Visual Field Flashcards
that area of space that a person can see at one time
Visual Field
Monocular Visual field is the _____
3-dimensional “Hill of Vision”
Degree of Monocular Visual Field:
150 degrees
remaining portion of visual field that is not seen by the OPEN EYE:
Temporal Crescent
Units of measurement of a visual field
degrees from fixation
degree of temporal crescent:
30degrees
is the superimposition of the two monocular visual fields:
Common binocular visual field
degree of common binocular visual field:
120 degrees
Presentation of stimulus of known size and intensity outside borders of VF or within blindspot
Kinetic Perimetry
area of reduced or absent visual sensitivity inside an isopter
surrounded by area of normal or higher sensitivities
SCOTOA
line connecting all points in the visual field with the same threshold (for a given test spot)
ISOPTER
boundary between area of visibility to the area of non-visibility
ISOPTER
Location of Central VF defect:
5 degrees or less from the point of fixation
Location of Paracentral VF defect:
- greater than 5 degrees to 30 degrees
- coecal, paracoecal, pericoecal, centrocoecal
location of Peripheral VF defect:
greater than 30 degrees
Limits of Normal Visual field:
T = 90degrees
I = 70-75 degrees
N = 60 degrees
S = 65 degrees
line connecting the isopters:
Isometric line
Shapes of VF defect:
Sectorial (hemianopsia) or non-sectorial (regular or irregular)
distance of blind spot from fixation point:
15degrees
49minutes
Height of the Blindspot:
7degrees 40minutes
Width of blindspot:
5degrees 28minutes
Enlargement of Blindspot:
Seidel’s sign
arcuate scotoma associated with Glaucoma:
Bjerrum’s sign
complete arcuate scotoma that ends at the nasal horizontal meridian:
Roenne’s nasal step
scotoma common in migraines:
Scintillating scotoma
Oval shaped scotoma caused by:
toxic amblyopia
Alcohol toxicity
tobacco toxicity
automated perimeter used for older children
Humphrey automated perimeter
allowance of the Blind spot
where there is confusion in the area
Amblyopic Zone - 1 degrees
test that produces a full hemispherical light source to photo-stress the retina when maculopathy is suspected
BAT - Brightness Acuity Test
a sensitive test for detecting patients with macular disturbances such as cystoid macular edema, central serous choroidopathy and senile macular degeneration
Macular Photo-stress Test
a psychophysical perception wherein lateral motion of an object in the field of view is interpreted by the visual cortex as having a depth component
due to relative difference in signal timings between the two eyes
Pulfrich Phenomenon
