Professional and Linguistic Assessments Board (PLAB) Practice Exam

Which type of paralysis is associated with homonymous quadrantanopias?

1. Upper limb paralysis

2. Lower limb paralysis

3. Quadrant visual field loss

4. Hemiplegia

The correct answer is: Quadrant visual field loss

Homonymous quadrantanopias refer to a specific type of visual field loss where a quarter of the visual field on the same side is affected in both eyes. This condition is commonly associated with lesions in the occipital lobe or along the visual pathways, particularly involving the optic radiations. In cases of homonymous quadrantanopia, the lesion is typically unilateral, resulting in the loss of vision in the same quadrant of both visual fields. This distinctive feature aligns with the concept of "quadrant visual field loss," making it the correct answer to the question. Understanding the visual pathway and how disruptions can lead to specific patterns of visual field loss is crucial in distinguishing this condition from other forms of paralysis, which do not directly correlate with visual field changes. In summary, the association of homonymous quadrantanopias with quadrant visual field loss highlights their connection, emphasizing the role of neurological structures involved in visual processing rather than motor function or limb paralysis.