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Effectiveness of measuring the central field with the Berkeley field test
Sanjeeb K Mishra1, Gauri S Shrestha, Hiral Korani
1B.P. Koirala Lions Centre for Ophthalmic Studies Institute of Medicine, Tribhuvan University Maharajgunj, Kathmandu, Nepal.
Summary
The Berkeley central visual field test (BCFT) shows comparable efficacy to the Amsler grid for detecting maculopathy. This study found both tests effective in identifying central visual field defects.
Area of Science:
- Ophthalmology
- Visual Science
Background:
- The Amsler chart has limitations in screening for visual field defects due to low sensitivity and high false-negative rates.
- The Berkeley central visual field test (BCFT) was developed as an alternative screening tool for the central visual field.
Purpose of the Study:
- To compare the diagnostic efficacy of the Berkeley central visual field test (BCFT) against the Amsler grid test.
- To evaluate sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of both tests.
Main Methods:
- A comparative validity study included 30 patients with maculopathy and 35 healthy controls.
- Visual acuity was assessed using Log MAR charts; central visual fields were tested with the Amsler chart-II and the BCFT (50-point scoring system).
Main Results:
- The Amsler grid demonstrated sensitivity of 80%, specificity of 100%, PPV of 100%, and NPV of 87%.
- The BCFT showed sensitivity of 71%, specificity of 99%, PPV of 98%, and NPV of 82% (p=0.37).
- The majority of maculopathy subjects (54%) had age-related macular degeneration.
Conclusions:
- The Berkeley central visual field test (BCFT) is as effective as the Amsler grid test in detecting maculopathy.
- Both tests are valuable tools for assessing central visual field integrity.
