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Eugenio J. Maul de la Puente, Andina Reyes, Eugenio A. Maul; Rate Of Unreliable Visual Field Examinations In A Developing Country Setting. Invest. Ophthalmol. Vis. Sci. 2012;53(14):191.
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© ARVO (1962-2015); The Authors (2016-present)
To describe reliability of visual field testing in a developing country setting.
Retrospective review of all threshold visual fields performed at 5 glaucoma clinics affiliated to Pontificia Universidad Catolica de Chile from 2002-2010.Criteria for unreliability was defined as either false positives (FP)>=15%, false negatives (FN) >=25% or fixation losses (FL) >= 25%. For eyes with repeat testing on the same day, only the second test was included in the analysis.
63104 visual field examinations were reviewed, 2637 corresponded to repeat examinations, leaving 60467 tests for analysis.The number of exams per patient was 1,2,3,4 and >=5 in 56%, 21%, 9%, 5% and 9% respectively.The overall proportion of unreliable fields was 33.3%. The proportion of patients failing to meet the reliability criterion for FP, FN and FL was 4.8%, 8.8% and 26.5% respectively. FP were more common in the right than in the left eyes (5.19% vs 4.55%, X2 p-value<0.001). FL were more common in left than right eyes (25.4% vs 27.6%, X2 p-value <0.001).The proportion of unreliable tests on first, second, third and fourth visit was 27.6%, 34.2%, 42.3% and 46.4% respectively. After the fourth test the proportion of unreliable tests remained above 46% up to the 13th visit.
Unreliability when conducting visual fields is a major problem in our setting. Studies to detect unreliable field takers early during follow-up and train them to perform better are needed.
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