Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Ruiz-Belda, Clara; Piñero, David P.; Ruiz-Fortes, Pedro; Soto-Negro, Roberto; Moya, M. Moya; Pérez-Cambrodí, Rafael J.; Artola, Alberto

doi:10.1007/s00417-015-3105-0

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…Many studies have reported the morphological changes of anterior segment after laser peripheral iridotomy . However, the advantage of the Scheimpflug‐Placido disc topographer is that it is a non‐contact, non‐invasive imaging modality which allows measurement of anterior segment changes before and after laser peripheral iridotomy.…”

Section: Discussionmentioning

confidence: 99%

“…A recent study evaluated intra‐session repeatability of iridocorneal angle measurements of different meridians (0°, ±10°, ±20° and ±30°) in the nasal and temporal areas in 43 healthy eyes (age range, 36–79 years) using the Sirius Scheimpflug photography‐based system (Costruzione Strumenti Oftalmici, Florence, Italy). Mean co‐efficient of variation ranged from 1.36 ± 1.05 per cent (nasal 0° position) to 10.92 ± 13.95 per cent (nasal −20° position) and intraclass correlation co‐efficient values ranged from 0.778 to 0.972.…”

Section: Discussionmentioning

confidence: 99%

“…This instrument provides different anatomical measurements of the anterior segment. A previous study has evaluated the intra‐session repeatability of the iridocorneal angle measurements in healthy eyes, using the glaucoma analysis mode of the Sirius Scheimpflug‐Placido disc topographer …”

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confidence: 99%

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Anterior segment morphology after laser iridotomy in primary angle closure suspects

Mansoori¹,

Balakrishna

2018

Clinical and Experimental Optometry

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Laser peripheral iridotomy induces significant changes in the 3-D anterior segment morphology in primary angle closure suspect patients. The Scheimpflug-Placido disc topographer provides reproducible measurements of the iridocorneal angle and other parameters measured and hence, may become clinically useful for non-invasive detection of potentially occludable angles. Predictors of iridocorneal angle widening after iridotomy were older age and anterior chamber volume.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Anterior segment morphology after laser iridotomy in primary angle closure suspects

Mansoori¹,

Balakrishna

2018

Clinical and Experimental Optometry

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“…The limitations of the present study are as follows. First, a single measurement was performed on all patients because repeatability of ACA [23, 24], central ACD [10–12, 23, 25], and ACV [25] measurements of the Sirius in unoperated eyes and those after refractive surgery [25] has been confirmed by other studies. Second, we did not verify accommodative alterations because of the retrospective nature of this study.…”

Section: Discussionmentioning

confidence: 99%

Anterior Chamber Angle and Volume Do Not Change after Myopic Laser-Assisted In Situ Keratomileusis in Young Patients

Yassa¹,

Ünlü

2018

Journal of Ophthalmology

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Purpose We aimed to investigate whether anterior chamber angle, depth, and volume change after myopic laser-assisted in situ keratomileusis (LASIK) in young patients. Methods This retrospective study included 29 eyes of 29 patients (15 females and 14 males) between the ages of 18 and 39 years who underwent LASIK for the treatment of myopia. In addition to complete ophthalmic examination, anterior chamber angle (ACA), central anterior chamber depth (ACD), and anterior chamber volume (ACV) were measured by using a Sirius rotating Scheimpflug camera combined with Placido disc corneal topography (CSO, Florence, Italy). Preoperative and postoperative values were compared using paired t-tests. Linear regression was used to evaluate the relationship between changes in refraction and changes in ACA, ACD, and ACV as well as between attempted maximum ablation depth and changes in ACA, ACD, and ACV. Results The mean age of the study population was 25.5 ± 6.2 years. The mean preoperative and postoperative spherical equivalent values were −3.30 ± 1.92 D and −0.18 ± 0.29 D, respectively. ACV and ACA were not significantly changed after surgery; however, central ACD was significantly decreased (preoperatively = 3.366 ± 0.316 mm vs postoperatively = 3.3 ± 0.298 mm) with a mean difference of 0.066 ± 1.121 mm. There were no significant relationships between changes in refraction and anterior segment dimensions or between attempted maximum ablation depth and anterior segment dimensions. Conclusion Measurements with Sirius showed that ACA and ACV did not change; however, central ACD significantly decreased after myopic LASIK in young patients, indicating that the preoperative central ACD value should not be used interchangeably with the postoperative central ACD value.

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“… 1 Recent studies have proved that Sirius and similar corneal topography systems are repeatable for healthy subjects. 1 , 2 , 3 , 4 , 5 …”

Section: Introductionmentioning

confidence: 99%

Does Dry Eye Affect Repeatability of Corneal Topography Measurements?

Doğan

Gürdal

Köylü

2018

tjo

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Objectives:The purpose of this study was to assess the repeatability of corneal topography measurements in dry eye patients and healthy controls.Materials and Methods:Participants underwent consecutive corneal topography measurements (Sirius; Costruzione Strumenti Oftalmici, Florence, Italy). Two images with acquisition quality higher than 90% were accepted. The following parameters were evaluated: minimum and central corneal thickness, aqueous depth, apex curvature, anterior chamber volume, horizontal anterior chamber diameter, iridocorneal angle, cornea volume, and average simulated keratometry. Repeatability was assessed by calculating intra-class correlation coefficient.Results:Thirty-three patients with dry eye syndrome and 40 healthy controls were enrolled to the study. The groups were similar in terms of age (39 [18-65] vs. 30.5 [18-65] years, p=0.198) and gender (M/F: 4/29 vs. 8/32, p=0.366). Intra-class correlation coefficients among all topography parameters within both groups showed excellent repeatability (>0.90).Conclusion:The anterior segment measurements provided by the Sirius corneal topography system were highly repeatable for dry eye patients and are sufficiently reliable for clinical practice and research.

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Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Cited by 12 publications

References 23 publications

Anterior segment morphology after laser iridotomy in primary angle closure suspects

Anterior segment morphology after laser iridotomy in primary angle closure suspects

Anterior Chamber Angle and Volume Do Not Change after Myopic Laser-Assisted In Situ Keratomileusis in Young Patients

Does Dry Eye Affect Repeatability of Corneal Topography Measurements?

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