Geometrical Analysis of Corneal Topography

Cavas-Martínez, Francisco; Sánchez, Ernesto de la Cruz; Martínez, José Nieto; Cañavate, Francisco J. F.; Fernández-Pacheco, Daniel G.

doi:10.1007/978-3-319-43881-8_10

Cited by 1 publication

(2 citation statements)

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“…Topographical evaluation of the corneal configuration is necessary for detecting corneal abnormality before refractive and cataract surgery. Specific geometric parameters, including asphericity, corneal curvature, and thickness values, provide different analyses for detecting early corneal abnormalities [ 1 , 2 ] . To prevent refractive surgery complications, precise preoperative evaluation is necessary to diagnose subclinical keratoconus (KCN) as the main cause of ectasia [ 2 , 3 ] .…”

Section: Introductionmentioning

confidence: 99%

“…Specific geometric parameters, including asphericity, corneal curvature, and thickness values, provide different analyses for detecting early corneal abnormalities [ 1 , 2 ] . To prevent refractive surgery complications, precise preoperative evaluation is necessary to diagnose subclinical keratoconus (KCN) as the main cause of ectasia [ 2 , 3 ] . In addition, indications for cornea cross-linking in advanced KCN depend on the accurate measurement of corneal topography variation [ 4 ] .…”

Section: Introductionmentioning

confidence: 99%

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Agreement Between Swept-source Optical Coherence Tomography and Rotating Scheimpflug Camera in Measurement of Corneal Parameters in Normal and Keratoconic Eyes

Ghassemi,

Zarei-Ghanavati,

Khastavan

et al. 2023

JOVR

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Purpose: This study aimed to assess the agreement between topographic indices of healthy subjects and keratoconus (KCN) patients using a swept-source optical coherence tomography (SS-OCT CASIA2) versus a Scheimpflug camera (Pentacam). Methods: 40 eyes of 23 patients with KCN and 40 eyes of 20 healthy subjects were included and evaluated with the CASIA2, followed by the Pentacam. Two consecutive modalities were obtained for one eye of each patient. Corneal parameters, including anterior keratometry at steep (Ks) and flat meridians (Kf), anterior astigmatism, anterior and posterior corneal elevation values, thinnest corneal thickness, and apex corneal thickness, were evaluated. Results: CASIA2 and Pentacam showed perfect agreement (95% limits of agreement (LoA): -0.22 to 0.68, 95% LoA: -1.5 to 1.44 D) and good correlation (Intraclass correlation (ICC):0.986, ICC:0.987; to 0.68, 95% LoA: -1.5 to 1.44 D) and good correlation (Intraclass correlation (ICC):0.986, ICC:0.987; P <0.01) for anterior (Ks) in normal and ectatic corneas, respectively. The cylinder amount had moderate agreement and correlation (95% LoA: -0.55 to 0.47D, ICC: 0.797, P <0.01) in normal, and moderate to strong agreement and correlation (95% LoA: -1.57 to 0.87D, ICC=0.911, P <0.01) in Keratoconic eyes. There was a fair agreement for anterior and posterior corneal elevation values in normal subjects (95% LoA: -3.09 to 4.59, 95% LoA: -6.91 to 7.31D). The thinnest corneal thickness amount had an excellent agreement in normal and KCN patients (ICC: 0.983, 0.953; respectively). Conclusions: Although the devices had different mean indices values, they had a good agreement based on the Bland–Altman plots. Since Pentacam is accepted as the standard tool for diagnosing ectatic cornea, pentacam CASIA2 is also helpful for early diagnosis of KCN.

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Section: Introductionmentioning

confidence: 99%