REPEATABILITY AND COMPARABILITY OF AUTOMATED KERATOMETRY - THE NIKON NRK-8000, THE NIDEK KM-800 AND THE BAUSCH-AND-LOMB KERATOMETER

This study assessed the repeatability of the Nikon NRK-8000, the Nidek KM-800 and the Bausch and Lomb keratometer. In addition, the comparab ility of the Nikon NRK-8000 and the Nidek KM-800 are evaluated relativ e to the Bausch and Lomb keratometer, Measurements were taken with all three techniques on two separate occasions with a test-retest separat ion of at least 24 hr, The right eyes of 30 normal subjects were used. Repeatability and comparability statistics and plots were generated u sing matrix representations of dioptric power. The Nidek KM-800 coeffi cient of repeatability values were found to be 0.345, 0.167, End 0.321 in the vertical, torsional, and horizontal meridians while the Nikon NRK-8000 values were 0.346, 0.232, and 0.276 respectively. (C) 1998 Th e College of Optometrists. Published by Elsevier Science Ltd. All righ ts reserved.