ORBSCAN II sets a new
standard for precision measurement of the anterior segment of the eye.
Utilizing a scanning slit measurement system, the instrument provides the
clinician with important diagnostic information about the cornea, iris, and
lens. The state of the art ORBSCAN II is one of the most technologically
advanced corneal topography systems available.
II provides anterior segment data in the form of topographic surfaces.
Elevation topography of the anterior cornea enables clinicians to more
accurately visualize the shape of abnormal corneas, which leads to more
accurate diagnoses and more consistent surgical results. The reason for this
is simple but important. When presented with maps of curvature or slope, you
must mentally translate these data into elevation, because we visualize
shape as topography (hills and valleys). This translation can be very
difficult, often counter-intuitive, if the curvature map is of an asymmetric
or irregular surface. Curvature alone does not usually provide sufficient
useable information for the mind to construct an accurate three-dimensional
Traditionally, power maps
(actually surface curvature) have been axis-centered, which are method
dependent and only show one selected piece of the complete angle-dependent
power. The new mean and toric decomposition of the complete curvature tensor,
allow clinicians for the first time to see and quantify local curvature (and
paraxial power) variations as well as the fundamental spherocylindrical
components. Full corneal pachymetry allows surgeons to use regional blade
settings, to measure the laser ablation depth from a fixed surface (the
posterior cornea), and to assess the effect of the posterior surface on
corneal power. Accurate knowledge of both surfaces will provide researchers
with real data for corneal mechanics simulations. The point of minimum corneal
thickness is a local center of axisymmetry, which for normal corneas aligns
closely to the overall optical axis of the eye.
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