What testing method is rapidly used to determine the presence or absence of a field defect?

Visual Field Screening is a rapid testing method utilized to assess a patient's peripheral vision and identify any defects in the visual field. This test is pivotal in detecting conditions such as glaucoma, optic nerve damage, and neurological disorders that can affect peripheral vision.

During the screening, the patient is asked to focus on a central point while lights or objects appear in their peripheral vision. The ability or inability to see these stimuli can efficiently indicate the presence of field defects. This method tends to be straightforward and does not require extensive equipment, allowing for quick assessments in a clinical setting.

In contrast, the other testing methods serve different purposes. The Color Vision Test assesses the ability to differentiate colors and is not designed to evaluate peripheral vision or field defects. Pachymetry measures corneal thickness and is relevant to conditions like glaucoma but does not assess the visual field. The Contrast Sensitivity Test evaluates how well a person can discern between lighter and darker patterns, not specifically identifying visual field issues. Thus, Visual Field Screening is the most suitable choice for rapidly determining the presence or absence of a field defect.