True or False: Every patient tested should have a nonseeing area in their visual field.

• A. TRUE
• B. FALSE
• C. Not always
• D. Depends on age

Answer: (A)

The main idea here is that there is a natural nonseeing area in each eye's visual field due to the physiological blind spot where the optic nerve exits the retina. Since that spot lacks photoreceptors, every eye inherently has a small area in the visual field that cannot be seen. On visual field testing, this blind spot is expected to appear, even though people don’t notice it in daily vision because the brain fills in gaps and both eyes’ fields overlap. So the statement is true: a nonseeing area is a normal finding in visual field testing for every patient. Additional nonseeing areas beyond the physiologic blind spot would suggest pathology, but the existence of at least one nonseeing area is normal.