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This video explains the unique Composite Eye feature
with the Medmont E300 Corneal Topographer.
This function allows us
to take multiple images cross the Corneal Surface
to build a broader perspective
on the eye shape,
elevation power,
and wave front error.
Start by
clicking on the patient name, then
click on, capture 'Corneal Topography'.
The next step is to take on normal
fixation capture, in other words, how the patient look down the axis of the
instrument centering their fixation on the Central Placido ring.
Once you have a 95% or better capture
click, 'Save',
and then, 'Clear' images.
Now will go on and take our second image
in this case were going to have our patient look
three rings to five rings toward the nose, this is a Right Eye.
You'll notice how the patient
is fixating
in toward the nose, which going to push the rings toward the Temporal side.
We want to image the Placido Reflection
when it's hitting
the Limbus on
every aspect of the Cornea. In this case
we've now push the rings to the
Temporal side.
Once we've saved that image we can go on and take our next image.
We're going to now have the patient looks three to five rings
Temporal and push the Placido Reflection to the Nasal aspect.
When we have 95% or better will click, 'Save',
and then again,
click 'Clear', images,
and start over and take a fresh image.
Now we're on our fourth image, we're gonna have the patient look
Superior three to five rings
and push that Placido Reflection
to the Inferior Cornea
and Sclera.
Once we have a 95% or better image
then will click,
'Save' images
and, 'Clear',
and take our last image.
Having the patient look down is the trickiest of the punch because we need
to pull the Eye Lid back.
In order to move the Cone
close enough to take an image, the
finger has to be out of the way
and that can be slightly tricky to do this long as the eye isn't at
extremely deep set
you should be able to push the
Cone close enough
to take that image with the patient looking down.
In this case where able to push the Placido Reflection to the Superior
Cornea
you see some Eyelash Shadows here
possibly we could do a better job of pulling the Eye Lid back and
pulling those Eyelash Shadows
away from the Placido Reflection.
However,
it can be tricky to get in quick enough
before that Tear Film breaks up
by pulling the Eye Lid back
we're hindering normal blink rate, and
normal tear flow cross the Corneal Surface.
So that last captured will be the trickiest of the bunch,
but it is possible to do on most eyes.
Once you have
your images,
you individually click on each one of them, or click on up to four images at
the same time.
Effectively what needs to happen
is Medmont needs to convert the
Placido Reflection to a colorized image before
a Composite Eye can be created.
Here's our image with
the patient looking down the axis of the instrument, in other words a normal
fixation on the Visual Axis.
The second image is with the patient looking three to five rings toward the
Nose,
pushing the Placido Reflection toward the Temporal side.
The third image
is having the patient looking Temporal,
pushing the Placido towards the nasal aspect,
three to five rings looking Temporal.
The next image is having the patient looking three to five rings Superior,
pushing the Placido Reflection,
Inferior.
Last image,
having the patient look Inferior, pulling the Eye Lid back and pushing the Placido
Reflection Superior.
Once you have the five
images, or more, you can take
images on the Eight Principal Axis,
axes of the eye:
Nasal, Temporal, Inferior, Superior,
Superior Nasal, Inferior Nasal,
Inferior Temporal, Superior Temporal. You can take more than
five images
if you desire to make sure that you're getting one hundred percent
of the Placido hitting one hundred percent of the Cornea.
When you've got your images highlighted
you can go up to, 'Analysis',
and 'Composite Eye'.
Once we hit 'Composite Eye',
the Medmont Studio software will
analyzes each one of those images for error to determine if anyone, or more than
one
should be retaken.
Once I click 'Composite Eye',
you'll notice the software has analyzed
all the images
and determined that the image taken at, '12:57:25'
05:28
0529
in the PM.
has an average fitting error of 5 Microns.
In other words, this image should be retaken
prior too
doing a Composite Eye.
We should eliminate the third image
'12:57:25',
retake that fixation,
and then
calculate the Composite Eye
five or more quality images.
Once your Composite Eye
has been created,
now you can see that the image capture is on virtually
one hundred percent of the Corneal Surface.
there's a small amount of information missing
from the Superior Temporal aspect,
we should therefore,
have the patient take one more fixation
where we're looking
Inferior Nasal to push the Placido,
Superior Temporal, and make sure the rings of capturing this area of the
Corneal Surface.
When comparing the Composite Eye
area of capture to a normal
fixation, a normal capture, with
our Medmont.
Notice how we're getting a
large area of information on the Corneal Surface
the Medmont has one of the largest capture areas of Placido Ring Topographers.
However, their is some Cornea
that's missing
and that's where the Composite Eye feature is
very beneficial to us. We're able to calculate the eye surface across
virtually one hundred percent of the Cornea.
This is very important to us
when we use the Medmont Contact Lens Fitting Module
to build a large diameter GP Lens that may be hitting the Peripheral Cornea.
This may be helpful for the Scleral Lens Fitting Module when we're trying to
determine and predict the shape
of the eye
past the Visible Iris Diameter
so we can't predict
the appropriate Scleral Lens fitting parameters.
And this will also be helpful for
the Freestyle Lens
when we are trying to build a larger diameter lens
and we need to understand the shape and elevation of the eye
across one hundred-percent
of the cornea.