campimetry การใช้

• Later he became an assistant to Jannik Petersen Bjerrum ( 1851-1920 ), with whom he performed important studies in campimetry.
• In 1875, Hirschberg coined the term " campimetry " for the measurement of the visual field on a flat surface ( tangent screen test ) and in 1879 he became the first to use an electromagnet to remove metallic eye.