Tunnel vision: functional (ie, tubular field) versus physiological.

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Presentation transcript:

Tunnel vision: functional (ie, tubular field) versus physiological. Tunnel vision: functional (ie, tubular field) versus physiological. The optics of light is such that at a constant visual angle, the size of the field appears larger when further away. When examined at 4 m (with a proportionately larger target for acuity), the size of field to confrontation should be larger than on examination at 1 m. Thus, a ‘tubular’ field, where the size of field is unchanged, suggests functional overlay. Sui H Wong, and Gordon T Plant Pract Neurol 2015;15:374-381 ©2015 by BMJ Publishing Group Ltd