December 2002
Volume 43, Issue 13
ARVO Annual Meeting Abstract  |   December 2002
Pupil Center Shift Depending on Focal Retinal Stimulation?
Author Affiliations & Notes
  • D Sandner
    Department of Ophthalmology University Eye Clinic Dresden Germany
  • U Genth
    Department of Ophthalmology University Eye Clinic Dresden Germany
  • P Lutz
    Sensomotoric Instruments Teltow Germany
  • LE Pillunat
    Department of Ophthalmology University Eye Clinic Dresden Germany
  • Footnotes
    Commercial Relationships   D. Sandner, None; U. Genth, None; P. Lutz, None; L.E. Pillunat, None.
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 162. doi:
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    • Get Citation

      D Sandner, U Genth, P Lutz, LE Pillunat; Pupil Center Shift Depending on Focal Retinal Stimulation? . Invest. Ophthalmol. Vis. Sci. 2002;43(13):162.

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

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Abstract: : Purpose: The constriction of the pupil during adaption is depending on the orientation of light illuminating the retina. This is to determine the shift of the center of the pupil and its shape during constriction depending on the orientation of the light projection. Methods: The pupils of 14 persons were captured by infrared videography colinear to a fixation diode. The adaption for at least one minute was done at 16 lux, the retina was illuminated from temporal, superior, nasal and inferior at 8000 lux. Digital image processing using eye tracking algorithms was done to determine the size, the elliptical shape and the position of the pupil and the limbus. Using the position of the limbus as a reference leads to the amount of pupil center shift. Results: Average pupil size adapted to dark was 4.3±1.1mm (SD), the eccentricity was 0.037. Under light conditions the average was 3.0±0,52mm, the eccentricity was 0.04. The mean shift of the pupil was 0.18±0.14mm (SD) for the right and 0.22±0.13mm (SD) for the left eye, the mean direction of the center shift was towards nasal and was not depending on the orientation of projected light. Conclusion: The center of the pupil is not independent from the pupil size, under different light conditions the pupil center is shifting. It is also considerable that pharmacologically dilated pupils showed an increasing center shift. Although eye trackers used in refractive surgery are fast enough to determine the pupil center even under mydriatic conditions, it should be considered that the detected center of the cornea may vary during PRK or Lasik. CR: None

Keywords: 534 pupil • 550 refractive surgery: optical quality • 384 dark/light adaptation 

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