Von Frey Hair Aesthesiometer

Von Frey Hair Aesthesiometer

1st Apr 2015

The Von Frey style aesthesiometer is a device that measures the feeling thresholds (tactile sensitivity) of human skin using hairs (or monofilaments) of varying diameter. The device is named after Maximilian von Frey, an Austrian-German physiologist who in 1896 performed experiments that discovered “pain spots,” or areas of the skins that are sensitive to pain and touch. His work contributed to our current understanding of nerve impairment and evaluation.

BASELINE TACTILE SEMMES-WEINSTEIN SENSORY MONOFILAMENT SETBASELINE TACTILE SEMMES-WEINSTEIN SENSORY MONOFILAMENT SET

Max Von Frey charted responses to hair monofilaments to test tactile sensitivity.

Von Frey’s work was instrumental in developing what has become the modern-day version of the monofilament aesthesiometer, a series of fine plastic “hairs” that have progressively stronger bend strengths. The buckling force required to bend each monofilament is calibrated so that sensitivity tests can be normalized and compared from patient to patient.

WEST-D MONOFILAMENT TACTILE SENSITIVITY TEST

The Von Frey Hair Aesthesiometer was an early version of the monofilament aesthesiometers used for testing tactile sensitivity and nerve impairment.

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