Fig. 20. Neutralization retinoscopy: diagram of changes in characteristics of reflex as in the zone surrounding the point of neutrality. At neutrality, the reflex motion may be so fast that it cannot be detected. The end point or end zone should be approached from the “with” reflex side and the judgment of neutrality made erring toward the “with” reflex rather than the “against” reflex. *The point within the neutralization zone where neutralization is best observed. (After Weinstock SM, Wirtschafter JD: A Decision-Oriented Manual of Retinoscopy. Springfield, IL: Charles C Thomas, 1976.)