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Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Dr. Ambrósio is consultant for Oculus Optikgeräte GmbH (Wetzlar, Germany)
Agreement of Artificial Intelligence Topographic Diagnosis From
Placido and Scheimpflug Systems
Leonardo N. Pimentel, MD1,2; Isaac Ramos, MD1,2 ; Bruno Valbon,
MD1,2
Ana Laura C. Canedo, MD1,2 Renato Ambrósio Jr., MD, PhD1,2
1 – Instituto de Olhos Renato Ambrósio (Brazil)2 – Rio de Janeiro Corneal Tomography and Biomechanics Study Group (Brazil)
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Purpose To compare artificial intelligence in
the axial curvature maps (sagittal), obtained by the topographic survey of Placido reflection system and those obtained using the rotating Scheimpflug system.
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Methods Retrospective study. 449 patients (898 eyes) with axial
topography by the Nidek Corneal Navigator System using the Magellan Placido’s Corneal Topographer and axial topography by the Pentacam using the Scheimpflug system.
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Placido’s Corneal Topographer
The corneal topography based on the Placido disk technology is a method that analyzes the anterior curvature assisted by a computer through the recording, capture and processing of the reflected rings that are illuminated and projected onto the cornea. Analysis of geometric shape of the
reflected rings provides twenty two thousands measuring points that allow the construction of a topographic map.
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Scheimpflug Corneal Topographer
The Scheimpflug scanning provides considerably larger area measurement of the cornea compared with Placido’s topography systems. It is also not sensitive from irregularities on
the corneal reflex and interference from the tear film. The exam generates curvature maps from the front and back corneal.
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Methods
CASO # N A KCS KC PMD PKP MRS HRS OTH M1 99 02 98,4 0,6 03 99 34 94,2 4,8 35 1,2 97,8 26 99 27 98,1 0,9 08 97,4 1,6 09 96,7 2,3 0
10 99 011 99 012 99 013 77,8 21,2 014 99 215 99 016 99 0
ArtificialIntelligence
N ou AST
KCS KC ou PMD
PKP, MRS ou HRS
OTH
Number corresponding
0 0,5 1 3 2
To compare the artificial diagnoses, the corresponding numbers were used, then the percentage of agreement was observed. Was used Artificial intelligence by
Nidek Corneal Navigator .
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
MethodsCASE TKC
1 # -2 # -3 # -4 # poss,5 # poss,6 # poss,7 # 3-48 # 3-49 # 3,PMD?
10 # 3,PMD?11 # Abnorm,12 # Abnorm,13 # Abnorm,14 # Abnorm,15 # C,Surg.?16 # C,Surg.?17 # C,Surg.?
Was used TKC system by Pentacam (Oculus). The pacients that made
hypermetropic Lasik were excluded from the Study, because TKC system didn`t have program for this cases.
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
Results Observed agreement between
diagnoses Artificial by Maguellan (Nidek Cornea Navigator) and TKC from Pentacam (Oculus) in 525 eyes (58%) and disagreement in 373 eyes (48%). The agreement between diagnoses Artificial by maguellan and TKC system by Pentacam was better in normal and keratoconus cases, while was worse in suspect cases.
525 Eyes
Rio de Rio de Janeiro Janeiro Corneal Corneal
Tomography Tomography andand
BiomechanicsBiomechanicsStudy GroupStudy Group
ConclusionsThe axial topography by the Pentacam
using Scheimpflug system is not sensitive from irregularities on the corneal reflex and interference from the tear film. Especially in suspicious cases, is
necessary additional data from tomography or biomechanics study to enhance the sensitivity and specificity to detect ectasia.