The hfa ii printout

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Transcript

  • 1. Humphrey Field Analyzer II/IIi
  • 2. The HFA II Printout What does it all mean??
  • 3. Patient Data/Test Parameters Eye Tested Type of Test Date of Test Time of Test Fixation Monitoring Patient Name Patient DOB Pupil Diameter Visual Acuity Glasses Prescription Age
  • 4. Reliability Indicators Fixation Losses False Positive Errors False Negative Errors Gaze Tracking
  • 5. Raw Numeric Thresholds
    • Numeric Values for Each Data Point
    • Can look for low or high values or pattern of loss
  • 6. Grey Scale Plot
    • Grey Scale representation of Numeric Data
    • Not Age Corrected
  • 7. Total Deviation Plot
    • Total Deviation Probability Plots show all locations that are outside of normal limits
    • Threshold Sensitivity is compared at each point with Age-corrected Normal values . The difference is shown on the Total Deviation Decibel Plot.
    • Negative Values – Below Median Age Corrected Sensitivities
    • Positive Values – Above Median Age Corrected Sensitivities
    • Probability Plot shows points that are worse than those found in 5%, 2%, 1% and 0.5% of normal patients of same age.
  • 8. Pattern Deviation Plot
    • Single Most Useful Analysis (Heijl/Patella)
    • Shows Sensitivity loss after an adjustment has been made to remove any generalized depression (i.e. Cataract) .
    • Negative Values – Below Median Age Corrected Sensitivities.
    • Positive Values – Above Median Age Corrected Sensitivities.
    • Probability Plot shows points that are worse than those found in 5%, 2%, 1% and 0.5% of normal patients of same age.
  • 9. Mean Deviation
    • Mean deviation (MD) shows how much, on average, the whole field departs from normal and is a weighted average of the decibel deviations shown in the total deviation plot.
    • Normal Zero to - 2 dB
    • More negative value as Visual Field worsens
    • P values are shown next to MD values that are significantly outside the normal range.
  • 10. Pattern Standard Deviation
    • Pattern standard deviation (PSD) reflects irregularities in the field, such as those caused by localized field defects.
    • Normal Zero to 1 dB
    • More positive value as Visual Field worsens
    • P values are shown next to PSD values that are significantly outside the normal range.