an apparatus for performing assessments of field of vision that is portable , does not require the patient to adopt a particular posture or position relative to the testing device and may be operated so as to require minimal active responses from the patient is disclosed . the invention includes a patch , cover , or other device designed to occlude from ambient light and visually stimulate the subject eye . the interior of the patch facing the occluded eye includes an array of light sources , such as leds or lcd pixels , selective and sequential illumination of each source being controlled electrically by the practitioner , either manually or via a computer controller . the close proximity of the light sources to the eye being tested also minimizes anomalous results arising from poor visual acuity .