A lantern color vision test for the rail industry.

Abstract:

BACKGROUND:Correct identification of wayside signal colors is critical for safe operation of railway equipment. However, evaluating color discrimination using just a screening test may not be occupationally relevant. METHODS:A lantern test (CNLAN) was designed to provide a functional assessment of color discrimination for the rail industry. It was validated against a simulated field trial. 81 individuals with normal color vision and 74 individuals with congenital red-green defects participated. Color vision was classified using the Nagel Anomaloscope. RESULTS:Using a criterion based on the worst-normal performance, 97% of the individuals with a color vision defect failed both the CNLAN and simulation trial. This value is slightly lower than the 100% who failed both the Ishihara test and simulation. However, the Ishihara test also failed 3.7% of the color-normals who passed both the simulation and lantern, whereas by definition none of the color-normals failed the lantern. CONCLUSIONS:This lantern test provides a reasonable functional assessment of one's ability to identify rail signal colors; especially when a strict failing criterion is applied to screening tests.

journal_name

Am J Ind Med

authors

Hovis JK,Oliphant D

doi

10.1002/1097-0274(200012)38:6<681::aid-ajim8>3.0.c

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

681-96

issue

6

eissn

0271-3586

issn

1097-0274

pii

10.1002/1097-0274(200012)38:6<681::AID-AJIM8>3.0.C

journal_volume

38

pub_type

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