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Related Experiment Videos

Dark adaptation in hyperprolactinemic women.

A B Fulton1, V Greenwood, R M Hansen

  • 1Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts.

Investigative Ophthalmology & Visual Science
|June 1, 1989
PubMed
Summary

This study investigated if subclinical zinc deficiency causes hyperprolactinemia. Results showed subtle dark adaptation differences in hyperprolactinemic women, suggesting zinc deficiency is unlikely the sole cause.

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Ophthalmology

Background:

  • Hyperprolactinemia is a condition characterized by elevated prolactin levels.
  • Subclinical zinc deficiency has been hypothesized as a potential cause of hyperprolactinemia.
  • Zinc is an essential cofactor for various metabolic processes, including vitamin A metabolism.

Purpose of the Study:

  • To test the hypothesis that subclinical zinc deficiency causes hyperprolactinemia.
  • To assess tissue zinc status in women with primary hyperprolactinemia using dark-adaptation measurements.
  • To explore potential links between hyperprolactinemia, zinc status, and visual function.

Main Methods:

  • Dark-adaptation curves were measured in seven women with primary hyperprolactinemia and seven healthy controls.

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  • Plasma zinc levels were analyzed.
  • Visual function, specifically rod and cone dark adaptation, was assessed to evaluate tissue zinc status.

    • Main Results:

    • No significant differences were found in plasma zinc levels or rod dark adaptation between hyperprolactinemic patients and normal subjects.
    • Hyperprolactinemic patients exhibited a significantly higher median cone plateau (0.66 log units) compared to controls.
    • This subtle abnormality in cone dark adaptation was not readily explained by impaired vitamin A metabolism.

    Conclusions:

    • Subclinical zinc deficiency is unlikely to be the primary cause of hyperprolactinemia.
    • Hyperprolactinemia is associated with a subtle, specific abnormality in cone-mediated dark adaptation.
    • Further research is needed to elucidate the underlying mechanisms of this visual function alteration in hyperprolactinemia.