New%203-Dimensional%20Scheimpflug%20Analysis%20of%20Cataract%20Density

1
New 3-Dimensional Scheimpflug Analysis of
Cataract Density
tanja_rabsilber_at_med.uni-heidelberg.de

• T.M. Rabsilber, MD, S. Hara, MD,
• I.J. Limberger, MD, A. Ehmer, MD, G.U. Auffarth,
  MD

Dept. of Ophthalmology, University of
Heidelberg, Germany, Director Prof. Dr. H.E.
Völcker
The authors have no financial interest in the
products mentioned here
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Introduction

• The subjective grading of the density of cataract
  is
• - time-consuming
• - complicated
• - less suitable for longitudinal trial
• An objective grading is required

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Introduction

• Pentacam (Oculus, Germany) is
  an instrument for imaging the anterior segment of
  the eye by a rotating Scheimpflug camera
  measurement.

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Introduction

• With Pentacam we can grade the density of
  cataract by quantifying the density and the area
  of the lens opacification in 3-dimension with the
  specific software installed.

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Purpose

• We objectively and 3-dimentionally graded the
  density of cataract into 5 grades using
  Pentacam.
• We investigated the difference in the mean total
  phaco energy during phacoemulsification comparing
  the 5 grades.

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Patients and Methods

• 186 eyes of 166 patients undergoing
  phacoemulsification for cataract using Infinity
  (Alcon Inc.) by only one surgeon.
• They were preoperatively examined with Pentacam
  and graded into 5 grades according to the density
  and the area of the opacification of lenses.
• There is no case with any complication neither
  during nor after surgery.

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Patients and Methods

• The phaco time and the average phaco power were
  examined and the total phaco energy was
  calculated for each case.
• Kruskal-Wallis Test was used to analyze
  statistically the difference in the mean total
  phaco energy between 5 groups.

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Grading with Pentacam

• Grade 1 Grade 2 Grade 3 Grade 4
  Grade 5

• These photographs show the images of each grade.
• As the grade increases, a higher density of the
  lens center is recognized.

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Numbers in each grade
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The grade of the density of cataract and the
mean total phaco energy
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Results

• The mean phaco energies were
• 4.28, 6.87, 7.34, 8.61, 8.93, (G1, 2, 3, 4,
  5).
• The mean phaco energies were increasing
• with higher grades.
• In the group of the G1, the mean phaco energy was
  statistically lower than any other groups (from
  plt0.001 to plt0.05).

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Conclusion

• Mean phaco energy increased with higher
• density grades.
• It is possible to use Pentacam as a new
  objective 3-D grading system of the cataract
  density.