Which of the following is not a source of error in the applanation tonometry:: (A) High Pressure on the globe, (B) Tear film, (C) Astigmatism, (D) Wide pulse pressure
Answer is B. Tear film is required for accurate measurement , is not a source of error. Sources of error in tonometry: Inappropriate fluorescein pattern. Pressure on the globe. Central Corneal thickness. Corneal edema. Pulse pressure. Astigmatism. Incorrect calibration. Wide pulse pressure.