Intrasession repeatability of ocular anatomical measurements obtained with a multidiagnostic device in healthy eyes

Piñero, David P.; Cabezos, Inmaculada; López-Navarro, Alberto; Sáiz, Dolores de Fez; Caballero, María Teresa Caballero; Camps, Vicente J.

doi:10.1186/s12886-017-0589-x

Cited by 14 publications

(22 citation statements)

References 23 publications

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“…The results of this study confirm previous results on the consistency of pachymetric and IA measurements obtained with the VX120 system. 5 …”

Section: Discussionmentioning

confidence: 99%

“…The VX120 (Visionix Luneau, Chartres, France) is new non-invasive multi-diagnostic platform that combines refraction (Hartmann–Shack based autorefractometer), 2 , 3 simulated keratometry (based on Placido disk videokeratography), 3 , 4 non-invasive stationary Scheimpflug based pachymetry and Hartmann–Shack wavefront aberrometry as well as other functions not investigated in this study. 4 , 5 …”

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confidence: 99%

“…Likewise, the same research group has demonstrated recently that the VX120 system is also able to provide consistent measurements of anatomical parameters of the anterior segment, such as anterior chamber depth, central and peripheral pachymetry and iridocorneal angle. 5 However, validity has yet to be assessed for this device.…”

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confidence: 99%

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Validation of refraction and anterior segment parameters by a new multi-diagnostic platform (VX120)

Gordon‐Shaag

Piñero

Kahloun

et al. 2018

Journal of Optometry

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BackgroundThe VX120 (Visionix Luneau, France) is a novel multi-diagnostic platform that combines Hartmann–Shack based autorefraction, Placido-disk based corneal-topography and anterior segment measurements made with a stationary-Scheimpflug camera. We investigate the agreement between different parameters measured by the VX120 with accepted or gold-standard techniques to test if they are interchangeable, as well as to evaluate the repeatability and reproducibility.MethodsThe right-eyes of healthy subjects were included in the study. Autorefraction of the VX120 was compared to subjective refraction. Agreement of anterior segment parameters was compared to the Sirius (CSO, Italy) including autokeratometry, central corneal thickness (CCT), iridiocorneal angle (IA). Inter and intra-test repeatability of the above parameters was assessed. Results were analyzed using Bland and Altman analyses.ResultsA total of 164 eyes were evaluated. The mean difference between VX120 autorefraction and subjective refraction for sphere, spherical equivalent (SE), and cylinder was 0.01 ± 0.43 D, 0.14 ± 0.47 D, and −0.26 ± 0.30 D, respectively and high correlation was found to all parameter (r > 0.75) except for J45 (r = 0.61). The mean difference between VX120 and the Sirius system for CCT, IA, and keratometry (k1 and k2) was −3.51 ± 8.64 μm, 7.6 ± 4.2°, 0.003 ± 0.06 mm and 0.004 ± 0.04 mm, respectively and high correlation was found to all parameter (r > 0.97) except for IA (r = 0.67). Intrasession repeatability of VX120 refraction, CCT, IA and keratometry yielded low within-subject standard deviations. Inter-session repeatability showed no statistically significant difference for most of the parameters measured.ConclusionsThe VX120 provides consistent refraction and most anterior segment measurements in normal healthy eyes, with high levels of intra and inter-session repeatability.

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“…The results of this study confirm previous results on the consistency of pachymetric and IA measurements obtained with the VX120 system. 5 …”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Validation of refraction and anterior segment parameters by a new multi-diagnostic platform (VX120)

Gordon‐Shaag

Piñero

Kahloun

et al. 2018

Journal of Optometry

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“…The VX120 device is a multi-diagnostic tool which combines Hartmann–Shack refractive and aberrometric measurements, a Placido disk to obtain a topographic analysis, an air-puff system to measure intraocular pressure (IOP), and a Scheimpflug camera to provide anatomical measurements in an automated mode. This device has been described and studied by many authors showing good repeatability for refractive [ 10 , 11 , 12 ], anatomical [ 13 ], corneal, ocular, and internal aberrometric [ 10 , 11 , 14 ], and corneal topographic parameters [ 11 , 12 , 14 ].…”

