A STANDARDIZED LANTERN FOR TESTING COLOUR VISION

A Standardized Colour-vision Testing Lantern (ii) Transport Type.

THE purpbse of this note is to describe a modification of the standardized colour vision testing lantern designed by the present writer (Martin, 1939), which should render it specially suitable for use by. transport undertakings. Experience has shown, however, that the mariner's test was a very satisfactory one in itself. Therefore the modifications are supplementary, and the marine form of the...

Comparing Colour Vision Testing Responses of Edridge Green Lantern with Anomaloscope

Dr. Punita K soDhi: MBBS (1991) and MS (1995), both from University College of Medical Sciences, Delhi; DNB (2001), National Board of Examinations, New Delhi. Recipient of (i) Best Poster Award in SAARC (2008), (ii) Best Paper Award (1998), Oculoplastic Association of India. Presently, Prof. in Ophthalmology, Guru Nanak Eye Centre and Maulana Azad Medical College, New Delhi. Email: sodhipunita@...

Can clinical colour vision tests be used to predict the results of the Farnsworth lantern test?

Clinicians usually do not have access to a lantern test when making an occupational assessment of the ability of a person with defective colour vision to recognise signal light colours: they must rely on the results of ordinary clinical tests. While all colour vision defectives fail the Holmes Wright Type B lantern test and most fail the Holmes Wright Type A lantern, 35% of colour vision defect...

Colour-Vision and Colour-Blindness

Colour vision

The immense range of colours that we see belies the relative simplicity of the system underlying colour vision. We see colours because each of the three distinct types of cone photoreceptor in our retinae is sensitive to a different range of wavelengths of light. The L, M and S cones, colloquially called red (R), green (G), and blue (B), are selective for long, middle and short wavelengths, res...