Visual Sphere

All examinations and play situations need to be within the child's visual sphere. Although this is self-evident it is not always followed in assessment of vision. Measurements should not be close to the outer limit of the visual sphere but well within it. If it is large enough, measurements may be made at several distances from the child.

If a child's visual sphere has not been measured before, it can be assessed as one of the first things in the beginning of an assessment. The tester's face is a good stimulus. Other easily available stimuli are colourful toys. Hiding Heidi pictures measure visual sphere for communication but also depict visual sphere for observation of the environment.