Fig. 10. Finger-mimicking fields in a 3-year-old boy. A press-on occluder may be used for monocular testing. A. Child and examiner face each other with both hands poised. B. With child fixating examiner's face, a number of fingers (1, 2, or 5) is “flashed.” C. The child responds. D. When fixation is a problem, the face may be turned such that the abducted eye can move no farther to the side.