Effects of head tilt on visual field testing with a head-mounted perimeter imo

AI Generated Summary*

Ocular counter-roll (OCR) from head tilt was assessed as an error source for the head-mounted imo perimeter, which moves with the head. In 20 healthy adults (40 eyes, mean age 33.7 years), static OCR was measured from iris patterns at tilts up to 60\, tilts up to 60 degrees, and blind spots were mapped at tilts up to 50 degrees. Torsion and blind spot rotation, both opposite to the tilt, rose sinusoidally with tilt angle and correlated strongly with each other (R-squared 0.94 per eye); OCR compensated at most roughly 20% of tilt. Torsion stayed under the 6.34 degree threshold for peripheral test point interference in all subjects at 20 degrees but exceeded it in about half at 50 degrees, so the authors advise limiting head tilt to 20 degrees.

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