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Br J Ophthalmol 77:339-343 doi:10.1136/bjo.77.6.339
  • Research Article

Investigation of limbal touch sensitivity using a Cochet-Bonnet aesthesiometer.

  1. J G Lawrenson and
  2. G L Ruskell
  1. Department of Optometry and Visual Science, City University, London.

      Abstract

      Following the observation of complex sensory receptors concentrated within the palisade zone of the human conjunctiva, this study sought to measure limbal touch sensitivity using a Cochet-Bonnet aesthesiometer. Touch sensitivity was found to be significantly higher in the palisade zone compared with the adjacent conjunctiva. A comparison between temporal and inferior limbus showed a greater median sensitivity for the temporal zone. There was a significant reduction in touch sensitivity with age, but not with iris colour or contact lens wear. These data, showing a higher touch sensitivity for the palisade zone, provide indirect evidence for a role of complex nerve endings in mechanoreception.