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Sensitivity, Specificity, and Predicted Value01:13

Sensitivity, Specificity, and Predicted Value

In healthcare diagnostics, laboratory tests play a crucial role in identifying and diagnosing a wide range of medical conditions. However, interpreting test results is not always straightforward. An abnormal test result does not always confirm the presence of a disease, just as a normal result does not guarantee its absence. To assess the reliability of these diagnostic tools, healthcare practitioners rely on two key statistical indicators: sensitivity and specificity.
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Related Experiment Video

Updated: May 25, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
11:21

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Pentacam sensitivity and specificity in detecting occludable angles.

Gemma C M Rossi1, Luigia Scudeller, Alessio Delfino

  • 1University Eye Clinic of Pavia, IRCCS Policlinico San Matteo Foundation, Pavia, Italy. gemma.rossi.md@gmail.com

European Journal of Ophthalmology
|January 24, 2012
PubMed
Summary

The Pentacam device effectively identifies occludable angles using anterior chamber measurements. This noncontact tool offers reliable and quick screening for narrow angles, aiding in early detection.

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Last Updated: May 25, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
11:21

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Primary angle-closure glaucoma (PACG) is a leading cause of irreversible blindness worldwide.
  • Early detection of occludable angles is crucial for preventing vision loss.
  • Anterior segment imaging devices offer potential for objective angle assessment.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of Pentacam measurements for detecting occludable anterior chamber angles.
  • To establish specific cutoff values for Pentacam parameters to identify narrow angles.

Main Methods:

  • A cross-sectional study involving 64 Caucasian eyes (28 narrow angles/PACG, 36 controls).
  • Gonioscopy (Shaffer classification) served as the gold standard for angle assessment.
  • Pentacam parameters analyzed included anterior chamber angle (ACA), anterior chamber depth (ACD), and anterior chamber volume (ACV).
  • Receiver operating characteristic (ROC) curve analysis was used to determine the discriminant power and optimal cutoffs.

Main Results:

  • All Pentacam measurements (ACA, ACD, ACV) showed statistically significant differences between narrow and normal angles (p<0.0001).
  • ROC analysis demonstrated high diagnostic power for Pentacam parameters: ACA (0.94), ACD (0.91), central ACD (0.89), and ACV (0.89).
  • Established cutoff values (e.g., ACA=22.4°, ACD=1.12 mm) accurately classified eyes with narrow angles.

Conclusions:

  • Pentacam measurements of anterior chamber angle, volume, and depth are highly effective in detecting occludable angles.
  • The Pentacam device is a simple, reliable, noncontact tool suitable for rapid screening of narrow angles.
  • These findings support the use of Pentacam as a valuable screening instrument in ophthalmology.