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Visual hallucinations associated with low contrast sensitivity

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Low contrast sensitivity is a strong predictor of visual hallucinations in patients with low vision, a study found.

Mary Lou Jackson, MD, of the Massachusetts Eye and Ear Infirmary, and colleagues measured visual parameters and self-reported visual hallucinations in 225 adult patients referred to a low-vision rehabilitation clinic for a full calendar year.

A total of 78 patients (35%) reported experiencing visual hallucinations. The researchers found a strong association between low contrast sensitivity and hallucinations after controlling for visual acuity, age, sex, depression and independence.

The study is published in the March issue of the British Journal of Ophthalmology.