Certified Ophthalmic Medical Technologist (COMT) Practice Exam

Which type of perimetry is best suited for detecting changes in the central visual field sensitivity?

1. Static perimetry

2. Kinetic perimetry

3. Confrontational test

4. Visual acuity assessment

The correct answer is: Static perimetry

Static perimetry is particularly effective for detecting changes in the central visual field sensitivity because it measures the sensitivity of vision at specific points within the visual field in a controlled manner. During a static perimetry test, a light stimulus is presented at various locations, and the patient indicates when they can see the light. This method allows for precise mapping of visual sensitivity and can highlight subtle changes in the central visual field, making it invaluable in diagnosing conditions like glaucoma, where early detection of central visual field loss is crucial. In contrast, kinetic perimetry measures the visual field by moving a light stimulus into the periphery until the patient detects it, which is more useful for assessing the overall visual field rather than focusing on the fine details of central sensitivity. The confrontational test is a more basic method to evaluate gross visual field deficits and does not provide the granularity needed for early detection of changes in central visual field sensitivity. Visual acuity assessment measures clarity of vision rather than the sensitivity across the visual field and thus does not specifically address central field changes.