Section: Methodsmentioning

confidence: 99%

Relationship between Axial Length and Corneo-Scleral Topography: A Preliminary Study

2021

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The main objective of the current study was to investigate further the relationship of the overall length of the eye with a great variety of anterior segment parameters, including scleral geometry. A total of 64 eyes of 32 participants with ages from 12 to 52 years were included in this prospective non-randomized single-center study. All participants underwent a complete eye examination, including an analysis of corneo-scleral shape with a Fourier-domain profilometer. A strong negative correlation was found between axial length and temporal-nasal ocular sagittal height difference for different chord lengths. For the right eye, a consistent and stable linear model was obtained to predict the axial length from the spherical equivalent, the corneal diameter, the high-order aberrations root mean square, and the minimum sagittal height for 13- and 14-mm chord. For the left eye, a model was obtained to predict the axial length from the spherical equivalent and the mean corneal curvature, including other parameters such as corneal diameter or high-order aberrations, depending on the chord length, considered for estimating the sagittal height values. More studies with larger samples are needed to confirm these preliminary outcomes.

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“…A new multidiagnostic platform, the VX120 system (Visionix-Luneau Technologies, Chartres, France), has been recently developed allowing the clinician to obtain automatic measurements of corneal topography, anterior segment anatomical parameters, corneal, internal and ocular aberrations, intraocular pressure (IOP), and pupil diameter under different light conditions. Different studies have been conducted to validate some of these measurements provided by this multidiagnostic system in healthy eyes [ 11 – 13 ], but there is not specific validation of its pupil size measurements. The aim of the current study was to evaluate the intrasession repeatability of pupil size measurements provided by this multidiagnostic platform in a large sample of healthy eyes.…”

Section: Introductionmentioning

confidence: 99%

Intrasession repeatability of pupil size measurements under different light levels provided by a multidiagnostic device in healthy eyes

et al. 2020

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Background: The measurement of the pupillary function is an indispensable test in some eye examinations, being necessary the evaluation of the precision of instruments performing such measures. The aim of this study was to evaluate the intrasession repeatability of pupil size measurements provided by a multidiagnostic platform in a large sample of healthy eyes. Methods: This prospective study enrolled 100 healthy eyes of 100 patients, with ages ranging from 23 to 65 years old. Repeated pupil size measures under photopic (P, 220 lx), mesopic (M, 160 lx), low mesopic (L, 70 lx), and scotopic conditions (S, 1 lx) were obtained with the VX120 system (Visionix-Luneau Technologies, Chartres, France) after a complete eye exam. Likewise, pupil size was also measured once in the fellow eye in a total of 75 eyes. The level of intrasession variability as well as differences between fellow eyes were evaluated. Results: Most of differences between repeated measures did not exceed 0.5 mm (82% of S and 100% of P below this value). No significant differences between these repeated measures were found for S (p = 0.099) and L (p = 0.751). However, statistically significant differences were found between repeated measures for M (p = 0.002) and P (p = 0.003). The analysis of clinical relevance of differences between pairs (Passing-Bablok) only confirmed the clinical relevance of differences between the first and second repeated measurement of M. Concerning the comparative analysis between fellow eyes, no statistically significant differences in pupil size were found between right and left eyes in any light condition evaluated (p ≥ 0.227). Conclusions: The VX120 system can provide consistent measurements of pupil size under scotopic, low mesopic and photopic conditions, with a relative limitation under mesopic conditions.

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Intrasession repeatability of ocular anatomical measurements obtained with a multidiagnostic device in healthy eyes

Cited by 14 publications

References 23 publications

Validation of refraction and anterior segment parameters by a new multi-diagnostic platform (VX120)

Validation of refraction and anterior segment parameters by a new multi-diagnostic platform (VX120)

Relationship between Axial Length and Corneo-Scleral Topography: A Preliminary Study

Intrasession repeatability of pupil size measurements under different light levels provided by a multidiagnostic device in healthy eyes

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