Cluster Formation for Analyses of Glaucomatous Visual Field Defects in Central 10-2 Visual Field in Normal Tension Glaucoma Eyes.

Purpose: To develop a cluster system to analyze the retinal sensitivity loss of 68 test points in the central 10 degrees of standard automated perimetry (SAP) in eyes with normal tension glaucoma (NTG).

Patients And Methods: Patients with NTG who met the following criteria were included: visual acuity ≥0.7, SAP-derived mean deviation ≥-15 dB, and pattern deviation probability plots with at least one point with a probability of <0.