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Updated: Jun 1, 2026

Impression Cytology of the Lid Wiper Area
07:01

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Published on: August 9, 2016

Normal and abnormal lid function.

Janet C Rucker1

  • 1Departments of Neurology and Ophthalmology, The Mount Sinai Medical Center, New York, NY 10029, USA. janet.rucker@mssm.edu

Handbook of Clinical Neurology
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

This chapter details normal eyelid anatomy, physiology, and neurological control, alongside abnormal eyelid functions in various disease states. It covers both excessive lid closure and opening conditions for ocular protection and tear film maintenance.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Anatomy

Background:

  • Eyelids are crucial for ocular protection and maintaining the tear film.
  • Normal eyelid function involves complex behaviors like blinking, closure, and retraction.
  • Neurological control governs these intricate eyelid movements.

Purpose of the Study:

  • To provide a comprehensive overview of normal eyelid anatomy, innervation, and physiology.
  • To detail abnormal eyelid functions associated with various neurological and mechanical disease states.
  • To elucidate the neurophysiology underlying typical and atypical eyelid behaviors.

Main Methods:

  • Review of normal eyelid anatomy and neurological innervation patterns.
  • Description of eyelid physiology and functional behaviors.
  • Categorization of abnormal lid functions based on excessive closure or opening.

Main Results:

  • Detailed explanation of eyelid anatomy, neurological innervation, and physiology.
  • Identification of key eyelid functions: protection and tear film maintenance.
  • Classification of abnormal lid functions into excessive closure (e.g., blepharospasm, ptosis) and excessive opening (e.g., retraction syndromes).

Conclusions:

  • Understanding normal eyelid function is essential for diagnosing and managing ocular and neurological disorders.
  • Abnormal eyelid function can result from central nervous system, peripheral nerve, or mechanical issues.
  • This chapter provides a framework for understanding the neurophysiology of eyelid control in health and disease.