ABSTRACT
Visual field assessment is the process by which the boundaries of the visual field are plotted and the field within the peripheral boundaries is determined to be intact. Assessment of the visual field has been undertaken in varying ways since the blind spot was first documented by Mariotte in the seventeenth century. The Friedmann perimeter was the first quantitative static measurement introduced in 1966 and assessed the central visual field. The visual field is produced by retinal stimulation of each eye and relates to what is seen by the individual whilst maintaining steady fixation, that is the perceived vision of an individual. A diffuse depression or constriction of the visual field can be caused by many conditions such as cataract, pupil miosis, glaucoma and incorrect refractive correction. A hemianopia is a defect involving one half of the visual field. The sensitivity of the visual field is expressed in luminance or light intensity units.
