Eine Kombination einer horizontalen/vertikalen Prismenleiste

TL;DRAbstract

Gulden's vertical prism bars, calibrated in the Prentice position, whether used in combination with the horizontal prism bar or by themselves, should always be held with the flat surface toward the examiner. Luneau's horizontal and vertical prism bars should be held one in front of each eye when used simultaneously. As a consequence, neither eye is looking directly at the fixation object, and strictly defining primary and secondary deviations is not possible.

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