OCULUS Pentacam Interpretation Guide

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The IOP, measured with the Goldmann tonometer (2 p.m.), was 22 and 24 mmHg in OD and OS,
respectively. Interestingly, the averages of two ocular response analyser measurements of Goldmann-
correlated IOP, corneal compensated IOP and hysteresis were 20.4, 17.8 and 13.2 mmHg in OD and
25.1, 20.5 and 14.1 mmHg in OS.
Computerized visual field tests showed both optic nerves to be within normal limits (Figure 90).
Pascal Dynamic Contour Tonometer IOP measurements were 18.4 and 19.6 mmHg in OD and OS,
respectively.
This is a case of normal thick corneas of correspondingly high stiffness, leading to ocular
hypertension. There is no indication for topical medications to decrease the IOP.
Figure 90: HRT single report with images of the optic nerve in OD and OS
It is shown (Figure 89) that moving peripherally from the 4 mm zone the thickness progression graph
does not run parallel to the normative data. The progression index is 0.9 for OD and 1.1 for OS. When
screening for ectasia we would consider 1.2 as the borderline. Here the profile curves should be
analyzed in combination with the progression indices and Scheimpflug images for a more accurate
clinical decision.
11 Corneal Thickness

OCULUS Pentacam Specifications

General

Measurement Time	Less than 2 seconds
Corneal Coverage	Up to 12 mm
Software	Pentacam Software
Data Transfer	USB
Corneal Topography	Yes
Display	External monitor required
Measurement Principle	Scheimpflug imaging
Camera	Rotating Scheimpflug camera
Light Source	Blue LED
Pachymetry	Yes
Anterior Chamber Analysis	Yes
Imaging Principle	Scheimpflug imaging
Fixation	Internal
Power Supply	100-240 V, 50/60 Hz
Resolution	High resolution
Lens Density Measurement	Yes
Dimensions	Varies depending on model and configuration
Weight	Varies by model, check manufacturer specifications
Number of Images	25 or 50