Table 1.

Criteria for classification of severity of glaucoma stage in the H-P-A grading system

Hodapp, Parrish and Anderson’s Classification
Minimum criteria for diagnosing acquired glaucomatous damage
A Glaucoma Hemifield Test outside normal limits on at least two fields; OR
A cluster of three or more non-edge points in a location typical for glaucoma, all of which are depressed on the pattern deviation plot at a p < 5% level and one of which is depressed at a p < 1% level on two consecutive fields; OR
A corrected pattern standard deviation that occurs in <5% of normal fields on two consecutive fields
Classification of defects
Early defect:
◦ MD < −6 dB
◦ <25% of the points (18) are depressed below the 5% level and <10 points are depressed below the 1% level on the pattern deviation plot
◦ All point in the central 5° must have a sensitivity of at least 15 dB
Moderate defect:
◦ MD < −12 dB
◦ <50% of the points (37) are depressed below the 5% level and <20 points are depressed below the 1% level on the pattern deviation plot,
◦ No points in the central 5° can have a sensitivity of 0 dB
◦ Only one hemifield may have a point with sensitivity of <15 dB within 5° of fixation
Severe defect (any of the following results):
◦ MD > −12 dB
◦ More than 50% of the points (37) are depressed below the 5% level or more than 20 points are depressed below the 1% level on the pattern deviation plot
◦ At least one point in the central 5° has a sensitivity of 0 dB
◦ Points within the central 5° with sensitivity <15 dB in both hemifields

Reproduced with permission from Brusini and Johnson [13]