Glaucoma Ch 3b
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SWAP stands for
What type of perimetery is SWAP?
- Short Wavelength Automated Perimetry
- blue yellow
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
- M cells
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
- low spatial
How is progression noted?
- deepening by >7dB
- enlargement by >9dB
- new by >11dB or 2 adjacent areas by >5dB
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