Which of the following does NOT measure a patient's subjective angle when determining anomalous correspondence?

• A. Bagolini striated lenses
• B. HBAIT
• C. Major amblyoscope
• D. Red lens test

Answer: (B)

Understanding anomalous correspondence involves knowing how the patient’s perceived alignment (subjective angle) compares to the actual eye alignment (objective angle). Tests that reveal the subjective angle rely on the patient’s report of how images fuse or line up.

Bagolini striated lenses let the patient see faint lines that should appear to coincide if fusion is normal. The way the lines from each eye appear to the patient indicates their subjective alignment, making this test informative about anomalous correspondence.

The red lens test uses a red filter to dissociate the images, so the patient’s perception of where the targets line up provides a direct readout of the subjective angle. It’s another way to gauge how the brain fuses these images, signaling anomalous correspondence if the perceived alignment differs from the actual alignment.

The major amblyoscope (synoptophore) is designed to find the orientation where fusion is achieved by presenting targets to each eye and adjusting until the patient reports single vision. The angle at which that fusion occurs reflects the subjective angle the patient uses, giving a clear measure of anomalous correspondence.

HBAIT, on the other hand, is a test that assesses binocular status or balance through dichoptic presentation and often relies on objective or threshold responses rather than the patient’s explicit report of alignment. It does not provide a direct readout of the subjective angle, so it does not measure this aspect of anomalous correspondence.