Twelve subjects were able to fabricate a variety of convincing and potentially serious visual field defects. Furthermore, using a more detailed threshold test, it was still possible to fabricate convincing field defects that were highly reproducible. Automated perimetry should not be relied upon to ...
Visual field defect, a blind spot (scotoma) or blind area within the normal field of one or both eyes. In most cases the blind spots or areas are persistent, but in some instances they may be temporary and shifting, as in the scotomata of migraine headac
vis·u·al field de·fect (vizh'ū-ăl fēld dē'fekt) Specific types of vision loss due to problems in the eye itself or the brain. Medical Dictionary for the Health Professions and Nursing © Farlex 2012 Want to thank TFD for its existence?Tell a friend about us, add a link to...
The causes of a visual field defect can greatly vary. Often, there are certain causes associated with the various types of defects. For example, a peripheral visual field defect could be caused by glaucoma or retinal detachment. If there is a central field defect, this could be caused by ma...
This test is most often used to detect central visual field defects. Static automated perimetry (such as Octopus or the Humphrey Field Analyzer): Pinpoint flashes of light of varying size and brightness are projected within a large white bowl. The patient is asked to look at the center of...
We compared the automated visual field test results of 24 patients with normal-tension glaucoma and 24 patients with high-tension glaucoma who were closely matched for the amount of visual field loss to determine any differences in the characteristics of visual field defects between the two groups....
Complete visual-field loss The causes of complete or generalised VF loss can be divided into three categories. The first group of disorders causing generalised VF defects are pre-retinal, including ptosis of the eyelid, cataract, vitreous haemorrhage and other media opacities. Visual electrodiagnostic...
(1) A perimetry test was used to measure the visual responsiveness of discrete regions in the visual field of 2 normal, 4 monocularly deprived (MD) and 2 binocularly deprived (BD) cats. One of the MD cats as an adult underwent a reverse suture operation which forced it to use its fo...
To determine visual field defects in a cohort of children with congenital glaucoma. Monocular visual fields were measured in 24 meridians for targets V4e, I4e, I2e, and I1e, using a Goldmann perimeter in a group of 13 children between the ages of 4 and 14 years with congenital glaucoma...
A study of correlation of visual field changes by Humphrey's automated field analyser with Retinal Nerve Fiber Layer (RNFL) defects on optical coherence tomography (OCT) in Primary Open Angle Glaucoma (POAG) Humphrey's visual fields test showed an advanced glaucomatous visual field defect in his ...