Sinister: blinkers?

"...because you're making blinkers fashionable..." Can anyone tell me what blinkers are? It struck me this week that I've been singing along to this line without knowing what they are, and why they would be unfashionable. Anyway, if I can make the effort I will try to translate a B&S article which appeared in today's "Volkskrant" (a Dutch paper). It's quite big, and apart from a few little mistakes quite good. Expect the results this Sunday. Koen