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Table 1 Definition of glaucomatous visual field defects for level 1 evidence of glaucoma

From: A Population-based survey of the prevalence and types of glaucoma in Nigeria: results from the Nigeria National Blindness and Visual Impairment Survey

FDT test defects Visual fields
  Normal Definitely glaucoma Probably glaucoma Possibly glaucoma Unlikely glaucomaa
P <5 % 2 or less non-adjacent 4 3 2 adjacent  
P <2 % 1 3 2 1  
P <1 % 0 2 1 non-edge   
P <0.5 % 0 1 1 non-edge   
Comments   At any location in any hemi-field At one hemi-field At one hemi-field If TDP plot is better than PDP plot
Participants with glaucoma Total     
 Number of participantsb 268 (100 %) 252 (94 %) 6 (2.2 %) 9 (3.4 %) 1 (0.4 %)
 Number of eyes 310 (100 %) 283 (91.3 %) 9 (2.9 %) 13 (4.2 %) 5 (1.6 %)
  1. TDP total deviation probability, PDP pattern deviation probability
  2. aOther evidence of glaucoma noted in those classified as glaucoma
  3. bIn participants with bilateral glaucoma, the eye with the highest level of evidence is used to classify that person