Frequency Doubling Perimetry

DOS Times Vol. 11, No. 6 December, 2005 The goal of perimetry is to establish an accurate estimate of visual field sensitivity. Perimetry is performed to detect early visual field defects, determine specific patterns of visual field loss for differential diagnosis and monitor for evidence of progression of field loss. Conventionally Standard Achromatic Perimetry (SAP) has been used to achieve these purposes but there are certain inherent disadvantages. Newer techniques have developed in need for faster methods of screening, diagnosis and follow-up as compared to conventional perimetry and to examine motion attributes of vision that is involved early in glaucoma and not picked up by conventional perimetry. Frequency doubling technology (FDT) perimetry is such a newly developed technique for the screening and early detection of glaucoma.