A Modified Protocol for Color Vision Screening Using Ishihara.

Abstract:

INTRODUCTION:The Ishihara plates are commonly used as an initial occupational screening test for color vision. While effective at detecting red-green deficiencies, the color deficient subject can learn the test using different techniques. Some medical standards such as the European Aviation Safety Agency (EASA) require plate randomization and apply a stricter pass/fail requirement than suggested by Ishihara. This has been reported to increase the false positive rate up to ∼50%. METHOD:Two modifications to the Ishihara protocol are investigated. These involved allowing subjects a second attempt where one or two reading errors were made and the presentation of rotated Ishihara plates. RESULTS:A reduction of false positive rate to 5.9% was found. Correct identification of certain rotated Ishihara plates was not affected. DISCUSSION:By using a modified Ishihara protocol, fewer color normal subjects would require unnecessary advanced color vision examination. Further, additional safeguards would be in place to ensure that no subject with a color vision deficiency could pass the Ishihara test.

journal_name

Aerosp Med Hum Perform

authors

Chorley AC

doi

10.3357/AMHP.4257.2015

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

747-51

issue

8

eissn

2375-6314

issn

2375-6322

journal_volume

86

pub_type

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