Fig. 11. A typical contrast sensitivity function plotted for a normal subject (N) and a cataract subject (C). The test was repeated (dotted lines) with a superimposed glare source. (Sjostrand J, Abrahamson M, Hard AL: Glare disability as a cause of deterioration of vision in cataract patients. Acta Ophthalmol (Copenh) 65: 103. 1987)