Which instrument monitors fixation with a viewing telescope?

• A. Autoplot Tangent Screen
• B. Humphrey Field Analyzer
• C. Tangent Screen
• D. Goldmann Bowl Perimeter

Answer: (D)

In perimetry, keeping track of where the patient is looking is crucial because the test maps visual sensitivity to precise retinal locations. The Goldmann bowl perimeter is designed with a viewing telescope that the examiner uses to observe the patient’s eye and ensure they are fixating on the central target while stimuli are presented. This direct, real-time observation lets the tester detect and correct any fixation drift, keeping the results accurate. Other devices listed rely on built-in electronic fixation monitoring or simpler visual observation without a dedicated viewing telescope, so they don’t provide fixation monitoring through a telescope in the same way. Therefore, the instrument that monitors fixation with a viewing telescope is the Goldmann bowl perimeter.