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Eye
Technology
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Depending upon the conditions of each patient's eyes, different
instruments in our Pre-Test Room are selected by our doctors to
learn more about those eyes before the doctor meets with
the patient in an exam room.
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The Pre-Test Room In
our Wyomissing office conveniently houses the following
instruments in one location:
Corneal
Topographer
– maps the hills and valleys of the cornea (front surface of the
eye); Corneal topography is used in the diagnosis and management
of various corneal curvature abnormalities and diseases such as
keratoconus, corneal transplants, irregular astigmatism and
corneal scars, as well as fitting contact lenses and planning
refractive surgery (i.e. LASIK).
Differences
between a patient's corneas are evident in this example. When
both eyes are shown together, the right eye is on the left and
left eye is on the right, as if the doctor were staring into the
patient's eyes.
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Specular
Microscope
– takes a picture of the endothelium (the bottom layer of the
cornea); The specular microscope helps the doctors to monitor
for progression of sight-threatening corneal degenerations as
well as damage from contact lens wear.
Here, for a
different patient, differences can be seen between one cornea's
endothelium and the other's.
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Fundus Camera
– takes pictures of the front part of the eye as well as the
back of the eye (retina, macula, optic nerve, blood vessels) to
document eye diseases and disorders observed during examination.
This image is
of a left eye, which is on the doctor's right when looking at a
patient. The small, whitish disc to the left of center is the
head of the optic nerve that connects at the back of the eye.
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Automatic Lensometer
– reads the prescription in the glasses the patient is currently
wearing.
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Automatic Refractor
– gives an estimation of the patient’s current glasses
prescription which is used as a starting point by the doctors.
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Frequency Doubling Perimetry
– a screening visual field that tests for underlying neurologic
eye problems, such as pituitary or other sight/life threatening
tumors, stroke, optic nerve inflammation, early glaucoma or
other neurological conditions; The doctors will perform a
medical visual field test for further analysis if any
abnormalities are observed on the screening.
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Optical Coherence
Tomography
– compiles a 2D image to give a 3D representation of the retina
and/or optic nerve; this helps the doctors to monitor conditions
like macular degeneration, epiretinal membrane (wrinkling of the
macula), glaucoma, etc.
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Visual Field Test
– tests a patient’s peripheral and central vision; The doctors
use the visual field to monitor for the presence or progression
of glaucoma, ocular toxicity from medications (i.e. Plaquenil),
stroke, optic nerve inflammation or other neurologic eye
conditions.
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A typical Examination Room has
the following instruments:
A Phoropter
on the left and a Slit Lamp on the
pedestal on the right. The small, black instrument below the
computer monitor in the center is
a
Keratometer,
a manual instrument to measure the curvature of the eye.
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Phoropter
- contains many lenses that can be combined in multiple ways to
help the doctors determine the most accurate glasses
prescription for the patient.
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Slit Lamp:
a microscope that magnifies the eye so the doctors can evaluate
the health of the patient’s eyes; The doctors use lenses in
combination with the microscope to increase the magnification
and see inside the eye, viewing the retina (wallpaper inside the
eye containing all of the cells that we see with), the macula
(center of best vision on the retina), blood vessels and optic
nerve.
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Our busy
Optical Service Department, now has
Visioffice!
Visioffice:
measures the distance between the two eyes, height of bifocal,
how the patient moves his/her eyes and head to make the glasses
prescription custom to each patient’s unique eyes.
Visioffice
records measurement necessary for delivering to a patient the
most precise, individualized vision.
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