Schober test
The Schober test is an examination method with a medium degree of dissociation , which is used in strabology for the qualitative examination of simultaneous viewing and fusion and thus provides information about latent or manifest deviations from the squint. It was developed by the physicist and ophthalmologist Herbert Schober .
execution
During the examination, the test person is presented with red-green glasses or a simple red-green filter in order to separate the visual impressions of the right and left eyes by color. He then looks at a green cross within two red circles at a distance of five meters. Because of the color filters, he can only see the cross or the circles with one eye.
evaluation
A test person with normal eyesight or harmoniously abnormal retinal correspondence will now be able to see a green cross in the middle of two red circles. Double vision ( diplopia ) occurs in people with an unstable fusion, but who still have simultaneous vision , and they recognize the green cross outside the center of the two red circles. Its position is shifted more or less pronounced depending on the existing deviation in the horizontal and / or vertical plane. By holding prismatic glasses , the cross can be optically shifted back into the center and the objective or, if applicable, subjective squint angle can be determined. If the subject's binocular vision is disturbed to such an extent that there is no simultaneous vision and the visual impression of one eye is suppressed, they only perceive either the green cross or the red circles.
See also
literature
- Herbert Kaufmann (Ed.): Strabismus. With the collaboration of Wilfried de Decker et al. Enke, Stuttgart 1986, ISBN 3-432-95391-7 .
