WhitetowhASCRS06

1
Department of Ophthalmology
Johannes Gutenberg-University Mainz, Germany
Is the white-to-white distance a predictor
for pupil size changes ?
Sabine Buchner, H.Burkhard Dick
ASCRS San Francisco, 2006
No financial interest
2
Patients

• Enclavation distance 8.5 mm, horizontal
• 46 eyes underwent phakic iris-claw IOL
  implantation Verisyse (AMO, Germany), Artisan,
  Artiflex (OPHTEC, The Netherlands)
• Two groups 1.
  White-to-white distance lt 12.5
  mm (n34) 2. White-to-white
  distance 12.5 mm (n12)

3
Methods

• Pupil size at scotopic (0.03
  lux), mesopic low (0.82 lux) and mesopic
  high (6.4 lux) illumination conditions digital
  binocular infrared pupillometer (Procyon, UK)
• White-to-white distances IOLMaster (Carl Zeiss,
  Germany)
• Examinations pre- and 3
  months postoperatively
• Statistical analysis SPSS 11.0,
  Wilcoxon test

Pupil size/ Procyon
White-to-white/ IOLMaster
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Results
postoperative decrease of scotopic pupil size
W-t-w lt 12.5 mm decrease of 1.7
in median p 0.3 not
significant W-t-w 12.5 mm decrease of
1.5 in median p 1.0
not significant
post scotopic decrease

5
Results
postoperative decrease of mesopic low pupil size

W-t-w lt 12.5 mm decrease of 6.1
in median p 0.01
significant W-t-w 12.5 mm decrease of
14 in median p 0.04
significant


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Results
postoperative decrease of mesopic high pupil size

W-t-w lt 12.5 mm decrease of 4.4
in median p 0.04
significant W-t-w 12.5 mm decrease of
8.3 in median p 0.04
significant

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Conclusion

• The largest decrease valued 14
  (W-t-w 12.5 mm) at mesopic low illumination.
• The decrease in pupil size after iris-claw phakic
  IOL implantation was higher in eyes with
  white-to-white distance 12.5 mm (p-value
  0.089 mesopic low illumination). One potential
  reason may be the position of the enclavation
  relative to the center of the iris.