Accuracy and Precision of EyeSys and Orbscan Systems on Calibrated Spherical Test Surfaces

González-Pérez, Javier; Cerviño, Alejandro; Giráldez, María Jesús; Parafita, Manuel A.; Yebra‐Pimentel, Eva

doi:10.1097/01.icl.0000111749.04644.92

Cited by 49 publications

(18 citation statements)

References 24 publications

(11 reference statements)

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“…Although the agreement between these specific devices has not been reported, Orbscan and Placido-based devices have been proven to provide similar accuracy and precision on calibrated spherical test surfaces. 16 The following topographic data were evaluated and recorded with the 3 corneal topographic devices: corneal dioptric power in the flattest meridian for the 3-mm central zone (K1), corneal dioptric power in the steepest meridian for the 3-mm central zone (K2), and mean corneal power in the 3-mm zone (KM). Corneal aberrometry was recorded and analyzed only for those patients examined with the CSO topography system (279 eyes), because this device was the only one with the capability to calculate directly this specific information.…”

Section: Methodsmentioning

confidence: 99%

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Vega-Estrada

Alió

Brenner

et al. 2013

American Journal of Ophthalmology

115

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PURPOSE: To analyze the outcomes of intracorneal ring segment (ICRS) implantation for the treatment of keratoconus based on preoperative visual impairment. DESIGN: Multicenter, retrospective, nonrandomized study.METHODS: A total of 611 eyes of 361 keratoconic patients were evaluated. Subjects were classified according to their preoperative corrected distance visual acuity (CDVA) into 5 different groups: grade I, CDVA of 0.90 or better; grade II, CDVA equal to or better than 0.60 and worse than 0.90; grade III, CDVA equal to or better than 0.40 and worse than 0.60; grade IV, CDVA equal to or better than 0.20 and worse than 0.40; and grade plus, CDVA worse than 0.20. Success and failure indices were defined based on visual, refractive, corneal topographic, and aberrometric data and evaluated in each group 6 months after ICRS implantation.RESULTS: Significant improvement after the procedure was observed regarding uncorrected distance visual acuity in all grades (P < .05). CDVA significantly decreased in grade I (P < .01) but significantly increased in all other grades (P < .05). A total of 37.9% of patients with preoperative CDVA 0.6 or better gained 1 or more lines of CDVA, whereas 82.8% of patients with preoperative CDVA 0.4 or worse gained 1 or more lines of CDVA (P < .01). Spherical equivalent and keratometry readings showed a significant reduction in all grades (P £ .02). Corneal higher-order aberrations did not change after the procedure (P ‡ .05).CONCLUSIONS: Based on preoperative visual impairment, ICRS implantation provides significantly better results in patients with a severe form of the disease. K ERATOCONUS IS AN ECTATIC DEBILITATING corneal disorder characterized by a progressive corneal thinning that results in corneal protrusion, irregular astigmatism, and decreased vision. 1 A variety of options have been described for the management of this pathologic condition, such as rigid gas-permeable contact lenses, 2 corneal collagen cross-linking, 3 intracorneal ring segment implantation, 4-11 or keratoplasty. 12 In a number of studies intracorneal ring segments (ICRS) have been demonstrated to be effective in improving visual acuity and reducing the refractive error and the mean keratometry in selected cases of keratoconic eyes. 4-11 Such a positive therapeutic effect is considered to be based on the induction of a remodeling of the corneal anterior and posterior surface's topography, which improves the optical quality of the cornea and reduces the optical aberrations, with consequent improvement in best-corrected visual acuity. [4][5][6][7][8][9][10][11] Although in the healthy cornea, the sectorial arcuate addition to the corneal local volume caused by these implants at the corneal midperiphery induces a flattening of the central cornea in an arc-shortening effect, with the consequence of a decrease in myopic spherical equivalent attributable to the overall reduction in the optical power of the cornea, 13 such corneal modeling effect may be different in structurally abnormal corneas such as in keratoco...

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Section: Methodsmentioning

confidence: 99%

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Vega-Estrada

Alió

Brenner

et al. 2013

American Journal of Ophthalmology

115

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“…The Orbscan II and CSO have proved to have a similar accuracy and precision on calibrated spherical tests surfaces. 23 Data for the whole group of 58 cases were used to identify interesting keratometric variables, like a new keratometric parameter defined and named by us as K-factor (K F , defined as K 2 [K 2 À K 1 ]) or visual variables, like CDVA, but for the rest of the analysis (before and after evolution, and the development of the mathematical model) we preferred to focus only on the 48 cases measured with the CSO to have a more homogeneous group, and include the information for corneal aberrations and apical keratometry (AK) not provided by the OrbScan. Similar results for the evolution of K F and CDVA, and their correlations with the visual changes were obtained for the group of 58 cases and a less predictive model was obtained without using AK.…”

Section: Methodsmentioning

confidence: 99%

Intracorneal Ring Segment in Keratoconus: A Model to Predict Visual Changes Induced by the Surgery

Peña-García

Vega-Estrada

Barraquer

et al. 2012

Invest. Ophthalmol. Vis. Sci.

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“…Diferenças dos valores comparados pelos dois sistemas devem ser levadas em consideração. Em trabalho comparativo do videoceratoscópio EyeSys com o Orbscan II ® não houve diferença estatisticamente significante relacionada à acurácia e precisão dos instrumentos (12) . …”

Section: Discussionunclassified

Comparação entre dois sistemas de análise de topografia corneana

Kuntz¹,

Luz²,

Dalfré³

et al. 2012

Rev. bras.oftalmol.

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Accuracy and Precision of EyeSys and Orbscan Systems on Calibrated Spherical Test Surfaces

Cited by 49 publications

References 24 publications

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Intracorneal Ring Segment in Keratoconus: A Model to Predict Visual Changes Induced by the Surgery

Comparação entre dois sistemas de análise de topografia corneana

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