[Can the extent of XXXX be assessed by measuring the asymmetry of the peripapillary height profile between the upper and lower retinal half? A clinical study with the Heidelberg Retina Tomograph].

@entity1 @entity227 @entity66 @entity16 @entity726
BACKGROUND: Peripapillary height measurements are possible using 2 different reference planes of the Heidelberg-Retina-Tomograph. It is not tested yet, whether the extent of @entity16 should be better quantified using reference plane 1 or 2. @entity1 AND METHODS: In 32 eyes of 32 @entity726 @entity1 with a defined up-down asymmetry of @entity227 is tested I.) if there is a significant correlation between peripapillary height and @entity227 comparing reference plane 1 and 2. II.) if there is a conformable up-down asymmetry of the peripapillary height using a new "retinal-asymmetry-difference" (RAD). III.) if conformity between peripapillary height and @entity227 depends on the distance from the disc margin. RESULTS: 1.) For an advanced @entity227 there was a significant correlation between @entity227 and peripapillary height using reference plane 1. II.) In eyes with a big up-down asymmetry of @entity227 there was a bigger conformity between the up-down asymmetry of @entity227 and the up-down asymmetry of peripapillary height (11 of 12 eyes), as for a small up-down asymmetry (12 of 20 eyes). III.) Conformity decreases with the distance from the disc margin. CONCLUSIONS: Peripapillary height should be examined using measurement circles near the disc margin. Because of its independence on the age and on different reference planes additional calculation of an up-down "retinal-asymmetry-difference" (RAD) seems to be useful. Using this up-down "retinal-asymmetry-difference" (RAD) a big up-down asymmetry of @entity227 , equivalent to an advanced @entity66 , is quantified with high sensitivity.
