Which option correctly matches Hertel exophthalmometry ranges by ethnicity?

Which option correctly matches Hertel exophthalmometry ranges by ethnicity?

• A. Caucasian: 12-22; Asian: 12-18; African American: 12-24
• B. Caucasian: 12-22; Asian: 12-20; African American: 12-24
• C. Caucasian: 10-22; Asian: 12-18; African American: 12-26
• D. Caucasian: 12-20; Asian: 12-18; African American: 12-24

Answer: (A)

Normal Hertel exophthalmometer readings vary by ethnicity because orbital anatomy and facial structure influence how far the globe sits forward. Using ethnicity-specific reference ranges helps distinguish normal variation from true exophthalmos. The commonly cited values are: Caucasian 12 to 22 mm, Asian 12 to 18 mm, and African American 12 to 24 mm. The option that matches these ranges is the one listing Caucasian 12-22, Asian 12-18, and African American 12-24. Remember that readings are still interpreted in the context of age, measurement technique, and individual variation.

Normal Hertel exophthalmometer readings vary by ethnicity because orbital anatomy and facial structure influence how far the globe sits forward. Using ethnicity-specific reference ranges helps distinguish normal variation from true exophthalmos. The commonly cited values are: Caucasian 12 to 22 mm, Asian 12 to 18 mm, and African American 12 to 24 mm. The option that matches these ranges is the one listing Caucasian 12-22, Asian 12-18, and African American 12-24. Remember that readings are still interpreted in the context of age, measurement technique, and individual variation.