CenterVue
COMPASS Operating Manual
Pag. 28 di 53
Fundus Perimetry vs. Standard Perimetry display conventions
In Standard Automated Perimetry, results are always displayed using the patient’s
perspective, i.e. they represent
visual field maps
, with superior field at the top and
inferior field at the bottom: this convention is used in the Exam Review screen when the
Fundus Mode selector is set to OFF (“Visual Field” convention).
In Fundus Perimetry, results are displayed using the doctor’s perspective, i.e. they
represent
retinal sensitivity maps
and show properly oriented retinal images: this
convention is used whe
n the Fundus Mode selector is set to ON (“Fundus” convention).
Values from the superior field correspond to the inferior retina and viceversa.
Therefore, the two conventions differ in that they flip the results vertically.
COLOR CONFOCAL IMAGING
SLO systems are superior to conventional fundus cameras in many ways, as they exploit
a confocal imaging principle, which limits the effect of backscattered light from deeper
layers and provides enhanced image quality in terms of contrast and resolution. Another
advantage of SLO systems is that they operate with smaller pupils than non-confocal
imaging systems. At the same time, though, SLO systems do not provide color images,
as they typically employ monochromatic laser sources, resulting in black and white or
pseudo-color images.
COMPASS
uses white light
instead of monochromatic lasers, hence providing
true
color
images and offering high image fidelity, no need for dilation down to 3 mm. pupil,
excellent resolution and contrast, high quality even in presence of media opacities and
optimized exposure of the ONH.
