BIOLINE
Manual for installation and use
OPTIKON 2000
8.5 IOL CALCULATION SESSION
This session allows the power of the intraocular lens, spectacles or contact lens to be
calculated after having specified the two keratometric constants K1 and K2. The axial
length is sent directly from the A-scan session. The type of lens can be selected from
a group of 15 lenses distinguished from one another by their respective serial
number.
The following three values are associated with each lens:
1.
ACD : length of the anterior chamber (used in the theoretical formulae).
2.
A: Constant A (used in the SRK formula).
3.
SF: Surgeon Factor (constant used in the HOLLADAY formula ). If SF
=
-9.99
the value of SF is taken from the constant A of the lens. Specify -9.99 if SF is
not known.
The aforementioned constants can be changed and remain stored with the relating
lens. The result of the calculation is a table with 5 values, power and refraction,
graded in half diopters. The powers of the contact lens (CONTACT) and the
spectacles (APHAKIC) are also indicated.
An alternative method of inserting the keratometric constants K1, K2 is available in
the form of corneal radius of curvature (in mm), rather than dioptres. In order to
select the format of these values, enter on the preset page by pressing the SET key.
Use the arrow at the bottom in order to move to the last row “ K READINGS UNITS:”;
select using the horizontal “DIOPTERS” arrows for dioptres or “RADIUS MM” for
corneal radius of curvature.
Press the Enter key to finish.
On the IOL calculation page, the two rows at the bottom will indicate K1 ,K2 for the
dioptre format or R1, R2 for the radius of curvature format, depending on the
previous selection.
Code 141002EN
8-5
26.10.05 Rev.0