Short-term clinic observation of misalignment and rotational stability after implantable collamer lens implantation

Wei, Pinghui; Li, Jun; Jiao, Xiao-ling; Yu, Zhe; Song, Hui

doi:10.1007/s00417-022-05929-7

Cited by 7 publications

(1 citation statement)

References 40 publications

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“…However, T-IOL implantation has shown high rotational stability. 24,25 Hyun et al found misalignment values around 3 to 4 degrees, whereas other authors, with results similar to ours (AoE = 0.26 degrees), found mean values around 2 degrees. 19,26,27 In addition, these small misalignments, which are more sensitive in high astigmatism, are better tolerated in low astigmatism.…”

Section: Discussionsupporting

confidence: 82%

Management of low astigmatism in implantable collamer lens surgery: opposite clear corneal incisions vs toric implantable collamer lens

González-Cruces,

Sánchez-Ventosa,

Villarrubia

et al. 2023

J Cataract Refract Surg

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Purpose: To compare two techniques to correct low astigmatism during implantable collamer lens (ICL) surgery: astigmatic opposite clear corneal incisions (OCCIs) and toric ICL (T-ICL). Setting: Arruzafa Ophthalmological Hospital, Cordoba, Spain. Design: Randomized prospective comparative study. Methods: The study comprised 152 myopic eyes undergoing ICL (STAAR Surgical) surgery. Patients were separated into two groups: group 1 (57 patients; 76 eyes) received a spherical ICL with OCCIs and group 2 (53 patients; 76 eyes) received a T-ICL. The inclusion criteria were refractive astigmatism up to 1.50 diopters (D), regular corneal astigmatism up to 2.00 D (Sim K, Pentacam), and agreement between the refractive and topographic corneal cylinders (discrepancies less than 30º axis or 0.50 D). The outcomes were evaluated after a one-month follow-up. Results: The T-ICL group achieved a mean postoperative spherical equivalent refraction and refractive astigmatism of -0.04 ± 0.17 D and -0.03 ± 0.12 D, respectively, versus -0.14 ± 0.33 D and -0.20 ± 0.36 D, in the OCCI group (P<0.001). Postoperative refractive astigmatism of less than 0.25 D was achieved in 94.74% of cases in the T-ICL group versus 73.68% in the OCCI group. Undercorrection of corneal astigmatism occurred in the OCCI group with a surgically induced astigmatism of 0.48 ± 0.24 D and correction index=0.46. Conclusions: Both the T-ICL and OCCI techniques provided excellent results in terms of safety and efficacy. T-ICL surgery was shown to be more predictable and accurate for correcting low astigmatism with a lower postoperative spherical equivalent and less residual astigmatism compared to incisional management.

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Section: Discussionsupporting

confidence: 82%

Management of low astigmatism in implantable collamer lens surgery: opposite clear corneal incisions vs toric implantable collamer lens

González-Cruces,

Sánchez-Ventosa,

Villarrubia

et al. 2023

J Cataract Refract Surg

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Experimental Study of In-Body Devices Misalignment Impact on Light-Based In-Body Communications

Fuada,

Särestöniemi,

Katz

et al. 2024

Communications in Computer and Information Science

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Optical wireless communication (OWC) has emerged as a promising technology for implantable medical devices because it provides private and secure wireless links for patients, low-power consumption, and high-speed data transmission. The OWC system’s receiving end typically relies on a photodetector with a limited field-of-view, necessitating direct line-of-sight connections for effective transmission. The directional nature of light-tissue interaction on the in-body communication can be problematic as the quality of the optical signal is rapidly deteriorated due to the properties of biological tissues, including scattering, absorption, and reflection, leading to a substantial loss of optical beam power reaching the photodetector’s sensitive area. In this sense, any misalignment that occurs in the in-body device can directly impact the power level and further degrade the received signal quality. Numerous studies have been conducted on this topic in free-space environments; nevertheless, only a few results have been found for in-body cases. In this work, we experimentally demonstrate the impact of the in-body device misalignment on the OWC-based in-body communication system. Three cases were investigated: aligned systems, as well as lateral and angular misalignments. We considered an 810 nm Near-infrared (NIR) LED as a transmitter because the optical signal of the mentioned wavelength propagates better than other wavelengths through biological tissues. For the experiments, we used pure muscle and fat tissues with 15 mm thickness at different temperatures (23 ℃ and 37 ℃). We also tested with thicker meat samples (30 mm, 38 mm, and 40 mm, consisting of muscle + fat layers) at 37 ℃. This study adhered to ANSI.Z136.1–2007 safety standards. First, the results reveal that optical power still reaches the receiver in an aligned reference case at a meat thickness of 40 mm. Second, the in-body device misalignment significantly degrades the optical power density received, which is more pronounced under lateral than angular conditions. These misalignment effects must be carefully considered for further system enhancement when using OWC for the in-body communication system.

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EVO/EVO+ Visian Implantable Collamer Lenses for the correction of myopia and myopia with astigmatism

Martínez-Plaza

Rosa

López-Miguel

et al. 2023

Expert Review of Medical Devices

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Short-term clinic observation of misalignment and rotational stability after implantable collamer lens implantation

Cited by 7 publications

References 40 publications

Management of low astigmatism in implantable collamer lens surgery: opposite clear corneal incisions vs toric implantable collamer lens

Management of low astigmatism in implantable collamer lens surgery: opposite clear corneal incisions vs toric implantable collamer lens

Experimental Study of In-Body Devices Misalignment Impact on Light-Based In-Body Communications

EVO/EVO+ Visian Implantable Collamer Lenses for the correction of myopia and myopia with astigmatism

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