Visual Field Defects

The visual field is the portion of the subject's surroundings that can be seen at any one time. The normal extent of field of vision is 50 superiorly, 60 nasally, 70 inferiorly and 90 temporally. A visual field defect is a loss of part of the usual field of vision, so it does not include blindness of either one eye or both. The lesion may be anywhere along the optic pathway; retina to occipital cortex.


There are many causes of visual field loss. Some more common ones are included here. Central field loss occurs with: Age-related macular degeneration. Optic neuropathy. Macular holes. Cone dystrophies. A number of rare conditions like Best's disease, Stargardt's disease and achromatopsia. Peripheral field loss occurs with: Glaucoma (angle-closure glaucoma and open angle glaucoma). Retinal detachment. Retinitis pigmentosa. Chorioretinitis. Leber's optic atrophy. Looking for evidence of 'asymptomatic' visual field loss.

Does the patient tend to bump into people or things

Has there been any damage to the car recently Patients may continue to drive, as they are oblivious of quite significant field loss. This can cause failure to judge parking, failure to negotiate obstacles or failure to notice other vehicles at road junctions. There may be remarkable lack of insight despite numerous claims on the insurance.