About the
Pachymetry:
The pachymetric value to be introduced in this software is that determined in the exact site where you will make the incision. The software will calculate 75% of this value, and this must be the diamond blade calibration.
It is important to
evaluate too the pachymetry of the entire corneal area through where the segment
will be implanted. This may be done through pachymetric maps
obtained
from equipments such as Pentacan or Orbscan, or
even using a ultrasonic pachymeter that should search the whole 5mm diameter zone. The
pachymetry along the implantation zone should be at least the double of the segment
thickness in order
to supply enough
stroma to involve it, avoiding histologycal and metabolic alterations that
may jeopardize the surgery results. As an example, a cornea that is 400 micrometers thick
may
accept segments
UP TO 200 micrometers. If the software calculates, for this exemplified case, a
segment of 250 micra, we should alter the planning, using a segment of 200
micra. Certainly, the corneal flattening obtained will be a little lesser than
expected, nevertheless, it is
better a undercorrection, than a suffering cornea.