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The RailCorp Lantern test.

A Casolin1, P L Katalinic, G S-Y Yuen

  • 1RailCorp., PO Box K349, Haymarket, NSW 1238, Australia. armand.casolin@railcorp.nsw.gov.au

Occupational Medicine (Oxford, England)
|April 29, 2011
PubMed
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The RailCorp Lantern (RL) test effectively identifies workers safe for railway signal duties, unlike the Farnsworth Lantern (FL). This color vision test shows significant differences in pass rates and error types for protan and deutan deficiencies.

Area of Science:

  • Ophthalmology
  • Occupational Health
  • Transportation Safety

Background:

  • The RailCorp Lantern (RL) is a novel simulation of light-emitting diode (LED) railway signals.
  • It was developed to provide a practical and consistent color vision test for railway workers.

Purpose of the Study:

  • To analyze errors made on the RL test.
  • To correlate RL test errors with specific color vision deficiency diagnoses.
  • To compare RL test results with established color vision tests.

Main Methods:

  • A retrospective audit of 207 RL tests conducted between February 2006 and December 2008.
  • Comparison of results from RL tests at 3m (RL3) and 6m (RL6) with the Standard Farnsworth-Munsell D15 (D15) and Farnsworth Lantern (FL).

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Main Results:

  • Significant differences in pass rates were observed: D15 (57%), FL (14%), RL6 (26%), and RL3 (47%).
  • Both deutan and protan individuals struggled most with the white light on the FL and yellow on the RL.
  • Protan individuals showed a higher rate of red omissions (79% at 6m, 23% at 3m) compared to deutans (33% at 6m, 3% at 3m).

Conclusions:

  • The RL test accurately identifies individuals capable of safely reading railway signals.
  • The RL test identifies individuals who might have been excluded from work if the FL was the sole assessment.
  • Consideration of the RL test for adoption by other rail operators is recommended.