Keratron
®
Scout Installation and Operating Manual
OPTIKON 2000
The Cone is back illuminated by the
Lamp Board
which contains a tight array of
LEDS. Behind the Lamp Board there are the fixation led, focused at a large distance,
and the TV Camera.
The photoelectric couple at the edge of the optical head intercepts the eye vertex
when this is at the preset distance from the optical head. An electronic circuit (EPCS)
eliminates the background light and measures the “degree of coverage”, which is
used to accept the acquisition only within a preset range. An array of 5 LEDS at the
right hand side of the TV monitor of the VK, indicates the operator how to move forth
and back towards the eye. If the eye is not at the right distance the image capture will
be inhibited.
The operator thus can only take images, by pressing a footswitch or the OK
pushbutton, only when the patient eye is at a preset distance, which is the same
distance at which the instrument was formerly calibrated on a sphere having a known
curvature radius.
During a test, 2 or 3 photos are usually taken on each eye, then they are processed
by algorithms to reconstruct the shape of the cornea at more than 7000 points
arranged at the crossways between the 28 black-to-white and white-to-black mire
borders and 256 radials or “meridians”.
Graphic routines then interpolates and traces this values in the form of color maps.
The center of the rings is the
corneal vertex
, that is the point of the cornea which is
closer to the observing TV-camera, and that is an important reference point for all
corneal maps. The
entrance pupil
is also detected.
5.2 TECHNICAL SPECIFICATIONS
PARAMETER SPECIFICATION
Manufacturer:...............................
OPTIKON 2000 S.p.a.
via del Casale di Settebagni, 13
00138 Rome - Italy
Model: .......................................... Keratron
®
Scout
Regulatory compliance: ..............
93/42/EEC Medical Devices Directive (MDD)
Technical standards:
EN 60601-1 ; EN 60601-1-1 ;
EN 60601-1-2
Cod. 161204EN
5-2
2008-12-03 Rev.B