[Protective sunglasses and color discriminating ability]

The influence on color vision of 4 kinds of sun-glasses with various characteristics of transparency and absorption of 25, 50, 75 p.c. was evaluated. Sixty persons with normal color discrimination took part in investigation. The selection of filters for professional drivers and railway engine-drivers was performed on the basis of Nagel's anomaloscope and Farnworth-Munsell's 100--Hue tests.