Abstract
Purpose
To investigate whether macular pigment optical density (MPOD) is related to dark adaptation in healthy subjects.
Methods
Dark adaptation was measured after a minimum 30 % pigment bleach in 33 subjects (aged 15–68), using a white 1° stimulus presented 11° below fixation on a cathode ray tube monitor. The luminance range of the monitor was extended using neutral density filters. A heterochromatic flicker photometry based instrument (MPS 9000) was used to measure MPOD.
Results
The average MPOD for the whole group was 0.37 ±0.21 optical density units. Subjects with lighter irides had on average 40 % lower MPOD compared to those with darker irides (0.3 ± 0.20 vs 0.5 ± 0.19). Group mean MPOD was weakly associated with second (r = 0.32, p = 0.07) and third rod-mediated recovery rates (r = 0.31, p = 0.08) and with the rod threshold (r = −0.24, p = 0.18) 30 min after the onset of bleach. MPOD was unrelated to cone time constant (r = −0.02, p = 0.91), cone threshold (r = −0.01, p = 0.96), rod–cone break (r = 0.13, p = 0.45) or the rod–rod break (r = 0.11, p = 0.52). The second rod-mediated recovery rate (S2) for the lower 10th percentile of MPOD (n = 4) was 0.18 log cd.m-2.min-1 and 0.24 log cd.m-2.min-1 for the upper 10th percentile (n = 4). The two groups were significantly different (t = −2.67, p = 0.037).
Conclusions
We report a statistically significant difference between subjects falling in the 10th percentile extremes of MPOD and rod-mediated but not cone-mediated sensitivity recovery. Further investigation into the relationship between MPOD and rod function is warranted, particularly extending the work to encompass those with low MPOD and poor night vision.
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Acknowledgments
The authors would like to thank Dr Daniel H. Baker for his help with Matlab coding. This research was supported by a BBSRC grant (BB/F017227/1) and Vitabiotics. Neil R.A. Parry and Tariq Aslam’s participation was facilitated by the Manchester Biomedical Research Centre and the Greater Manchester Comprehensive Local Research Network.
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Neil R.A. Parry has a proprietorial interest in the dark adaptation software described here. Ian J. Murray and Dave Carden are the joint inventors and patent holders of the MPS 9000.
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Patryas, L., Parry, N.R.A., Carden, D. et al. The association between dark adaptation and macular pigment optical density in healthy subjects. Graefes Arch Clin Exp Ophthalmol 252, 657–663 (2014). https://doi.org/10.1007/s00417-014-2564-z
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DOI: https://doi.org/10.1007/s00417-014-2564-z