Hit attempt

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The hit test is a simple qualitative method for testing spatial vision in a natural examination environment. A quantitative evaluation of the results as with other ophthalmological tests ( Lang stereo test , Titmus test ) is not possible. It was first introduced into strabological diagnostics by the Swiss ophthalmologist Joseph Lang .

execution

During the test, the task of the subjects therein, with the tip of a pencil holds (or a similar elongated object), the upper tip of a second pencil, to the examiner vertically in the hand and in each case repeated at various distances about presents at eye level him safe hold true. Meanwhile, the examiner's eye position, fusion movements , corneal reflexes and the accuracy of the test object must be assessed. It should be noted that the test person does not slowly approach the target from the side in a horizontal direction, but always hits it precisely from above. The test is carried out both binocularly and monocularly.

rating

A test person who has normal three-dimensional vision will usually hit the pencil tip held in front of him from above with his own pen without any problems. This ability will be lost the moment he turns a blind eye and does a monocular exam. In this case, even a person with normal sight generally misses the presented goal. The same applies to a person whose spatial vision is significantly impaired or completely absent, as is often the case with strabismus .

The hit attempt does not offer any quantitative evaluability, but is an effective means of assessing patients with a small squint angle ( microstrabismus ) to determine whether binocular spatial vision is possible under normal visual conditions without further straining an already unstable binocular vision through apparatus arrangements .

See also

literature

  • Herbert Kaufmann (Ed.): Strabismus. With the collaboration of Wilfried de Decker et al. Enke, Stuttgart 1986, ISBN 3-432-95391-7 .
  • Josef Lang: The attempt to test the stereo vision. In: Clinical monthly sheets for ophthalmology. Vol. 182, No. 6, ISSN  0023-2165 , pp. 576-581, doi : 10.1055 / s-2008-1054858 .