Disease or Syndrome
night blindness Audio
night blind·ness
Subclass of:
Vision Disorders
Definitions related to nyctalopia:
  • Inability to see well at night or in poor light.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2021
  • (night blindness) Failure or imperfection of vision at night or in dim light, with good vision only on bright days. (Dorland, 27th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
  • (night blindness) Inability to see clearly in dim light.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • (night blindness) Poor visual function in dim light.
    NICHD Pediatric Terminology
    U.S. National Cancer Institute, 2021
  • (night blindness) A disorder characterized by an inability to see clearly in dim light.
    Common Terminology Criteria for Adverse Events
    U.S. National Institutes of Health, 2021
  • Night blindness is the inability of the eye to adapt to reduced illumination, leading to a complaint of not being able to see at night or in dim light. No standard classification system exists for night blindness. The conditions within this monograph are divided into those with an underlying genetic cause and acquired conditions (i.e.,...
    Epocrates
    Athenahealth, Inc., 2019
  • Night blindness, failure of the eye to adapt promptly from light to darkness that is characterized by a reduced ability to see in dim light or at night. It occurs as a symptom of numerous congenital and inherited retinal diseases or as a result of vitamin A deficiency. Congenital night blindness...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2020
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