OCULUS Pentacam Interpretation Guide

121
16.3 Case 3: INTACS
®
& crosslinking
by Prof. Renato Ambrósio Jr, Fernando Faria-Correia, MD,
Allan Luz, MD
A 24-year-old male patient presented with progressive keratoconus in OS and anisometropia.
Uncorrected visual acuity (UCVA) was 20/20 in OD and 20/200 in OS. Wavefront assisted manifest
refraction was sph -0.75 cyl -5.25 A 175°, giving 20/30 in OS. Femtosecond laser assisted (FS-200,
Alcon, Fort Worth) INTACS® implantation was performed using Keraring (Mediphacos, Belo Horizonte,
Brazil) SI6 150[o] with 250 mm thickness. INTACS® implantation was combined with transepithelial
(EpiON) crosslinking using riboflavin 0.22% solution (VibeX Xtra; Avedro Inc., Waltham, MS, USA).
The patient was subjected to 8 min. of pulsed UV-A light (1 sec on/1 sec off) at 30 mW/cm
2
(energy
dose of 7.2 J/cm
2
) with the Avedro KXL. After 6 weeks his UCVA was 20/30 and his BCVA was 20/25+
(sph 0.00 cyl -1.00 A 170°). Figure 150, documents the postoperative corneal flattening, along
with the increase in corneal density (optical scattering). Figure 151, Figure 152, show the INTACS®
position and demarcation line on the Scheimpflug image.
Figure 150: Preoperative, postoperative (6 weeks after femtosecond-assisted intracorneal
ring segment and transepithelial crosslinking) and subtraction maps of the
average optical density and axial curvature maps
16 INTACS
®
implantation

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