Evaluation of Contrast Sensitivity, Chromatic Vision, and Reading Ability in Patients with Primary Open Angle Glaucoma
Table 1
Hodapp-Parrish-Anderson classification system.
Early defect
Moderate defect
Severe defect
Mean deviation between 0 and −6 dB, AND at least one of the following listed criteria:
Mean deviation between −6 and −12 dB, AND at least one of the following listed criteria:
Mean deviation <−12 dB, AND at least one of the following listed criteria:
(i) A cluster of ≥3 points on the pattern deviation plot in an expected location of the visual field depressed below the 5% level, at least one of which is depressed below the 1% level, OR (ii) Pattern standard deviation significant at , OR (iii) Glaucoma Hemifield Test = Outside Normal Limits.
(i) ≥25% but <50% of points on the pattern deviation plot depressed below the 5% level, and ≥15% but <25% of points depressed below the 1% level, OR (ii) At least 1 point within the central 5° with sensitivity of <15 dB, but no points in the central 5° can have a sensitivity of 0 dB, OR (iii) Only one hemifield may have a point with sensitivity of <15 dB within 5° of fixation.
(i) ≥50% but <75% of points on pattern deviation plot depressed below the 5% level and ≥25% but <50% of points depressed below the 1% level, OR (ii) At least one point in the central 5° has a sensitivity of 0 dB, OR (iii) Points within the central 5° with sensitivity <15 dB in both hemifields.
