Rio de Janeiro Corneal Tomography and Biomechanics Study Group Dr. Ambrósio is consultant for...

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)




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.




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.




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.




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.




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 .




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.




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




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.

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