The left side parallels the normal range and represents the diffuse loss. The entire curve is depressed below normal range. An example of combined localized and diffuse damage. Most of the curve falls within the normal range however, a sharp decline is measurable at the higher ranks. This non-invasive test examines your fields of vision, and it is important for identifying vision problems that could be signs of eye disease or conditions that affect the brain (like a stroke). Also, the decibel scale is directly related to sensitivity i.e, areas of higher sensitivity on the Hill of Vision. The Bebie curve of a patient with purely localized damage. Visual field was measured for each eye by using a Zeiss Humphrey Field Analyzer (Carl Zeiss Binocular field estimation was calculated from the visual field of each individual eye according to a. A visual field test is part of a comprehensive eye exam and part of a neurological examination. The Bebie curve is shifted inferiorly but parallels the normal range. Analysis of reliability indices from Humphrey visual field tests in an urban glaucoma population. The Bebie curve of a patient with diffuse damage. For each sensitivity (decibel) level, the standard. The curve lies completely within the normal shaded area. The normal range, between the 5th and 95th percentiles, is shaded. The y axis represents the magnitude of the defect. The x axis represents the rank of the defect from smallest (left side) to largest (right side). The curve is a graphic ranking of the defect (the difference between the measured threshold and the age-corrected normal threshold) for each point in the visual field. Later, we describe in detail the interpretation of Humphrey perimetry. Bebie, or cumulative defect, curves are useful in detecting diffuse depression of the visual field. The Humphrey Visual Field is a special automated procedure used to perform perimetry, a test that measures the entire area of peripheral vision that can be. The Humphrey field analyser is by far the most commonly used for automated static perimetry, although there are also other machines such as Octopus and Henson. 3.3 Interpretation of a Visual Field Defect 3.3.1 Understanding a Humphrey Visual Field Printout Humphrey perimetry uses computerized programs to randomly test points in the patient’s central visual field with a standard stimulus size but varying stimulus intensities ( Fig.

Decibel scale humphrey visual filed