Comparison between results obtained with traditional perimetry and those with frequency doubling perimetry in initial phase chronic simple glaucoma

Abstract

A frequency-doubling perimetric study in normal tension glaucoma with hemifield defect. J Glaucoma 7: 261-265.

Can Frequency-doubling Technology and Short-wavelength Automated Perimetries Detect Visual Field Defects Before Standard Automated Perimetry in Patients With Preperimetric Glaucoma?

“…The RB discriminant function provided by the HRT export software is from Reinhardt Burk, not from Renuka Bathija, and therefore we did not use the formula provided by Bathija. FDT and SWAP are thought to detect VF losses at early stages of glaucoma disease. [6][7][8][9][10][11][12] In our preperimetric glaucoma group, both perimetric measurements showed glaucomatous defects in at least 1/3 of the subjects. The higher the probability of glaucomatous structural damage (more negative the FSM or more increased the NFI), the greater the sensitivity of FDT and SWAP to detect VF defects.…”

“…New psychophysic tests, such as short-wavelength automated perimetry (SWAP) and frequency-doubling technology perimetry (FDT), which attempt to isolate specific ganglion cell subpopulations are superior to SAP for the early detection of VF loss associated with glaucoma. [6][7][8][9][10][11][12] On the basis of the studies comparing the results of VF tests developed to evaluate certain retinal ganglion cells population, 3 alternative theories of glaucomainduced ganglion cell damage have been proposed 13 : (1) glaucoma damage is selective for larger diameter retinal ganglion cell axons at earlier stages of the disease. 14 (2) All optic nerve fibers are damaged in glaucoma.…”

“…The design of the present study followed all 25 items of the STARD guidelines. 37 Several studies [6][7][8][9][10][11][12] have assessed the ability of FDT and SWAP to detect glaucomatous VF defects, even at early stages of the disease. To our knowledge, however, none of the studies evaluated the diagnostic value of these perimetries in preperimetric glaucoma patients, defined by the presence of glaucomatous structural damage measured with objective instruments.…”

Visual function in glaucoma

“…[63][64][65][66][67][68][69] Glaucoma patients fail to detect the stimuli in regions that grossly match the part of the visual field found to be defective by conventional perimetry.…”