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3.2.7 CCT correction
1. Press and hold the menu button to open the software menu. Follow
the menu map in section 3.1.3 to ensure the CCT correction function
is enabled.
2. Follow the instructions in section 3.2.4 to retrieve an IOP
measurement. Once a suitable average reading is obtained, follow
the CCT workflow shown below. The CCT group selected for the
patient should correspond to the one measured separately by a
pachymeter. Use the menu button to confirm your selection.
3. The CCT screen will show the CCT group and the correction
applied under the relevant eye.
Obtain
readings for
either one or
both eyes
Show CCT
screen:
OD/OS button
toggles:
Menu button
Short press
CCT dialog
(selection list)
Return button
Menu button
Short press
CCT dialog
(selection list)
Return button
OD/OS
Button
OS
OD
1. OD
2. OD+CCT
3. OS
4. OS+CCT
TonoCare CCT Workflow
The accuracy of IOP measurements is known to be
affected by variations and changes in corneal
rigidity due to differences in corneal thickness, intrinsic
structural factors or corneal refractive surgery. It is
recommended that these factors are considered during IOP
measurement. The biomechanical properties of an individual
cornea may vary, resulting in changes of the relative stiffness
or rigidity of the cornea and altering the measurement.
Other factors to consider include corneal edema and other
corneal abnormalities potentially affecting rigidity (e.g.,
keratoconus, corneal transplant, crosslinking) in addition to
intrinsic structural factors and corneal refractive surgery.