Stillings pseudo-isochromatische Tafeln zur Prüfung des Farbensinnes.

  • Jakob Stilling
Date:
1929
Catalogue details

Licence: Public Domain Mark

Credit: Stillings pseudo-isochromatische Tafeln zur Prüfung des Farbensinnes. Source: Wellcome Collection.

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    of about 1 metre. (Test varies in aiftieulty according to strength of the light.) Note points of delay, or markeäleffort in looking for the mnmpbers; turning from side to side, bringing the tests nearer. If a subject fails in one of tie tables of Groups 3 - 15, defect is pronounced, espeflally if tnere are mistakes in other tables also. Normal subjects may make errorst in this event, compare with the same figure in otkler tables and return to the error. It is possible to ask the subjett to trace the numbers with a rod: in some cases, it isuseful to ask subject to trace the beginning and the end of the number. In cases of doubt, a sheet of vaper with a cireular hole 2=3 cm. in diameter may be Used. The subject is asked whether he sees, inside the exposed area, dots of the same or of different colours;” how many of them,-of which colour. This method is ildependent of the use of figures.
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