Efeito da privação de luz no posicionamento da pálpebra superior

Translated title of the contribution: The effect of darkness on the upper eyelid position

Lígia Cristina Viana Neves, Patrícia Mitiko Akaishi, Cláudio Polegato, Antonio Augusto Velasco E. Cruz

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Purpose: To determine if the resting position of the upper eyelid is affected by darkness. Methods: Palpebral fissure images of normal subjects were acquired in photopic conditions and in total darkness. The subjects were divided in to three groups aged 2-11 months, 22-36 months and 19-61 years. The first palpebral fissure image was acquired in photopic conditions. The lights were then turned off and a second image of the same eye was obtained in total darkness. For both images the distance between the midpupil and upper eyelid margin was measured. Results: Darkness increased this distance in all subjects. The increment in palpebral position was greater in children. Conclusion: Darkness provoked upper eyelid retraction in all subjects tested. This effect probably results from stimulation of the sympathetic tone to Müller's muscle.

Translated title of the contributionThe effect of darkness on the upper eyelid position
Original languagePortuguese
Pages (from-to)455-458
Number of pages4
JournalArquivos brasileiros de oftalmologia
Issue number3
StatePublished - 2004
Externally publishedYes


  • Age groups
  • Child, preschool
  • Darkness/adverse effects
  • Eyelids/physiology
  • Infant

ASJC Scopus subject areas

  • Ophthalmology


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