OCULUS Pentacam Interpretation Guide

117
16 INTACS
®
implantation
16 INTACS
®
implantation
16.1 Case 1: INTACS
®
implantation
by Prof. Michael W. Belin
A 27-year-old female was referred by her optometrist because of poor vision OD secondary to
keratoconus. Her BSCVA was 20/200 OD and with RGP over-refraction 20/30. The patient complained
of poor contact lens tolerance with less than 3 hours of daily wearing time. The patient was being
considered for intrastromal corneal ring segment implantation (ICRS, commonly referred to as
INTACS® in the US)
Anterior corneal curvature analysis showed significant inferior cone displacement and a maximum
steepness of > 50 D, with the steepest part of the cone well below the pupillary margin (Figure 144).
A presumptive diagnosis of pellucid marginal degeneration (PMD) was made, and the initial surgical
plan was to implant dissimilar INTACS® for PMD.
Surgical planning also included identifying the steep axis for the incision and looking at the
pachymetry over the incision location to determine the incision depth (Figure 145).
Surgical planning included:
 implantation of 0.35 INTACS®
 incision at axis 155°
 incision depth 440 μm
Figure 144: Topography in a case of suspected PMD

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