Kinetic perimetry is a visual field test in which moving stimuli of defined size and brightness are brought from non-seeing to seeing areas to map field boundaries. It is typically performed on a manual or semi-automated perimeter.
Technique
Targets travel along meridians towards the centre while the patient indicates when they first become visible. Isoopters, or lines connecting points of equal sensitivity, are drawn to describe the peripheral field shape.
- Allows tailoring of stimulus size and intensity to patient needs
- Particularly useful for mapping large or irregular defects
- Requires skilled examiners and attentive patients
- Goldmann perimetry is a widely known kinetic method
Clinical Applications
Kinetic fields are valuable in assessing neurological lesions, advanced glaucoma, and conditions where peripheral field extent is critical, such as driving assessments. They also help evaluate functional impact of ptosis or eyelid surgery.
- Can detect constriction or scotomas not fully characterised by static tests
- Comparison over time indicates progression or improvement
- Interpretation considers stimulus parameters and patient reliability
- Often complemented by automated static perimetry for detailed central assessment
