OCULUS Pentacam Interpretation Guide

9
3.4 True Net Power
This map (Figure 4) shows the optical power of the cornea based on two different refractive indices,
one for the anterior (corneal tissue: 1.376) and one for the posterior surface (aqueous humour:
1.336), as well as the sagittal curvature of each. These results are aggregated. The True Net Power
map thus takes effects “A” and "B" into account. The underlying equation is:
Figure 4: True Net Power map calculated by two spheric surfaces of
anterior r = 8 mm and posterior r = 6.58 mm
3 Differences between the various topography maps of Pentacam
®
TrueNet Power =
1,376 -1
1,336 -1,376
*
1000 +
*
1000
r
ant_surface
r
post_surface

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