Which statement about complete visual field defects is accurate?

Which statement about complete visual field defects is accurate?

• A. They are easy to localize
• B. They are difficult to localize
• C. Localization is not possible
• D. They have no clinical relevance

Answer: (B)

Localization is difficult. When the entire visual field is lost, there isn’t a distinctive pattern that pinpoints a single spot along the visual pathway. Complete field losses can result from a range of sites—from retina and optic nerve up to more central pathways—so the perimetric finding alone doesn’t reliably indicate where the lesion lies. In contrast, partial defects that create specific patterns (like altitudinal losses or homologous field losses) tend to offer clearer localization clues. Therefore, a complete visual field defect is not easy to localize and typically requires additional signs and testing to determine the exact site.