Keratron™ Nova
Manual for installation and use
OPTIKON 2000
Cod. 161601EN
7-19
2016-12-28 Rev.B
We are reminded to use this feature when necessary; acquisition conducted in
this manner may result in precision higher than the acquisition stated in this
manual for normal acquisition.
The diagnosis must be carried out by crossing
other data and patient history.
In Keratron™ Nova topography, to acquire an image it is not essential to centre the
rings perfectly with the cross, since a special algorithm compensates adequately the
lateral displacement within the first 2-3 mires. However, one must move forward
always slowly around the correct distance from the corneal apex, avoiding to bump
into the patient with the mires cone, then asking him to
blink
and
then open well
wide both eyes
. Now we need to get to the
OK
location and press the button within
a few seconds, to avoid both the breaking of the tear film and the
artefacts due to the
presence of eyelashes
(§13). If the patient blinks, discard the picture with [Discard]
and repeat the operation.
IMPORTANT:
Ask the patient during the examination to look at the green fixing LED.
NOTE:
Be careful not to bump the patient with the cone when moving the Keratron™ Nova
forward. For this purpose, instead of sitting behind the display, it is a good idea to
observe constantly the position of the cone in relation to the position of the eye from
above.
Adjust the cart XYZ so as to avoid the cone hitting the patient’s nose or eyebrow.
Adjust the height of the table and of the chin rest to obtain the most stable position
possible.
7.3.1 TBUT
It is possible to select the test for the break-up time (TBUT) which evaluates how
quickly the patient is subjected to the rupture of the tear film. By activating this
function, after having the patient wink you have to acquire a first image of the eye in
OK
position. Then 16 images, are shot in sequence at a distance of 1 second and
transmitted to the PC. During this sequence, the patient must keep the eye well
open, and the operator must maintain the image as much as possible and centred
next to the OK position.
For the analysis of results and the archiving of the TBUT tests, see the Help of the
Scout software.
