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September 2016
EW MEETING REPORTER
that external photography is still the
most important imaging.
Lisa Nijm, MD, Chicago,
highlighted cornea technologies,
including pachymetry, topogra-
phy, anterior segment OCT/UBM,
and a surprise technology that she
described at the end of her presen-
tation.
In terms of topography, there
are several important things to take
into account. There's a lack of stan-
dardization, Dr. Nijm said, so it
may be difficult to compare ma-
chines. Scale matters, she said.
The dioptric range, step size, and
number of colors can influence the
sensitivity of the image. Addition-
ally, the type of map influences the
appearance, Dr. Nijm said. The most
common map is the sagittal or axial
map, which gives an average picture
of the anterior corneal curvature
and is mainly used for screening,
she said. The tangential map shows
the radius of curvature data at each
point but appears noisier and irreg-
ular.
Recognizing areas of artifact is
important, Dr. Nijm said. This can
be produced by misalignment, im-
proper focus, pressure on the globe,
poor tear film, and lubricating eye
drops. If this is suspected, repeat the
exam, she said.
Additionally, she said the pos-
terior elevation maps can be more
sensitive for detecting ectasia.
Her "surprise" technology was
the slit lamp plus phone. This can
be helpful for documenting corneal
conditions, explaining treatment
options to patients, and for getting
second opinions and referrals, she
said.
Dr. Nijm also offered clinical
pearls for capturing corneal findings.
Lighting is key, she said, and it's
important to recall basic slit lamp
techniques. Remember the film is
"free," so you can go ahead and take
a lot of photos because all you need
is one or two that work.
Editors' note: Dr. Nijm has financial in-
terests with Alcon (Fort Worth, Texas).
The other speakers have no financial
interests related to their presentations.
continued on page 124
View videos from WIO 2016: EWrePlay.org
Sarwat Salim, MD, discusses this year's WIO program and key sessions.
