---
title: What is frequency doubling perimetry?
description: "Frequency doubling perimetry is a visual field test that presents low spatial frequency gratings flickering at high temporal frequencies, producing an illusion of doubled spatial frequency. It targets specific retinal ganglion cell pathways. ## Technique The patient views flickering striped…"
url: "https://bluefinvision.com/knowledge-base/topics/diagnostics-testing/what-is-frequency-doubling-perimetry/"
updated: "2025-12-11"
category: "Diagnostics & Testing"
---

# What is frequency doubling perimetry?

Frequency doubling perimetry is a visual field test that presents low spatial frequency gratings flickering at high temporal frequencies, producing an illusion of doubled spatial frequency. It targets specific retinal ganglion cell pathways.

## Technique

The patient views flickering striped patterns at various field locations and indicates when they are visible. Thresholds are measured quickly using algorithms designed for screening or full-threshold testing.

- Compact devices are suitable for clinic or community screening
- Testing times are typically shorter than standard automated perimetry
- Stimuli are less affected by refractive blur within certain ranges
- Results are displayed as probability maps and summary indices

## Clinical Applications

Frequency doubling perimetry is commonly used for glaucoma screening and early detection of functional loss. Abnormal results often lead to more comprehensive field testing.

- Sensitive to early damage in subsets of magnocellular ganglion cells
- High specificity when appropriate criteria and reliability checks are used
- Useful in settings where rapid assessment is needed
- Interpretation must consider age norms and test reliability indicators