March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Dark adaptation in relation to choroidal thickness in 42 Danish university students
Author Affiliations & Notes
  • Xiao Q. Li
    Department of Ophthalmology, Glostrup Hospital, Glostrup, Denmark
  • Cigdem Altuntas
    Department of Ophthalmology, Glostrup Hospital, Glostrup, Denmark
  • Oliver Klefter
    Department of Ophthalmology, Glostrup Hospital, Glostrup, Denmark
  • Gregory R. Jackson
    Ophthalmology, Penn State College of Medicine, Hershey, Pennsylvania
  • Michael Larsen
    Department of Ophthalmology, Glostrup Hospital, Glostrup, Denmark
  • Inger Christine Munch
    Department of Ophthalmology, Glostrup Hospital, Glostrup, Denmark
  • Footnotes
    Commercial Relationships  Xiao Q. Li, None; Cigdem Altuntas, None; Oliver Klefter, None; Gregory R. Jackson, AdaptDx, Apeliotus Technologies (P); Michael Larsen, None; Inger Christine Munch, None
  • Footnotes
    Support  Suppoted by the Bagenkop Nielsen Myopia Foundation
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 2119. doi:https://doi.org/
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      Xiao Q. Li, Cigdem Altuntas, Oliver Klefter, Gregory R. Jackson, Michael Larsen, Inger Christine Munch; Dark adaptation in relation to choroidal thickness in 42 Danish university students. Invest. Ophthalmol. Vis. Sci. 2012;53(14):2119. doi: https://doi.org/.

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

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Abstract

Purpose: : To investigate the influence of choroidal thickness on rod-mediated dark adaptation in healthy subjects.

Methods: : Cross-sectional observational study of 42 eyes of 42 healthy university students who underwent dark adaptometry and assessment of choroidal thickness using enhanced-depth imaging optical coherence tomography. The speed of rod dark adaptation was expressed as the time taken to reach a pre-defined rod threshold named the rod intercept.

Results: : The mean subfoveal choroidal thickness was 351 μm (SD 106 µm, range 115-568 µm). The mean time to rod intercept was 7.34 min (SD 1.0 min, range 5.02-10.34 min). Regression analysis showed a non-significant decrease in the speed of dark adaptation with increasing choroidal thickness 0.0019 (-0.0012 to 0.0050) min/µm, p=0.21, adjusted for age and sex. Further adjusting for axial length or refraction error did not alter the results. There was no signifcant association between axial length (p=0.18) or refraction (p=0.64) on speed of dark adaptation.

Conclusions: : Rod-mediated dark adaptation was not associated with subfoveal choroidal thickness although the study population presented a large variation the in thickness of the subfoveal choroidea. Choroidal thickness does not appear to influence rod photoreceptor performance in healthy young adults.

Keywords: choroid • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • adaptation: chromatic 
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