2 months through 8 years (C&TC) or 3rd grade (Early Childhood and school screenings). Description : By noting the position of light being reflected in the pupils, the observer is able to check for a less obvious constant strabismus.
Preferential voting may refer to: 1  Ranked voting systems, all election methods that involve ranking candidates in order of preference. 2  Instant-runoff voting, referred to as preferential voting in Australia, is one type of ranked voting system.3  Range voting, in which voters assign points to each candidate. Ranked voting systems, all election methods that involve ranking candidates in order of preference. 2  Instant-runoff voting, referred to as preferential voting in Australia, is one type of ranked voting system. 3  Range voting, in which voters assign points to each candidate.
This article is about voting systems that use ranked ballots. For voting systems that use ballots rated on the interval scale, see cardinal voting systems. Preferential voting or rank voting describes certain voting systems in which voters rank outcomes in a hierarchy on the ordinal scale.When choosing between more than two options, preferential voting systems provide a number of advantages over first-past-the-post voting (also called plurality voting).his does not mean that preferential voting is always the best system; Arrow's impossibility theorem proves that no method can simultaneously obtain all properties desirable in a voting system.