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Zeiss IOLMaster Customer Service: 1-877-486-7473 ext.
4030
IOLMaster — Axial Length Measurement
Pseudophakic Eyes.
Pseudophakic Eyes and False Images
Axial length measurement of pseudophakic eyes; double peaks with certain
IOL; Source: W. Hill, Mesa, Arizona
Measuring Errors with Pseudophakic Eyes
Two peaks may appear when
measuring pseudophakic eyes and
with certain intraocular lenses (e.g.
Acysof). The first higher peak (false) is from
the IOL, while the second peak is
produced by the retina. In this case,
manual correction of the axis length
is necessary.
It is expedient to measure at a
number of different points.
Because the IOL Master is an optical device, reflections off the surface of PMMA,
acrylic intraocular, and occasionally silicone lenses, can sometimes produce
false images. To avoid this, sample several areas around the reticule using the
correct Measurement Technique.
If
there is a visible reflection off the surface of an intraocular lens implant,
excluding the responsible area will usually give correct results. When the
axial length is much shorter than expected, a false image is probably in play.
Then, a comparison with the fellow eye typically renders a significant difference,
usually greater than 3.00 mm.
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IOLMaster Checklist (pdf)