The eye care specialists have developed images of four famous glasses wearers in the style of the
Ishihara plate test, which is used to identify colour vision deficiency.
* Colour discrimination was assessed monocularly by Holmgren wool test,
Ishihara plate test, and the Farnsworth-Munsell 100 (FM 100) Hue test under appropriate lighting condition.
Each subject was tested for CVD using
Ishihara plates. Association of gender with CVD was insignificant using Chi square test.
Best ever diagnosis of colour-blindness is using
Ishihara Plates.
Ishihara Plates were designed in 1917 and still are gold standard to diagnose this condition.
(26) Applicants that fail the
Ishihara plates and deutans that pass the Farnsworth D15 test without error were accepted.
It has been suggested that heterozygous women might be identified by a small number of errors on the
Ishihara plates or by a large number of 'misreadings': this is not the case.
Ishihara plates consist of a series of cards in which a colored background is printed in spots of different sizes (7).
Until recently, a failure on the
Ishihara plates would have indicated the need for a Holmes Wright Lantern test to assess whether the applicant can recognise the colours used in aviation.
As many as 40-45% (16,18) of adults with normal colour vision make at least one misreading on the
Ishihara plates. The percentage of children who make at least one misreading is even higher.