Actas de congresos
Critical evaluation of the ultrasonic pachymetry for “in vitro” corneas.
Fecha
2011-02Registro en:
SPIE BiOS, 2011, San Francisco, California, United States
doi: 10.1117/12.872885
Autor
Lincoln, Victor Antonio Cacciacarro
Schiabel, Liliane Ventura
Sousa, Sidney Julio de Faria e
Institución
Resumen
The measurement of central corneal thickness (CCT) is vastly useful for diagnostic and therapeutic evaluation. The
ultrasound pachymetry is currently the most common CCT technique. This study was undertaken to determine the
precision and correlation of measurements obtained by mechanical and ultrasound pachymetry. The ultrasound
pachymetry was determined using an A-scan ultrasonic pachymeter. The probe tip was held perpendicular on the central
cornea by a support that goes down smooth to avoid excessive pressure and instability. The mechanical pachymetry was
determined using a micrometer with a tip of 2mm of diameter. The tip of the micrometer was held perpendicular on the
central cornea by a support that keeps stabilized. A 10x optics increase and a digital video camera shows real time image
of approach and full contact of the tip with the cornea. Eight human corneas were obtained from cadaveric eyes.
Measurements in both systens were taken for three different users, each one performed five readings. The results for both
systems has an average SD of 33 microns refers to the systematic error between users (for positioning, center, pinching).
But the difference between systems was 120 microns, possibly refers to the imprecision of ultrasound pachymetry in
measuring in vitro corneas
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