Changes in Corneal Biomechanical Properties After Small-Incision Lenticule Extraction and Photorefractive Keratectomy, Using a Noncontact Tonometer

Zarei‐Ghanavati, Siamak; Jafarpour, Soheyla; Hassanzadeh, Samira; Bakhtiari, Elham; Daraee, Ghazaleh; Monadi, Sahar Darabi; Ziaei, Mohammed

doi:10.1097/ico.0000000000002888

Cited by 3 publications

(3 citation statements)

References 40 publications

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“…There is still controversy regarding whether different corneal ap thicknesses affect the Corvis ST Biomechanical Index (CBI). Different corneal ap thicknesses may lead to differences in corneal CBI and stiffness parameters at rst applanation 37 . Fang et al found no in uence of different ap thicknesses on CBI after SMILE, while another study showed signi cant differences in CBI and stiffness parameters at rst applanation between 110 µm cap and 145 µm cap 38 .…”

Section: Discussionmentioning

confidence: 99%

Comparison of the accuracy of 9 intraocular lens power calculation formulas after SMILE in Chinese myopic eyes

Li,

Yuan,

Yang

et al. 2023

Preprint

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As of 2021, over 2.8 million cases of small incision lenticule extraction (SMILE) procedures had been performed in China. However, there remains limited knowledge regarding the selection of intraocular lens (IOL) power calculation formulas for post-SMILE cataract patients. This study included 52 eyes of 26 myopic patients from northern China who underwent SMILE at Tianjin Eye Hospital from September 2022 to February 2023 and was designed to investigate the performance of multiple IOL calculation formulas in post-SMILE patients using a theoretical surgical model. We compared the postoperative results obtained from three artificial intelligence (AI)-based formulas and six conventional formulas provided by the American Society of Cataract and Refractive Surgery (ASCRS). These formulas were applied to calculate IOL power using both total keratometry (TK) and keratometry (K) values, and the results were compared to the preoperative results obtained from the Barrett Universal II (BUII) formula in SMILE cases. Among the evaluated formulas, the results obtained from Emmetropia Verifying Optical 2.0 Formula with TK (EVO-TK) (0.40 ± 0.29 D, range 0 to 1.23 D), Barrett True K with K (BTK-K, 0.41 ± 0.26 D, range 0.01 to 1.19 D), and Masket with K (Masket-K, 0.44 ± 0.33 D, range 0.02 to 1.39 D) demonstrated the closest proximity to BUII. Notably, the highest proportion of prediction errors within 0.5 D was observed with BTK-K (71.15%), EVO-TK (69.23%), and Masket-K (67.31%), with BTK-K showing a significantly higher proportion compared to Masket-K (p < 0.001). Our research indicates that in post-SMILE patients, EVO-TK, BTK-K, and Masket-K may yield more accurate calculation results. At the current stage, AI-based formulas do not demonstrate significant advantages over conventional formulas. However, the application of historical data can enhance the performance of these formulas.

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Section: Discussionmentioning

confidence: 99%

Comparison of the accuracy of 9 intraocular lens power calculation formulas after SMILE in Chinese myopic eyes

Li,

Yuan,

Yang

et al. 2023

Preprint

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“…Zarei-Ghanavati et al 43 estudiaron 74 pacientes, 37 sometidos a SMILE y 37 a PRK, y concluyeron que ambos procedimientos alteran significativamente las propiedades biomecánicas de la córnea; sin embargo, los cambios eran más prominentes después de SMILE.…”

Section: Corvis St En Cirugía Ocularunclassified

Importancia y uso de la biomecánica corneal y su utilidad diagnóstica

Ramirez-Miranda,

Mangwani-Mordani,

Arteaga-Rivera

et al. 2023

CIRU

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El estudio de la biomecánica corneal ha cobrado relevancia en los últimos años debido a sus posibles aplicaciones en el diagnóstico, el manejo y el tratamiento de diversas enfermedades, como glaucoma, cirugía queratorrefractiva y diferentes enfermedades corneales. La investigación de la biomecánica corneal es de mucha importancia en el contexto de cirugía refractiva, pues podría identificar pacientes en riesgo de desarrollar una ectasia corneal iatrogénica. Esta revisión se centra en dos de las tecnologías disponibles para uso clínico: el Ocular Response Analyzer (Reichert Ophthalmic Instruments, Buffalo, NY, EE. UU.) y el Corvis ST (Oculus Optikgergäte GmbH, Wetzlar, Alemania). Ambos son tonómetros de no contacto que proporcionan una evaluación clínica de la biomecánica corneal. Se describen los fundamentos y los principales parámetros de cada dispositivo, así como su uso en cirugía ocular y el comportamiento biomecánico corneal en las enfermedades oculares. Finalmente, se mencionan los dispositivos más recientes de análisis biomecánico, como la microscopía de Brillouin, así como la integración de los datos biomecánicos y topográficos basados en Scheimpflug con la inteligencia artificial para aumentar la precisión en la detección del riesgo de ectasias.

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“…[2][3][4][5][6] Although the ability of the corneal flap to preserve the biomechanical strength of the cornea is substantially weakened after laser-assisted in situ keratomileusis (LASIK), the corneal cap has previously been shown to continue to play a role in maintaining the corneal biomechanics after SMILE. 7 It has been hypothesized that a thicker cap will result in the extraction of a deeper lenticule in the corneal tissue, maintaining more of the anterior portion of the cornea, which is biomechanically stronger than the posterior lamella and therefore offer biomechanical advantages. 2,8 Limited clinical studies have evaluated the outcomes of SMILE with different cap thicknesses (brief mention of results).…”

mentioning

confidence: 99%

Comparison of 110- and 145-µm Small-Incision Lenticule Extraction Cap Thickness: A Randomized Contralateral Eye Study

Zarei‐Ghanavati

Jafarzadeh

Es’haghi

et al. 2023

Cornea

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Purpose: To investigate the visual, refractive, and biomechanical outcomes of small incision lenticule extraction (SMILE) with two different cap thicknesses.Methods: Thirty-four patients were included in this prospective, randomized, contralateral eye study. Subjects were randomized to receive SMILE surgery with a 110-m cap thickness in one eye and 145-mm cap thickness in the fellow eye. Uncorrected and corrected distance visual acuity, contrast sensitivity (CS), total higherorder aberrations (THOAs) and corneal biomechanical properties were compared 3 months after surgery. Results: Postoperative refractive and visual outcomes, CS andTHOAs were similar between the two groups (P . 0.05 for all parameters). At 3 months postoperatively, there was a significant difference in Corvis ST Biomechanical Index (CBI); stiffness parameter at first applanation (SP A1), and Integrated Radius between the two groups (all P , 0.05). Conclusions:Eyes with thicker SMILE corneal caps showed no advantage regarding visual acuity, CS and THOAs over eyes with thinner caps. However, higher cap thickness may result in better corneal biomechanical properties postoperatively.

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Changes in Corneal Biomechanical Properties After Small-Incision Lenticule Extraction and Photorefractive Keratectomy, Using a Noncontact Tonometer

Cited by 3 publications

References 40 publications

Comparison of the accuracy of 9 intraocular lens power calculation formulas after SMILE in Chinese myopic eyes

Comparison of the accuracy of 9 intraocular lens power calculation formulas after SMILE in Chinese myopic eyes

Importancia y uso de la biomecánica corneal y su utilidad diagnóstica

Comparison of 110- and 145-µm Small-Incision Lenticule Extraction Cap Thickness: A Randomized Contralateral Eye Study

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