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Table 4 Reasons why there was no photo disc grading in 4349 (34 %) eyes among those who had full examination (n = 12,794 eyes)

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

Reason Right eye Left eye All eyes %
Eye disease
 Cataract 552 469 1021 24 %
 Corneal opacity 304 295 599 14 %
 Other ocular pathology 166 192 358 8 %
    1978 46 %
Participants factors
 Uncooperative 27 31 58 1 %
 Other e.g., home visit 31 27 58 1 %
    116 2 %
Technical reasons
 Faulty camera 471 472 943 22 %
 No electricity 144 144 288 7 %
    1231 28 %
Other
 No reason stated 271 312 583 14 %
 Ungradable photosa 228 213 441 10 %
    1024 24 %
Total 2194 2155 4349 100 %
  1. aPhotos were taken but VCDR could not be assessed because of blurred image due to media opacity or poor positioning of the participant