Abstract
Background
We sought to determine the cause of reduced scotopic and photopic electroretinograms (ERGs) and night blindness in a 46-year-old man with liver dysfunction but no history of alcoholism.
Case
A 46-year-old Japanese man with a complaint of visual difficulties in dim light for 1 month.
Observations
By electrophysiological investigation, the patient was found to have low levels of serum zinc and vitamin A on admission. The rod b wave was unrecordable, and the bright-flash ERGs were reduced, with the a wave > b wave. The amplitudes of the cone and 30-Hz flicker responses were also reduced, and their implicit times were prolonged. Three weeks after admission, the patient's serum zinc level recovered to normal levels, but his serum vitamin A level was still low. The symptoms of night blindness were gone, and the rod ERGs and single bright-flash responses were within normal limits. However, the cone ERGs and 30-Hz flicker responses were still depressed.
Conclusions
The recovery of scotopic function together with the recovery of zinc but not vitamin A levels suggests that the ERG changes were most likely related to low zinc levels.
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References
SA Morrison RM Russell EA Carney EV Oaks (1978) ArticleTitleZinc deficiency: a case of abnormal dark adaptation in cirrhotics Am J Clin Nutr 31 276–281 Occurrence Handle1:STN:280:DyaE1c7gtVCmsg%3D%3D Occurrence Handle10.1093/ajcn/31.2.276 Occurrence Handle623051
IH Leopold (1978) ArticleTitleZinc deficiency and visual impairment? Am J Ophthalmol 85 871–875 Occurrence Handle1:STN:280:DyaE1c3jt1Oqug%3D%3D Occurrence Handle10.1016/S0002-9394(14)78122-X Occurrence Handle354389
SP Kraft JA Parker Y Matuk AV Rao (1987) ArticleTitleThe rat electroretinogram in combined zinc and vitamin A deficiency Invest Ophthalmol Vis Sci 28 975–984 Occurrence Handle1:CAS:528:DyaL2sXkslKmu74%3D Occurrence Handle3583636
M Ugarte NN Osborne (2001) ArticleTitleZinc in the retina Prog Neurobiol 64 219–249 Occurrence Handle1:CAS:528:DC%2BD3MXhs1aqsbc%3D Occurrence Handle10.1016/S0301-0082(00)00057-5 Occurrence Handle11240307
T Amemiya (1999) ArticleTitleThe eye and nutrition (in Japanese) Nihon Ganka Gakkai Zasshi (J Jpn Ophthalmol Soc) 103 829–850 Occurrence Handle1:CAS:528:DC%2BD3cXhtFCksLg%3D
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Mochizuki, K., Murase, H., Imose, M. et al. Improvement of Scotopic Electroretinograms and Night Blindness with Recovery of Serum Zinc Levels. Jpn J Ophthalmol 50, 532–536 (2006). https://doi.org/10.1007/s10384-006-0376-3
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DOI: https://doi.org/10.1007/s10384-006-0376-3