Frequency doubling technology (FDT) perimetry is based on a flicker illusion created by counterphase flickering of a low spatial frequency sinusoidal grating at a high temporal …

The Frequency Doubling Technology (FDT) perimeter is a portable, relatively inexpensive instrument designed for fast and effective detection of visual field loss 1.

The Humphrey FDT Perimeter uses Welch Allyn Frequency Doubling Technology to provide a clinically verified, fast and affordable means of detecting early visual field loss. The perimeter …

While white-on-white standard automated perimetry (SAP) remains the reference standard for evaluation of visual field (VF) in glaucoma, there is evidence supporting that frequency …

FDT and Humphrey Matrix perimetry have been shown to be effective in the detection, evaluation, and follow-up of glaucomatous visual field loss.

本研究旨在找出倍频技术视野检查（FDT）与标准自动视野检查（SAP）在检测视野（VF）损伤方面的差异的意义，并评估早期SAP-FDT差异的相关因素。 青光眼。 该横断面研究包括早期青 …

2022年6月17日 · This study aimed to find out the significance of the difference between FDT perimetry and SAP in terms of the detected visual field (VF) damage, and evaluate associated …

Frequency-doubling technology seems to be a clinically feasible VF method for evaluating young children older than approximately 8 years of age. The reliability indices, MD, test duration, and …

Importance: While standard automated perimetry (SAP) remains the reference standard for evaluation of visual field (VF) defects in glaucoma, this study demonstrates that frequency …

Aim: To evaluate the effect of cataract surgery on frequency doubling technology (FDT) perimetry in patients with co-existing cataract and glaucoma. Methods: In this consecutive prospective …