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Zero-drift perimetry is a visual field testing approach that aims to reduce fixation drift during the test. Some systems use eye tracking or frequent alignment checks so targets appear where they are intended. This can make results more consistent when fixation is unstable. It is still a visual field test, so repeat testing and good focus still matter.
read more about zero drift perimetry ...If your gaze drifts, a light stimulus can land on a slightly different retinal spot than planned. That can make sensitivity look worse or create a false ?dip? on the printout. Drift control helps the test reflect your true field more closely. Clinics still review reliability markers, like fixation losses and false positives.
You rest your chin on a support and look at a central target. Small lights appear, and you press a button when you see them. With drift control, the system may monitor your eye position and pause or adjust if you move too much. Staying relaxed, blinking normally, and keeping your gaze steady improves accuracy.
People with unstable fixation, central vision changes, or nystagmus can benefit. It can also help when repeatability has been poor across prior tests. Some patients simply have trouble holding a steady gaze when tired. Your clinician decides which test setup fits your situation.
Even with drift control, attention, fatigue, and dry eyes can affect results. One abnormal test does not always mean disease, so repeat testing is common. Results are often compared with OCT scans and a full eye exam. If your field changes quickly, your clinician may schedule earlier follow-up.
It is still automated perimetry, but it puts extra focus on reducing fixation drift. The exact features depend on the device and test program.
No. Perimetry measures function, while OCT shows structure. Doctors often use both because they answer different questions.
Occasional blinking is normal, but frequent movement can lower reliability. If the test is unreliable, the clinic may repeat it or schedule another visit.
It depends on risk level and what your results show. Some people repeat yearly, while others need more frequent tests during monitoring or treatment changes.
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