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000000Ć1150Ć839 IOLMaster 11.02.2004
To delete the data of the lens type selected in the Lenses field, click
the
ERASE
button.
By clicking the
SET
button, existent data of a lens will be overwritten
by any previously edited data.
To enter the data of the next lens, overwrite the name of the lens.
Exit the User Manager by a click on
OK
.
IOL calculation after refractive surgery of the cornea (optional)
Before calculating a proposal for an intraocular lens, the corneal
refraction must be determined.
Initiate the calculation by:
Button (IOL calculation) or
<
I
> key.
Then:
Select the tab "Prior refractive surgery".
Note:
This step of operation is necessary only with corneas pretreated
by refractive surgery. With untreated corneas, IOL calculation is
started instantly on selection of the biometric formula (see IOL
calculation).
The corneal refraction is the quantitatively significant factor used in IOL
calculation. Presently, it is impossible to exactly measure the corneal
refraction that was subjected to corneal refractive surgery (e.g. by RK,
PRK, LTK, Lasik or Lasek). That is why the corneal refraction must be
determined in a different way. For this, two methods are available:
q
Refractive History Method and
q
Contact Lens Method.
For the
Refractive History Method
, the following values must be
known:
q
Preoperative corneal refraction (i.e. before the corneal refractive
surgery,
q
Preoperative refraction,
q
Stable postoperative refraction and
q
Corneal vertex distance.
Taste
Icon
I
Operation
