Intrastromal corneal ring segments for treating keratoconus

Zadnik, Karla; Money, Sarah; Lindsley, Kristina

doi:10.1002/14651858.cd011150.pub2

Cited by 14 publications

(10 citation statements)

References 26 publications

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“…There are several nomograms for the selection of the segment to be implanted, based on subjective preoperative refraction, keratometry, topography, and cone location data, and good visual and refractive results of lines gained without correction have been reported after implantation 1 . However, postoperative refractive surprises are not uncommon in terms of visual gain, so there is no established predictability [9][10][11][12][13] . The groups studied were homogeneous in terms of age and sex.…”

Section: Discussionmentioning

confidence: 99%

Factors associated with short-term visual improvement after intracorneal ring segments implantation

Soto-Masías¹,

Galvez-Olortegui²,

Galvez-Olortegui³

et al. 2020

RMOE

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Objective: To evaluate the correlation between preoperative factors and short-term postoperative visual improvement in patients with keratoconus treated with intracorneal ring segments implantation.Additionally, to determine surgical complications. Methods: Analytical, observational case-control study. One-hundred and ten eyes of 91 patients were included. The preoperative factors evaluated included age,sex,visual acuity,refractive error,surgical technique (mechanical or femtosecond-assisted), pachymetry and keratoconus grade by keratometry. Two groups were obtained according to the gain of lines of uncorrected visual acuity after intrastromal segment implantation surgery, with a gain of 3 or more lines (cases), and a gain of 3 or less lines (controls). Results: Only preoperative myopic astigmatism had a statistically significant higher frequency in cases than in controls (p < 0.05). Although there was a greater number of eyes with an average keratometry between 48 52 D (Keratoconus stage II) in the cases group, this was not statistically significant. There was no correlation between the preoperative technique used and the postoperative visual result.The percentage of surgical complications was of 1.81%. Conclusion:The only factor with a statistically significant correlation with uncorrected visual acuity was the previous refractive error. The incidence of postoperative complications was low.

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Section: Discussionmentioning

confidence: 99%

Factors associated with short-term visual improvement after intracorneal ring segments implantation

Soto-Masías¹,

Galvez-Olortegui²,

Galvez-Olortegui³

et al. 2020

RMOE

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“…Existen varios nomogramas para la selección del segmento a implantar, basados en la refracción subjetiva preoperatoria, queratometría, topografía y datos de localización del cono, y se han reportado buenos resultados visuales y refractivos de ganancia de líneas de visión no corregida luego del implante 1 . Sin embargo, las sorpresas refractivas postoperatorias no son raras en términos de ganancia visual, por lo que no hay una predictibilidad establecida [9][10][11][12][13] .…”

Section: Discussionunclassified

Factores asociados a mejoría visual a corto plazo tras implantación de segmentos intraestromales en pacientes con queratocono

Soto-Masías¹,

Galvez-Olortegui²,

Galvez-Olortegui³

et al. 2020

Revista Mexicana De Oftalmología

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Determinar la asociación entre factores preoperatorios y la mejoría visual a corto plazo después del implante de segmentos intraestromales en pacientes con queratocono, así como conocer sus complicaciones operatorias. Método: Estudio observacional, analítico de casos y controles. Se incluyeron 110 ojos de 91 pacientes. Los factores preoperatorios estudiados fueron edad, sexo, agudeza visual preoperatoria, refracción, técnica quirúrgica empleada (mecánica o asistida por femtosegundo), paquimetría y grado de queratocono según queratometría. Se formaron dos grupos según la ganancia de líneas de visión sin correctores después de la cirugía de implante de segmentos intraestromales, con ganancia mayor o igual a tres líneas (casos) y ganancia menor a tres líneas (controles). Resultados: De las variables estudiadas, solo el estado refractivo previo de astigmatismo miópico tuvo una frecuencia mayor estadísticamente significativa (p < 0,05) en el grupo de casos que en el de controles. Aunque en el grupo de casos se encontró mayor número de ojos con queratometrías medias entre 48 y 52 D (grado II de queratocono), este valor no resultó estadísticamente significativo. No hubo asociación entre la técnica operatoria utilizada y el resultado visual postoperatorio. El porcentaje de complicaciones operatorias fue del 1.81%. Conclusiones: El estado refractivo previo fue el único factor estudiado con una asociación estadísticamente significativa con la agudeza visual sin correctores postoperatoria. La presencia de complicaciones postoperatorias fue baja.

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“…Patients with progressive keratoconus should be evaluated for treatment with collagen crosslinking (CCL) or intrastromal corneal ring segment (ICRS) placement prior to cataract surgery to biomechanically strengthen and flatten the cornea, respectively [12,13]. In patients with severe disease, concurrent CCL and ICRS are safe and effective [14].…”

Section: Preoperative Considerationsmentioning

confidence: 99%

Cataract surgery considerations in patients with prior history of keratoconus and ectasia

Moshirfar

Ziari

Ronquillo

2022

Current Opinion in Ophthalmology

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Purpose of reviewPreoperative workup for cataract surgery in patients with keratoconus poses certain challenges, particularly in patients with moderate-to-severe disease. This review aims to outline the appropriate preoperative, intraoperative, and postoperative considerations and provides an algorithm to help guide the workup prior to surgery.Recent findingsA new system for keratoconus progression and staging has been proposed and additional studies comparing intraocular lens (IOL) formulas calculations and biometry devices have been conducted.SummaryPatients with severe keratoconus have unpredictable results and have an increased risk of a hyperopic refraction postoperatively. Although studies have compared IOL calculation formulas, there is no consensus on management. Clinical considerations and an approach to the workup are presented; however, additional studies are required to determine the most appropriate management of cataracts in severe keratoconus.

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Intrastromal corneal ring segments for treating keratoconus

Cited by 14 publications

References 26 publications

Factors associated with short-term visual improvement after intracorneal ring segments implantation

Factors associated with short-term visual improvement after intracorneal ring segments implantation

Factores asociados a mejoría visual a corto plazo tras implantación de segmentos intraestromales en pacientes con queratocono

Cataract surgery considerations in patients with prior history of keratoconus and ectasia

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