May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Repeatability of Pupil Size Measurements in Refractive Surgery Candidates
Author Affiliations & Notes
  • W. Herrmann
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • C. Robl
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • P. Prahs
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • K. Hufendiek
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • H. G. Sachs
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • C. P. Lohmann
    Ophthalmology, Technical University of Munich, Regensburg, Germany
  • H. Helbig
    Ophthalmology, University of Regensburg, Regensburg, Germany
  • Footnotes
    Commercial Relationships  W. Herrmann, None; C. Robl, None; P. Prahs, None; K. Hufendiek, None; H.G. Sachs, None; C.P. Lohmann, None; H. Helbig, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 2905. doi:https://doi.org/
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    • Get Citation

      W. Herrmann, C. Robl, P. Prahs, K. Hufendiek, H. G. Sachs, C. P. Lohmann, H. Helbig; Repeatability of Pupil Size Measurements in Refractive Surgery Candidates. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2905. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To assess the individual variety of of the dark-adapted pupil diameter in refractive surgery candidates with a digital infrared pupillometer over 2 testing sessions.

Methods: : Retrospective study of 292 eyes of 146 consecutive refractive surgery candidates (mean age 36.3 years ± 10.2 [SD]). Pupil size was measured at three different illumination levels (scotopic at 0.03 lux, mesopic low at 0.82 lux, and mesopic high at 6.4 lux) with a digital infrared pupillometer (Procyon P2000 SA pupillometer, Procyon Instruments Ltd.). Prior to measurement a 5 minute standardized dark-adaptation protocol was followed. Mean time between both mesurements was 53 days ± 62.8 [SD].

Results: : The difference of 2 consecutive measurements was statistically significant under low mesopic conditions (p<0.01) and high mesopic conditions (p<0.01), but not under scotopic conditions (p=0.362). A considerable difference (>0.5 mm) between both testing sessions was found in 19% of all measurements under scotopic conditions, 41% under low mesopic and 37% under high mesopic conditions.

Conclusions: : Pupil size under low illumination levels might be underestimated if the pupil diameter is only assessed once in refractive surgery candidates.

Keywords: refractive surgery • refractive surgery: LASIK • refractive surgery: PRK 
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