Measurement of Angle Kappa Using Ultrasound Biomicroscopy and Corneal Topography

Yeo, Joon Hyung; Moon, Nam Ju; Lee, Jeong Kyu

doi:10.3341/kjo.2016.0021

Cited by 24 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, a report designed a new method using UBM and corneal topography to calculate the angle kappa and compared the new method with Orbscan II, which found good correlations and agreement between the two methods. But there was statistically signi cant difference in angle kappa measured by the devices [2]. One explanation for the discrepancy between measurements might be the different principles in different devices, producing slightly different results.…”

Section: Discussionmentioning

confidence: 84%

See 1 more Smart Citation

Comparison of Preoperative Angle Kappa Measurements in the Eyes of Cataract Patients Obtained from Pentacam Scheimpflug System, Optical Low-Coherence Reflectometry, and Ray-Tracing Aberrometry

Qin

Yuan

Wang

et al. 2020

Preprint

View full text Add to dashboard Cite

Background Angle kappa plays a vital role in the implantation of multifocal intraocular lens (MIOLs). Large angle kappa is related to higher risk of postoperative photic phenomena. This study aims to compare preoperative angle kappa in the eyes of cataract patients obtained from Pentacam Scheimpflug system (Pentacam), optical low-coherence reflectometry (Lenstar), and ray-tracing aberrometry (iTrace). Methods One hundred thirteen eyes of 113 patients with cataracts were included. Each eye was examined by the devices to obtain angle kappa (X-Y Cartesian coordinates) and pupil diameter. When considering dependent eyes for one individual, angle kappa in right eyes and left eyes should be analyzed separately. The difference, correlation, and agreement between values for horizontal and vertical components of angle kappa were evaluated by paired t-tests, Pearson or Spearman tests, and Bland‑Altman analysis, respectively. Results No significant differences in the pupil diameter were found between Pentacam and Lenstar or Lenstar and iTrace in both eyes (P > 0.05). Positive angle kappa (nasal light reflex) was found in most cataract patients (79.25–84.91%) through 3 different devices in both eyes. The significant differences of angle kappa were not found between Pentacam and Lenstar compared to Pentacam and iTrace or Lenstar and iTrace in both eyes (P > 0.05). Pentacam and Lenstar showed strong correlation in the horizontal and vertical components of angle kappa compared to Pentacam and iTrace or Lenstar and iTrace in both eyes (r = 0.906 to 0.939). The 95% limits of agreement (LoA) in the horizontal and vertical components of angle kappa with Pentacam and Lenstar were narrower respect to Pentacam and iTrace or Lenstar and iTrace in both eyes. Conclusions There were no differences, strong correlation, and good agreement in angle kappa with Pentacam and Lenstar for cataract patients. Based on these findings, the measurement of preoperative angle kappa in the eyes of patients with cataracts by Pentacam and Lenstar has good agreement, and can be used interchangeably, but caution is warranted for outcomes-based iTrace that report angle kappa.

show abstract

Section: Discussionmentioning

confidence: 84%

“…Also, angle kappa can be classi ed as horizontal or vertical direction on the basis of X and Y Cartesian values of angle kappa. A positive angle kappa of average 5.0° is generally found in normal human eye [2].…”

mentioning

confidence: 93%

Comparison of Preoperative Angle Kappa Measurements in the Eyes of Cataract Patients Obtained from Pentacam Scheimpflug System, Optical Low-Coherence Reflectometry, and Ray-Tracing Aberrometry

Qin

Yuan

Wang

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…London and Wick reported a mean angle kappa of 5.08° . Yeo et al reported mean angle kappa as 3.98° ± 1.12° . The results may vary according to age, race and the patient's refractive status.…”

Section: Discussionmentioning

confidence: 99%

“…They also revealed a significant correlation between positive refractive errors and large positive angle kappa values which indicates that hyperopic patients have a larger angle kappa when compared to emmetropes and myopes . Yeo et al used ultrasound biomicroscopy and corneal topography to measure angle kappa and their results showed good reliability . Newer devices are available such as Galilei (Ziemer Ophthalmic Systems), and OPD Scan II (Nidek) to evaluate angle kappa.…”

Section: Discussionmentioning

confidence: 99%

“…13 Yeo et al used ultrasound biomicroscopy and corneal topography to measure angle kappa and their results showed good reliability. 14 Newer devices are available such as Galilei (Ziemer Ophthalmic Systems), and OPD Scan II (Nidek) to evaluate angle kappa. When angle kappa is not measured automatically by automated instruments, the distance between corneal vertex and pupil centre (x and y Cartesian values) can also be used to estimate angle kappa.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Estimation of angle kappa and pupil barycentre configuration in myopic tilted disc syndrome

Çankaya

Özsoy

Demirel

et al. 2020

Clinical and Experimental Optometry

View full text Add to dashboard Cite

Background To evaluate the angle kappa and pupil barycentre configuration in patients with myopic tilted disc syndrome (TDS). Methods Thirty‐five eyes of 35 patients with TDS were included in the study. Thirty‐five eyes of 35 age‐ and sex‐matched healthy subjects were enrolled in the control group. All measurements were performed with the Lenstar LS 900. Angle kappa was calculated according to Pythagorean theorem using the x and y co‐ordinates of the pupil centre. Pupil dx and pupil dy values (pupil dx: x co‐ordinate of pupil centre relative to corneal apex, pupil dy: y co‐ordinate of pupil centre relative to corneal apex) were used to evaluate the pupil barycentre configuration. Central corneal thickness, white to white (cornea diameter), pupil diameter, anterior chamber depth, lens thickness, and axial length were also measured. Results The calculated mean angle kappa distance was 0.27 ± 0.15 mm in the TDS group and 0.29 ± 0.23 mm in the control group (p = 0.42). The mean pupil dx was −0.01 ± 0.24 mm in the TDS group and −0.17 ± 0.14 mm in the control group (p = 0.006). The mean pupil dy was −0.02 ± 0.13 mm in the TDS group and −0.05 ± 0.22 mm in the control group (p = 0.65). Conclusions The pupil barycentre in TDS cases was statistically significantly closer to the corneal vertex on the horizontal plane compared to the control group. However, there was no statistically significant differences in terms of angle kappa and pupil dy values between the groups. According to our results, refractive surgery can be performed safely with respect to complications related to decentration of ablation zone and decentration of multifocal intraocular lenses in these groups of patients.

show abstract

Effect of the kappa angle on depth of focus after implantation of the TECNIS Symfony intraocular lens

et al. 2021

View full text Add to dashboard Cite

Measurement of Angle Kappa Using Ultrasound Biomicroscopy and Corneal Topography

Cited by 24 publications

References 15 publications

Comparison of Preoperative Angle Kappa Measurements in the Eyes of Cataract Patients Obtained from Pentacam Scheimpflug System, Optical Low-Coherence Reflectometry, and Ray-Tracing Aberrometry

Comparison of Preoperative Angle Kappa Measurements in the Eyes of Cataract Patients Obtained from Pentacam Scheimpflug System, Optical Low-Coherence Reflectometry, and Ray-Tracing Aberrometry

Estimation of angle kappa and pupil barycentre configuration in myopic tilted disc syndrome

Effect of the kappa angle on depth of focus after implantation of the TECNIS Symfony intraocular lens

Contact Info

Product

Resources

About