Head · Medical · Specialist
Head To Tragion
The distance from the head to the tragion point.
HeadToTragion
How to measure
Application
Used in eyewear temple arm design and headset positioning to determine the horizontal distance from the ear to the front of the face.
Posture
Head level, looking straight ahead.
Landmark
The tragion is the small notch at the top of the ear canal opening. Measured from this point to the most forward point of the face at the same height.
Tool
Tape measure or spreading caliper.
Assistance
A second person should locate the tragion and hold the tape end in place.
Common mistake
Measuring from the outer edge of the ear rather than the tragion notch inflates the result.
API example
Request a predicted value for a 34-year-old woman at the 50th percentile in the United States. Adjust age, percentile, gender, and country to match your design scenario.
POST https://api.humanform.app/v1/predict
Authorization: Bearer hf_live_...
Content-Type: application/json
{
"measurement": "HeadToTragion",
"gender": "Female",
"age": 34,
"percentile": 50,
"country": "US",
"unit": "cm"
}Response values depend on age, percentile, gender, and country. Create a free dashboard account to run live predictions.
See design examples for worked scenarios that combine multiple measurements, or read the methodology page for percentile-based design thinking.
Explore the dataset
Humanform covers 148 measurements with country-adjusted predictions and separate female and male profiles. Browse the full inventory or read the API reference for request syntax.