Topographic relationship between frequency-doubling technology threshold values
نویسندگان
چکیده
منابع مشابه
Mechanisms isolated by frequency-doubling technology perimetry.
PURPOSE The frequency-doubling (FD) phenomenon describes the increase in apparent spatial frequency occurring when low-spatial-frequency sine wave gratings undergo rapid counterphase flicker. It is unclear whether the visual mechanisms isolated when pattern appearance is used as a threshold criterion are the same as when a simple detection criterion (as in FD perimetry) is used. It is also uncl...
متن کاملFrequency-doubling technology and parasol cells.
Swanson et al. have reported an excellent study of the responses of macaque retinal ganglion cells (RGCs) to Goldmann size III stimuli and contrast-modulated grating stimuli. They estimated the contrast gain of the initial rising phase of the contrast response function of the cells. From the physiology shown, the extracellular recorded RGCs are parasol and midget RGCs and are referred to in ter...
متن کاملFrequency-doubling technology perimetry and optical defocus.
PURPOSE The frequency-doubling technology (FDT) perimeter has no provision for introducing corrective lenses, save for the patient's spectacles, and so patients are sometimes tested in the presence of moderate levels of defocus. The effect of defocus on frequency-doubling (FD) sensitivity was determined for both the commercially available instrument and for smaller targets that may be useful in...
متن کاملDevelopment of efficient threshold strategies for frequency doubling technology perimetry using computer simulation.
PURPOSE To develop new test procedures for frequency-doubling technology (FDT) perimetry that improve performance beyond those currently used. METHODS Two novel threshold estimation procedures were evaluated: a rapid, efficient binary search technique (REBS) and a maximum-likelihood estimation (ZEST) procedure. A computerized visual field simulation model was developed to determine the accura...
متن کاملClinical evaluation of frequency doubling technology perimetry using the Humphrey Matrix 24-2 threshold strategy.
AIMS To evaluate performance of frequency doubling technology (FDT) perimetry using the Humphrey Matrix 24-2 thresholding program in a hospital eye service (HES) glaucoma clinic. METHODS A random sample of individuals referred consecutively to the HES for suspected glaucoma were examined with 24-2 threshold FDT in addition to routine clinical tests. The discriminatory power of FDT and standar...
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ژورنال
عنوان ژورنال: Acta Ophthalmologica
سال: 2011
ISSN: 1755-375X
DOI: 10.1111/j.1755-3768.2011.02289.x