Glaucoma Ch 3b
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SWAP stands for
What type of perimetery is SWAP?
Short Wavelength Automated Perimetry
FDT stands for?
What type of perimetry is FDT?
What is this type of perimetry thought to test preferentially?
Frequency Doubling Technology
low spatial frequency sinusoidal grating undergoing rapid phrase reversal flicker
Define the following?
a) differential light sensitivity at which stimulus is seen 50% of the time
b) brighter than threshold- use for screening
target moved from area not seen to area where it is seen
c) stationary stimulus presented at various locations with changes in brightness..(size, duration)
d) line on visual field representation
e) decrease in retinal sensitivity
f) areas of decreased retinal sensitivity
Size of stimulus
How does full threshold strategy determine retinal sensitivity at each point
inital 4-dB steps until threshold is crossed than recrosses using 2dB to recheck and refine
What is the difference b/w SITA and older tests?
SITA standard yields higher values for differential light sensitivity
a) Average time for SITA standard v/s Full threshold
b) Average time for SITA fast v/s SITA standard
c) Which test is not for glaucoma patients
a) 50% reduction
b) 30% reduction
c) SITA FAST, SUPRATHRESHOLD
Which reliability index can possibly mean glaucomatous damage instead of poor reliability?
STATPAC 2 is only for glaucoma and compares ______?
points above and below horizontal midline
a) SWAP----Sensitivity to blue is mediated by
b) Frequency doubling technology (FDT) measures
c) What type of temporal frequency and spatial frequency does FDT test?
a) small subset ganglion cells with large receptive files with little overlap & large axon diameters
b) contrast detection for frequency double test targets-
c) high temporal frequency
How is progression noted?
deepening by >7dB
enlargement by >9dB
new by >11dB or 2 adjacent areas by >5dB
Glaucoma Ch 3b