Detection of nonorganic visual loss with a new optotype chart in simulated malingerers.

Background: We tested a new distance and pocket optotype chart for detection of nonorganic symmetrically decreased vision in simulated malingerers. The new optotype used in the charts is based on a subjective contour formed by a misalignment of two line segments. The minimum angle of resolution of this optotype is independent of its size.

A new optotype chart for detection of nonorganic visual loss.

Objective: To develop a new optotype chart for detection of nonorganic decreased vision.

Design: Comparative observational case series.

Participants: Optotype thresholds determination in three normal subjects and testing on 30 consecutive patients with unclear visual acuity loss.