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COLOURED GLASSES AND COLOUR VISION, WITH REFERENCE TO CAR DRIVING
Author(s) -
BERGGREN LENNART
Publication year - 1970
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1970.tb03755.x
Subject(s) - citation , information retrieval , computer science , library science
In Sweden there is no legal ban whatsoever against car drivers wearing coloured glasses. On the other hand, it is not permitted for subjects with colour defects of any kind to drive buses (4, 7) . These facts would clearly be in conflict with each other if there were a conceivable risk that coloured glasses might cause faulty colour reproduction. In the present investigation we have tried to analyze the question of the effect on colour vision by coloured glasses. Normal subjects were tested on their ability to do an anomaloscopic colour match with different kinds of coloured glasses. Their ability to interpret pseudoisochromatic plates was also investigated. It is generally believed and implied that coloured glasses (sun glasses) of good quality reproduce natural colours, i. e. that visible radiation is transmitted as evenly as possible. Ultraviolet and infrared rays should be absorbed as much as possible. I t was surprising and unexpected to find out that coloured glasses even from well-known manufacturers were not regularly sold with a transmission spectrum or a relevant description of the characteristics of the glasses in question. The glasses were claimed to reproduce natural colours and an information of an average percentage figure of absorption was also given. Such a figure suggests an even transmission and is misleading if that is not the case. Apparently there seems to be little demand for exact information of transmission properties and the perfection of the glasses is taken for granted. Use of coloured glasses. The main purpose of coloured glasses is to prevent