Snellen defined standard vision as the ability to recognise a letter (âoptotypeâ) when it forms an angle of 5 arcminutes, which is âline nineâ of the letters (âoptotypesâ) on the chart at 6 metres. Hermann, Dutch ophthalmologist, 1834-1908.
In the context of the theory of Marxist revolutionary struggle, vanguardism is a strategy whereby the most class-conscious and politically advanced sections of the proletariat or working class, described as the revolutionary vanguard, form organizations in order to draw larger sections of the working class towards revolutionary politics and serve as manifestations of proletarian political power against its class enemies.
Revisionist Zionism is a faction within the Zionist movement. It is the founding ideology of the non-religious right in Israel, and was the chief ideological competitor to the dominant socialist Labor Zionism. Revisionism led to the development of the Likud Party. The ideology was developed originally by Ze'ev Jabotinsky, who advocated a revision of the practical Zionism of David Ben-Gurion and Chaim Weizmann, which was focused on independent individuals settling of Eretz Yisrael.