Nonorganic Vision Loss (NVL) is established by the following:

• Demonstrating features of vision loss incompatible with organic disease
• Demonstrating that vision is better than reported

A history that does not comport well with the natural history of pathophysiologic processes or dysfunction not consistent with a reported injury are often the most meaningful reasons to suspect NVL. Some tests are helpful for evaluating decreased acuity in both eyes, while some are helpful if vision loss is reported in only one eye. When evaluating visual field complaints, Goldmann perimetry and tangent screen testing are indispensable for identifying nonorganic features.