Professional and Linguistic Assessments Board (PLAB) Practice Exam

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What mnemonic is commonly used for homonymous quadrantanopias?

PITS
MAPS
SPOT
FLAP

The correct answer is: PITS

The mnemonic "PITS" is used to help remember the characteristics of homonymous quadrantanopias, which are visual field defects that occur in the same quadrant of both eyes due to lesions in the visual pathways. The mnemonic stands for "Parietal" and "Temporal," indicating that lesions in the parietal lobe can result in contralateral (opposite side) upper quadrantanopia, while lesions in the temporal lobe can result in contralateral lower quadrantanopia. Understanding this relationship aids in diagnosing and localizing brain lesions that cause specific visual field defects. For instance, a stroke in the right parietal lobe can lead to a loss of the upper left quadrant of the visual field in both eyes, while a lesion in the right temporal lobe might result in loss of the lower left quadrant. This distinction is critical for clinicians in both assessment and treatment planning. Other mnemonics like "MAPS," "SPOT," and "FLAP" do not pertain specifically to homonymous quadrantanopias and do not provide the same direct connection to the underlying anatomical and functional relationships involved in visual field loss.