By GR Reddy

ISBN-10: 8180616568

ISBN-13: 9788180616563

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Only the numerical values of the retinal sensitivity is displayed in the raw data and the dB units are omitted. ) The numerical 40 indicates response to 1 asb unit. The numerical 40 is the highest retinal sensitivity that can be recorded by the Humphrey field analyzer because 1 asb unit of light intensity is the dimmest light that can be projected by Humphrey field analyzer. In the same patient the raw data calculated by different strategies is not exactly similar. That is why, for follow-up tests we also select the same strategy what was used for the previous test.

That is why, for follow-up tests we also select the same strategy what was used for the previous test. Then only the result of the latest test will be compared with the previous tests. 4 we can not tell whether the measure retinal sensitivity is normal or decreased since we do not know the normal sensitivity value at that point. As the computer stores the mean normal value of each point, the raw data will be compared with the mean normal value and calculates the difference between measured retinal sensitivity and the mean normal retinal sensitivity at all points and plot them as total deviation numerivcal plot.

False Negative Response Failure to respond to the brightest stimulus in an area previously determined to have some sensitivity is a false negative response. High false negatives may indicate lack of attentiveness, fatigue or hypnosis. In general greater than 20% rate of false negative response is considered to be abnormal though the machine defaults to 33%. Fields should not be considered unreliable solely upon a false negative response rate, particularly if there is a great deal of pathology. In patients with advanced glaucomatous optic nerve damage we may get more than 50% false response which can be attributed in small shifts in fixation.

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A Visual Evaluation with Automate Devices by GR Reddy


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