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A pachymeter is a medical device used to measure the thickness of the eye's cornea. It is used prior to LASIK surgery, and is useful in screening for patients suspected of developing glaucoma. Modern design incorporates ultrasound technology for measurement of the thickness. Earlier models were based on optical principles.
Until recently, pachymetric measurement of central corneal thickness (CCT) has been the exclusive territory of corneal specialists. After all, is an important tool to evaluate the health of the cornea, measuring its thickness to assess a capacity to pump out excess fluid and maintain clarity. Corneal specialists and general ophthalmologists continue to rely on accurate corneal pachymetry readings to manage patients with corneal ectasias (e.g., keratoglobus, pellucid degeneration, keratoconus), Fuchs’ endothelial dystrophy, bullous keratopathy, corneal rejection post – penetrating keratoplasty, and other causes of corneal edema. However, an increasing number of ophthalmologists are now obtaining CCT measurements on patients with (or suspected to have) glaucoma.
A variety of equipment are available for ophthalmologists
to choose from. The most commonly used equipment uses ultrasound technology
and is the clinical standard. Most of the clinical work studying the association
between CCT and glaucoma has relied on ultrasound pachymetry. Ultrasound
require contact with the cornea; the ophthalmologist delivers a drop of
anesthetic to the eye and applies a sterile pachymeter tip gently onto
the cornea. Ultrasounds continue to be popular, affordable
and accurate, but a newer line of pachymeter that use optical low –
coherence reflectometry technology may enhance accuracy and allow non
– contact pachymetry. Studies comparing optical versus ultrasound
pachymetry indicate that optical pachymetry is at least as accurate as
ultrasound pachymetry when measuring CCT. Some optical instrument even
allow real – time monitoring of measurements. Additional features
that ophthalmologists may consider important when selecting the appropriate
equipment, include portability, ability to communicate with office and
surgical equipment (e.g. excimer laser), and built – in algorithms
to estimate the “true IOP” from a CCT correction.
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