Bjerrum felt that mapping the subtleties of the central 30° was far more useful than the routine outlining of the perimeter of the visual field that was commonly being done. He is said to have scorned the available perimetric instruments and mounted a tangent screen on the back of …

Bjerrum's area is the central 25° of the visual field from the fixation point, popularized scientifically by the Danish ophthalmologist Jannik Petersen Bjerrum.

Tangent screen technique, also known as Bjerrum’s screen, is a quantitative method initially popularized by Jannik Bjerrum and further developed by Harry Traquair . The screen is a flat, usually black surface, used for detailed mapping of central 30° of VF ( Figure 4 ).

Quantification of visual fields was developed during the nineteenth century. Jannik Bjerrum began mapping visual fields by asking patients to identify whether a white object on the end of a black stick, in front of a black screen, was seen.

An instructional video on how to carry out a visual field test utilising the Bjerrum Tangent Screen. *Do not own any music included in the video, they belong...

Jan 1, 2013 · We go to the Bjerrum screen when we want to know the exact distance to the center of isolated scotomas or large pericentral scotomas in terminal fields. The best method for conducting this perimetry is that of Armaly and Drance, as we will see later.

Other Test Names: Bjerrum Screen or Tangent Screen. Description of the test. The tangent screen test includes a black felt screen with a pattern of radians and circles sewn in black with a white button in the center, a black wand, a supply of black pins, a selection of targets, an occluder, and a score sheet. A chin rest is also recommended

Historical Significance: This apparatus, known as a tangent screen or a Bjerrum screen, is for locating and measuring blind areas in the central 30 degrees of the visual field.

Bjerrum’s chart is used to measure the central visual field in a patient. The ophthalmic paramedic can learn the Layout of the chart, Advantages and disadvantages of the chart, accessories related to the chart, and maintenance of the chart. This lesson has all these information for the paramedic to learn about the chart and its maintenance.

Bjerrum screen - a flat, usually black surface used to measure the central 30 degrees of the field of vision. Synonym (s): tangent screen. A large plane surface for detecting and plotting the central visual field (about 50º in diameter) by moving the position of a …