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G-Protein Gated Ion Channels

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Updated: May 11, 2026

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients
04:00

Corneal Sensitivity Testing Procedure for Ophthalmologic and Optometric Patients

Published on: August 2, 2024

Which neurotransmitters modulate corneal sensitivity?

D J O'Leary1, J Nazarian, M Millodot

  • 1Cornea and Contact Lens Research Unit, School of Optometry, University of New South Wales, Sydney, AustraliaLaboratory of Experimental Optometry, UWIST, Cardiff, UK.

Clinical & Experimental Optometry
|May 30, 2013
PubMed
Summary
This summary is machine-generated.

This study found atropine decreased corneal sensitivity, while parasympathomimetics increased it, suggesting acetylcholine plays a role in corneal nerves. Potassium chloride had no effect.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Pharmacology

Background:

  • Corneal sensitivity is crucial for ocular surface protection.
  • The role of neurotransmitters in corneal sensation is not fully understood.
  • Acetylcholine is a potential neurotransmitter in the cornea.

Purpose of the Study:

  • To investigate the effects of various drugs on corneal sensitivity.
  • To explore the potential role of acetylcholine as a corneal neurotransmitter.

Main Methods:

  • Corneal sensitivity was measured before and after topical application of atropine, pilocarpine, eserine, and potassium chloride.
  • Dose-response effects were evaluated for each agent.

Main Results:

  • Atropine (0.5-0.005%) significantly reduced corneal sensitivity.
  • Parasympathomimetic agents (pilocarpine, eserine) significantly increased corneal sensitivity.
  • Potassium chloride (171mM) exposure did not alter corneal sensitivity.

Conclusions:

  • The findings support the hypothesis that epithelial acetylcholine acts as a neurotransmitter to corneal nerves.
  • Corneal nerves appear to possess only weak muscarinic properties.