Visual Field Localiser

Tap a numbered site on either side of the pathway to add a lesion. Tap again to make it complete, and again to remove it. Several lesions combine. Fields are drawn as the patient sees them, left eye on the left; the plots show either the central 30° or the full field.

Quiz: work out where the lesion is from the patient's view alone, then tap that site on the pathway.

OPTIC NERVES TRACTS LGN LGN

    Each field pair shows what that site contributes. Highlighted pairs are active and add up to the combined fields; the badges show the side of the lesion, pale for partial and solid for complete. Faded pairs preview a right-sided lesion. In the central 30° view a thick rim marks loss that lies further out. Congruity rises the further back the lesion: fibres from matching points in the two eyes lie closer together as they approach the occipital cortex.

    Combined fields

    The sum of the highlighted field pairs.

    No lesions. Tap a number on the pathway to add one.

    Congruity

      Case 1

      Patient view Drag the red ring to move fixation. The defect moves with the eye.

      Vision is sharp at fixation and blurs evenly in every direction into the periphery, following the hill of vision. Only lesions remove vision: a defect is filled with the average colour of what it hides, so the area drops out. The physiological blind spot is not shown, so nothing normal can be mistaken for a defect. In full screen, switch eyes with the LE, BE and RE buttons or the L, B and R keys. The clinician photo is AI-generated and spans about 88°, so the raised fingers sit near 27° from fixation. The street and grid span 200°, your own photo about 120° and the reading card 60°.