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. Author manuscript; available in PMC: 2007 Aug 2.
Published in final edited form as: Ophthalmology. 2003 Aug;110(8):1499–1505. doi: 10.1016/S0161-6420(03)00496-2

Table 2.

Mean Value, Standard Deviation, and Range of Cup-to-Disc Ratio Determined by Discam, Heidelberg Retina Tomograph, and Stereoscopic Disc Photography

Mean (±Standard Deviation) Range
Discam (n = 386)
 ACDR 0.29 (0.09) 0.10–0.67
 VCDR 0.53 (0.09) 0.33–0.84
 HCDR 0.54 (0.10) 0.32–0.82
HRT (n = 297)
 ACDR 0.41 (0.15) 0.04–0.86
Stereo photos (n = 233)
 VCDR 0.64 (0.17) 0.10–0.98
 HCDR 0.63 (0.18) 0.10–0.98

ACDR = cup-to-disc area ratio; HCDR = horizontal cup-to-disc ratio; HRT = Heidelberg Retina Tomograph; VCDR = vertical cup-to-disc ratio.