The effect of different angle kappa on higher-order aberrations after small incision lenticule extraction
This study aimed to compare higher-order aberrations (HOAs) after small incision lenticule extraction (SMILE) in patients with different angle kappa. This is a retrospective report in which 341 right eyes of 341 patients who were subjected to SMILE, which used coaxially sighted corneal light reflex (CSCLR) as the treatment zone centered, treated by the same experienced surgeon (LHB) for correction of myopia and myopic astigmatism, preoperative and postoperative spherical equivalent (SE), angle kappa, total higher-order aberrations (total HOA), spherical aberration (SA), vertical coma (VC), horizontal coma (HC), oblique tre...
Source: Lasers in Medical Science - November 28, 2023 Category: Laser Surgery Source Type: research
Corneal refractive error and astigmatism in patients aged 6 to 18 years with a history of retinopathy of prematurity and birth weight of & lt;1500 g
ConclusionCR was significantly higher in the sr-ROP (p=0.013) and PC-ROP (p<0.001) groups than in the NBW group. The PC-ROP group had significantly more AS than the sr-ROP group. There was a strong correlation between the anterior and posterior CR and AS. (Source: Japanese Journal of Ophthalmology)
Source: Japanese Journal of Ophthalmology - November 25, 2023 Category: Opthalmology Source Type: research
Accuracy of toric intraocular lens calculations using estimated versus measured posterior corneal astigmatism.
Toric intraocular lenses (tIOL) provide the opportunity to reduce postoperative refractive astigmatism and improve visual quality.1 Nonetheless, accurately predicting the final refractive astigmatism remains a challenge. Previous studies have stressed the importance of posterior corneal astigmatism (PCA) in predicting postoperative astigmatism.2,3 Traditionally, a fixed ratio between the anterior and posterior corneal curvature was assumed to estimate the total corneal astigmatism. However, Koch et al. (Source: American Journal of Ophthalmology)
Source: American Journal of Ophthalmology - November 22, 2023 Category: Opthalmology Authors: Maartje H.M. Segers, Adi Abulafia, Valentijn S.C. Webers, Jan-Willem Verstraaten, Magali M.S. Vandevenne, Tos T.J.M. Berendschot, Yoav Ken-Tor, Yuval Benjamini, Frank J.H.M. van den Biggelaar, Graham D. Barrett, Rudy M.M.A. Nuijts, Mor M. Dickman Tags: Original Articles Source Type: research
Modelling ready-made spectacle coverage for children and adults using a large global database
Conclusion
Despite their advantages in cost and convenience, coverage delivered by RMS is limited under current prescribing guidelines, particularly for children and presbyopic adults. Interchangeable designs do little to remediate this, despite extending coverage for anisometropia. Our free application allows users to estimate RMS coverage in specific target populations. (Source: British Journal of Ophthalmology)
Source: British Journal of Ophthalmology - November 22, 2023 Category: Opthalmology Authors: Chan, V. F., Wright, D. M., Mavi, S., Dabideen, R., Smith, M., Sherif, A., Congdon, N. Tags: Open access Original articles - Clinical science Source Type: research
Effect of spectacle lenses with aspherical lenslets on choroidal thickness in myopic children: a 2-year randomised clinical trial
Conclusions
The ChT of the macula decreased after 2 years of myopia progression with SVL. Wearing spectacle lenses with aspherical lenslets reduced or abolished the ChT thinning and HAL had a more pronounced effect.
Trial registration number
ChiCTR1800017683. (Source: British Journal of Ophthalmology)
Source: British Journal of Ophthalmology - November 22, 2023 Category: Opthalmology Authors: Huang, Y., Li, X., Wu, J., Huo, J., Zhou, F., Zhang, J., Yang, A., Spiegel, D. P., Chen, H., Bao, J. Tags: Open access Original articles - Clinical science Source Type: research
Basic acquired nonaccommodative esotropia patients managed with surgery; a study of 2102 patients
DISCUSSION: The higher astigmatism, lower CDVA, greater angle of horizontal deviation, and higher frequency of amblyopia were found in the preoperative examinations of BANAET patients managed with two or more surgeries compared with cases managed with only one surgery.PMID:37982308 | DOI:10.1080/09273972.2023.2283109 (Source: Strabismus)
Source: Strabismus - November 20, 2023 Category: Research Authors: Mohamad Reza Akbari Alaa Alghurab Elham Azizi Masoud Khorrami-Nejad Source Type: research
Sensors, Vol. 23, Pages 9273: Aberration Theory of a Flat, Aplanatic Metalens Doublet and the Design of a Meta-Microscope Objective Lens
-Je Kim
A theoretical approach for reducing multiple monochromatic aberrations using a flat metalens doublet is proposed and verified through ray tracing simulations. The theoretical relation between the Abbe sine condition and the generalized Snell&rsquo;s law is revealed in the doublet system. Starting from the Abbe aplanat design, minimization conditions of astigmatism and field curvature are derived. Based on the theory, a metalens doublet is semi-analytically optimized as a compact, practical-level meta-microscope objective lens working for a target wavelength. The proposed approach also reveals how to red...
Source: Sensors - November 19, 2023 Category: Biotechnology Authors: Woojun Han Jinsoo Jeong Jaisoon Kim Sun-Je Kim Tags: Article Source Type: research
Refractive and corneal astigmatism in Chinese 4 –15 years old children: prevalence and risk factors
To investigate the prevalence and risk factors of refractive astigmatism (RA) and corneal astigmatism (CA) in preschool children and school-aged children in Shanghai, China. (Source: BMC Ophthalmology)
Source: BMC Ophthalmology - November 10, 2023 Category: Opthalmology Authors: Luoli Zhang, Li Zeng, Yuhao Ye, Zhe Zhang, Fang Liu, Yiyong Xian, Yang Shen, Ling Sun, Ye Xu, Ke Zheng, Xingtao Zhou and Jing Zhao Tags: Research Source Type: research
The changes and causes of asthenopia after ICL implantation
ConclusionThe symptoms of asthenopia aggravated transiently after ICL implantation surgeries, but improved gradually with time. AF and NBUT were important factors affecting the changes of asthenopia. (Source: International Ophthalmology)
Source: International Ophthalmology - November 4, 2023 Category: Opthalmology Source Type: research
Comparison between IOL MASTER 500 and MYAH with vector analysis in low and mild anterior corneal astigmatism
CONCLUSIONS: The instruments appear to be interchangeable for measurements of AL, keratometry, and magnitude of ACA with high agreement between the two devices. Also, in the presence of low astigmatism, the two instruments give the same results in terms of ACA.PMID:37919941 | DOI:10.1177/11206721231210895 (Source: European Journal of Ophthalmology)
Source: European Journal of Ophthalmology - November 3, 2023 Category: Opthalmology Authors: Umberto Camellin Francesco Franchina Gianluigi Latino Ivan Ninotta Paola Palino Alessandro Meduri Pasquale Aragona Source Type: research
Comparison between IOL MASTER 500 and MYAH with vector analysis in low and mild anterior corneal astigmatism
CONCLUSIONS: The instruments appear to be interchangeable for measurements of AL, keratometry, and magnitude of ACA with high agreement between the two devices. Also, in the presence of low astigmatism, the two instruments give the same results in terms of ACA.PMID:37919941 | DOI:10.1177/11206721231210895 (Source: European Journal of Ophthalmology)
Source: European Journal of Ophthalmology - November 3, 2023 Category: Opthalmology Authors: Umberto Camellin Francesco Franchina Gianluigi Latino Ivan Ninotta Paola Palino Alessandro Meduri Pasquale Aragona Source Type: research
