During Humphrey automated perimetry, a patient shows a high fixation loss rate of 25%. This is assessed using which test method?
- A Heijl-Krakau method (blind spot monitoring) ✓
- B False-positive catch trials
- C Short-term fluctuation analysis
- D False-negative catch trials
Correct answer: A. Heijl-Krakau method (blind spot monitoring)
Explanation
Fixation losses are measured by the Heijl-Krakau method, where stimuli are projected into the physiologically mapped blind spot; if the patient responds, fixation has shifted. False-positive catch trials present stimuli with no target. False-negative catch trials present suprathreshold stimuli. Short-term fluctuation measures test-retest variability at repeated points.
Reference: Humphrey Field Analyzer User Manual / Heijl and Patella, Essential Perimetry, 4th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.