The Hunterian Lectures On Colour Vision And Colour Blindness Delivered Before T

Cover The Hunterian Lectures On Colour Vision And Colour Blindness Delivered Before T
The Hunterian Lectures On Colour Vision And Colour Blindness Delivered Before T
Frederick William Edridge Green
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If a person with considerable shortening of the red end of the spectrum is shown a pink which is made up of a mixture of red and violet, the red consisting of rays occupy- ing the missing portion of the spectrum, only the violet is visible to him, and so the pink appears a violet without a trace of red. This pink is there- fore matched with a violet or blue very much darker than itself.
ON COLOUR-VISION 37 Mistakes which are due to shortening of the spectrum may be remedied if we subtract the r
...ays occupying the missing portion from the colour of confusion. For instance, if we take a blue and a pink which have been put together as identical by a person with a shortened red end of the spectrum, and look at them through a glass w^hich is opaque to the red, but transparent to the remaining rays of the spectrum, both will appear alike in hue and shade. A person with considerable shortening of the red end of the spectrum will look at a red light (which is so dazzlingly bright to a normal-sighted person as to make his eyes ache after looking at it closely for a few seconds), at a distance of a few inches, and remark that there is nothing visible, and that the whole is absolutely black.

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