Definition of Bjerrum screen

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PI Physik Instrumente - Microscope Stages LB ROS 11/24

Photonics Dictionary

Bjerrum screen: In ophthalmic practice, an instrument that determines the boundaries of the field of view. It is composed of a 2-m square of black velvet with a white spot center at which the patient, 1 m away, stares with one eye covered. The oculist, by moving a colored wand toward the square from different directions, can map the field of view.

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