LKC TECHNOLOGIES RETeval - Page 43

RETeval Complete Option
RET eval Device User Manual 42
light adaptation. ISCEV recommends 20 minutes of dark adaptation and 10 minutes of light
adaptation.
ISCEV 6 step, light adapted first, cd
Description
Eye
Flash luminance energy
(0.33, 0.33 white)
Background luminance
(0.33, 0.33 white)
#
flashes
Light adapted 3.0 ERG
Right
3 cd·s/m² @ 2 Hz
30 cd/m²
30
Light adapted 3.0 flicker
ERG
Right
3 cd·s/m² @ 28.3 Hz
30 cd/m²
141 –
424
Light adapted 3.0 ERG
Left
3 cd·s/m² @ 2 Hz
30 cd/m²
30
Light adapted 3.0 flicker
ERG
Left
3 cd·s/m² @ 28.3 Hz
30 cd/m²
141 –
424
Dark adaptation timer
Both
Off
Off
Dark adapted 0.01 ERG
Right
0.01 cd·s/m² @ 0.5 Hz
Off
9
Dark adapted 3.0 ERG
Right
3 cd·s/m² @ 0.1 Hz
Off
5
Dark adapted 10.0 ERG
Right
10 cd·s/m² @ 0.05 Hz
Off
5
Dark adapted 0.01 ERG
Left
0.01 cd·s/m² @ 0.5 Hz
Off
9
Dark adapted 3.0 ERG
Left
3 cd·s/m² @ 0.1 Hz
Off
5
Dark adapted 10.0 ERG
Left
10 cd·s/m² @ 0.05 Hz
Off
5
This protocol (ISCEV 6 step, dark adapted first, cd) switches the testing order to do the dark
adapted tests first. The RET eval device performs a calibration at the beginning of every protocol.
So that the calibration light flashes do not affect the dark adaptation state of the subject, place
the device on the patient’s forehead when requested by the device. Skin color has a small, but
measurable, effect on the light output (due to the skin’s reflectance); thus, the test subject’s
forehead should be used. In this protocol, there is a light adaptation timer for each eye to be
adapted to 30 cd/m
2
. ISCEV recommends 20 minutes of dark adaptation and 10 minutes of light
adaptation.