophthalmology, Al Watany Eye Hospital, Cairo, Egypt
    Ophthalmology, Ain Shams University, Cairo, Egypt
  • Footnotes
    Commercial Relationships   Nermine Madkour, None; Maged Roshdy, Alcon Labs (R); Sherine Wahba, Alcon Labs (R)
  • Footnotes
    Support  ARVO Egypt Travel Grant
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 1906. doi:
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    • Get Citation

      Nermine Said Aly Madkour, Maged M Roshdy, Sherine S Wahba; Rotating Scheimpflug Camera Curvature Decentration Indices. Invest. Ophthalmol. Vis. Sci. 2016;57(12):1906.

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      © 2017 Association for Research in Vision and Ophthalmology.

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Abstract

Purpose : To study the accuracy and correlation between different curvature decentration indices; anterior corneal curvature (A) both Inferior minus Superior value (I-S) astride horizontal meridian (h) and I-S value astride flattest meridian (f), posterior corneal curvature (P) I-S value astride horizontal meridian (h) and Index of Height Decentration (IHD).

Methods : In a retrospective study; history taking, clinical examination, and rotating Scheimpflug camera scanning (by Oculyzer II equivalent to Pentacam HR) were done to 94 eyes; 57 normal, 20 forme frust keratoconus FFKC (apparently normal cornea whose fellow eye with evident keratoconus(KC)) and 17 KC. All cases of corneal scars or previous corneal surgeries were excluded. I-S value was calculated manually from 10 points astride the horizontal and flat meridians for anterior corneal curvature and astride the horizontal meridian for posterior corneal curvature. IHD is calculated automatically by the device software 1.17r119.

Results : The mean values of A I-S h in normal corneas versus (vs) FFKC and KC eyes were 0.19 ±0.62 vs 2.19 ±3.03 (P<.001), A I-S f 0.10 ±0.60 vs 1.64 ±1.94 (P<.001), P I-S h -1.25 ±3.83 vs 0.45 ±0.50 (P=.002), and IHD 0.113±0.794 vs 0.032 ±0.041 (P=.444). The four indices were highly correlated (P<.0001). The highest correlation coefficient was between A I-S h and A I-S f (r 2 =.913) and the least was between IHD and A I-S f (r 2 =.621).

Conclusions : All the three commonly used topographic decentration indices are correlated. The three types of I-S indices are more useful in detection of KC and FFKC than the IHD.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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