TABLE 1.

Exclusion Criteria

Criterion	Number	Percent (of 155 Excluded Scans)
Inappropriate recognition of optic disc margin	57	36.8
Insufficient optic disc scan signal strength	67	43.2
Linear OCT scans insufficiently centered over scanned optic disc	2	1.3
Other reasons, for example, artifacts interfering with reliable analysis	12	7.7
Optic disc cup too small to be recognized by the automated ONH analysis algorithm using a cup offset of 150 μm	17	11.0

155 (42.2%) of 367 automated ONH scans were disqualified from inclusion into the normative database.

OCT indicates optical coherence tomography; ONH, optic nerve head.