Functional and simulated visual loss

Area of Science:

• Neurology
• Ophthalmology
• Psychiatry

Background:

• Nonorganic visual loss (NOVL) is a common reason for specialist referrals.
• It presents a diagnostic challenge at the intersection of neurology, ophthalmology, and psychiatry.
• NOVL is defined as visual impairment without an identifiable organic cause after thorough investigation.

Purpose of the Study:

• To outline diagnostic approaches for nonorganic visual loss.
• To detail methods for differentiating organic from nonorganic visual impairment.
• To describe the management strategy for patients diagnosed with NOVL.

Main Methods:

• Clinical examination and bedside maneuvers.
• Specialized testing including visual field testing, OCT, VEPs, ERG, and MRI.
• Exclusion of organic pathology through comprehensive investigation.

Main Results:

• Diagnosis relies on the absence of objective findings and confirmation of visual system integrity.
• Various clinical and specialized tests aid in distinguishing NOVL from organic causes.
• Successful diagnosis requires careful evaluation and exclusion of physical disease.

Conclusions:

• NOVL diagnosis is achievable through specific clinical and instrumental methods.
• Management involves patient reassurance, close monitoring, and psychiatric consultation.
• Patients with NOVL may have associated psychiatric conditions and are at risk for depression and anxiety.