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Prospective screening for thimerosal hypersensitivity: a pilot study.

A Gordon1

  • 1School of Optometry/The Medical Center, University of Alabama, Birmingham.

American Journal of Optometry and Physiological Optics
|March 1, 1988
PubMed
Summary
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Prospective patch testing for thimerosal hypersensitivity showed limited value in predicting ocular tolerance to contact lens solutions. The test was neither clinically valuable nor sensitive in this study sample.

Area of Science:

  • Ophthalmology
  • Allergy and Immunology
  • Contact Lens Technology

Background:

  • Thimerosal is a mercury-containing preservative used in some contact lens solutions.
  • Ocular hypersensitivity reactions to thimerosal can cause discomfort and affect contact lens wear.
  • Predictive screening methods for thimerosal hypersensitivity are needed to ensure patient safety.

Purpose of the Study:

  • To evaluate the clinical utility and sensitivity of prospective patch-test screening for predicting ocular tolerance to thimerosal-preserved contact lens disinfection systems.

Main Methods:

  • A pilot study involving 30 patients undergoing soft contact lens wear.
  • Patients were patch tested for thimerosal hypersensitivity prior to initiating lens wear.
  • Ocular tolerance to a thimerosal-preserved disinfection system was monitored over the study duration.

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Main Results:

  • Only one patient with a positive patch test developed ocular thimerosal hypersensitivity.
  • Two patients with negative patch tests also developed hypersensitivity reactions.
  • Prospective patch testing demonstrated low sensitivity and limited clinical value in this cohort.

Conclusions:

  • Prospective patch testing for thimerosal hypersensitivity is not a reliable predictor of ocular tolerance to thimerosal-preserved contact lens solutions.
  • Further research may be needed to identify more effective screening methods for thimerosal-related ocular reactions.
  • Current patch-test screening may not adequately identify all patients at risk for hypersensitivity.