Computerised visual field analysis, or automated perimetry, measures sensitivity to light across the visual field using a computer-controlled perimeter. It is essential in diagnosing and monitoring glaucoma and many neurological conditions.
Procedure
The patient fixates on a central target inside a dome while lights of varying intensity appear at different locations. They press a button whenever a light is seen, and the device maps threshold sensitivities and reliability indices.
- Tests one eye at a time with appropriate refractive correction
- Standard algorithms, such as threshold or screening strategies, are available
- Outputs include grey-scale plots, numerical sensitivity maps, and global indices
- Fixation losses, false positives, and false negatives assess test reliability
Clinical Uses
Automated fields detect characteristic patterns of loss in glaucoma, optic neuropathies, and chiasmal or post-chiasmal lesions. Serial tests allow assessment of progression.
- Results guide treatment intensity and follow-up intervals
- Integrated analysis tools compare current to baseline fields
- Patient training and proper positioning improve test quality
- Interpretation combines structural imaging, pressure readings, and clinical findings
