Search

Your search keyword '"Loujain Al-Soboh"' showing total 2 results
Start Over Author "Loujain Al-Soboh"
2 results on '"Loujain Al-Soboh"'

1. Individual vs simultaneous macular and optic disc measurements with spectral domain optical coherence tomography in glaucoma and healthy eyes

Author

Abinaya Priya Venkataraman, Loujain Al-Soboh, Johan Hedström, and Alberto Domínguez-Vicent

Subjects
Medicine, Science
Abstract

Abstract We assessed the repeatability and agreement of ganglion cell complex (GCC) in the macular area and the peripapillary retinal nerve fiber layer (ppRNFL) with individual and combined macula and disc scans. The macular GCC and ppRNFL thicknesses from 34 control eyes and 43 eyes with glaucoma were measured with the Canon Optical Coherence Tomography (OCT) HS-100. Two repeated measurements were performed with both scan modes. The repeatability limit (Rlim) and agreement analysis were performed. The individual scan showed better repeatability than the combined scan in both groups. However, the differences in the Rlim for the GCC in most sectors were lower than 3 μm (axial resolution of the OCT), and this was larger than 3 μm for most of the ppRNFL sectors. The mean differences in the thickness between both scan modes for the GCC and ppRNFL measurements were less than 3 and 6 μm, respectively. The interval of the limits of agreement was about 10 μm in some sectors for the GCC, and about 40 and 60 μm in some sectors in controls and glaucoma eyes, respectively. Both scan modes showed good repeatability in both groups. The agreement results suggest that the scan modes cannot be used interchangeably.

Published
2024
Full Text
View/download PDF

2. Effect of Instrument Design and Technique on the Precision and Accuracy of Objective Refraction Measurement

Author

Loujain Al-Soboh, Rune Brautaset, Abinaya Priya Venkataraman, and Alberto Domínguez-Vicent

Subjects
Accuracy and precision, Fogging, genetic structures, lcsh:Medicine, 01 natural sciences, Article, 010309 optics, 03 medical and health sciences, 0302 clinical medicine, Optics, 0103 physical sciences, Medicine, Reproducibility, Monocular, refraction, fogging, business.industry, lcsh:R, General Medicine, Repeatability, Objective refraction, Refraction, Subjective refraction, monocular/binocular view, 030221 ophthalmology & optometry, precision, business
Abstract

Background: To evaluate the precision and accuracy of objective refraction measurement obtained with combinations of instrument design and technique. We also compared the performance of the instruments with subjective refraction measurements. Method and analysis: The objective refraction was measured in 71 subjects with three autorefractometers that have different designs and measurement principles (binocular with fogging, binocular without fogging, and monocular with fogging). Repeatability and reproducibility metrics were calculated for the objective refraction measurements. The agreement of the objective refraction measurements between the three instruments and the agreement with the subjective refraction measurements were evaluated. Results: All three autorefractometers had repeatability and reproducibility limits smaller than 0.70D. The smallest difference (0.10D) in the spherical equivalent was seen between the two binocular instruments. Compared with the subjective refraction, the binocular without fogging technique had the smallest mean difference in spherical equivalent (&lt, 0.20D) whereas the binocular fogging technique had the smallest limit of agreement interval (1.00D). For all comparisons, the mean difference and limit of agreement interval for the cylindrical components were lower than 0.10D and 0.75D, respectively. Conclusion: All three instruments evaluated had good repeatability and reproducibility. The binocular fogging technique provided the best agreement with subjective refraction.

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results