Intracorneal ring segment depth in keratoconus patients: a long-term follow-up study

Shahhoseini, Saied; Hashemi, Hassan; Asgari, Soheila

doi:10.1007/s10792-017-0595-2

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…36 However, longer follow-ups are needed to provide consistent conclusions about the positional stability of ring segments within the corneal structure. Indeed, Shahhoseini et al 20 demonstrated in a retrospective study that ring segments were placed at a shallower depth than originally intended at 26 months after their implantation. More studies concerning this issue are still needed to obtain consistent conclusions.…”

Section: Discussionmentioning

confidence: 99%

“…19 However, the depth of implantation of the ring segment is not considered in nomograms of ICRS implantation in spite of being the parameter that affects the corneal optics the most according to simulations used in silico models. 8 Currently, the use of the femtosecond laser technology allows the creation of tunnels for ICRS insertion at a predictable depth, 20 although long-term changes in this depth can occur possibly due to biomechanical or structural modifications and the scrubbing habit of these patients that can modify the position of the rings. 21,22 The aim of the current study was to analyze and characterize the impact of the depth of implantation of ICRS on morphological, biomechanical, and clinical outcomes obtained in ectatic corneas.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the variability in implantation depth of intracorneal ring segments using the femtosecond laser technology in corneal ectasia

Peris-Martínez

Dualde-Beltrán

Fernández-López

et al. 2019

European Journal of Ophthalmology

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Purpose: To analyze the impact of the depth of implantation of intracorneal ring segments on morphological, biomechanical, and clinical outcomes in ectatic corneas. Methods: This prospective longitudinal study enrolled 40 eyes of 29 patients (age 20–51 years) with corneal ectasia that underwent intracorneal ring segments implantation (KeraRing, Mediphacos). Changes in visual acuity, refraction, corneal tomography, and corneal biomechanics (Ocular Response Analyzer, Reichert) were evaluated during a 6 month follow-up. Likewise, changes in ring segment implantation depth measured by optical coherence tomography (Visante OCT, Carl Zeiss Meditec) were also evaluated. Results: Mean relative depth of implantation was 71.6 ± 5.8%, 71.5 ± 6.5%, and 71.9 ± 6.3% at 1, 3, and 6 months after surgery, respectively (p = 0.827). The difference between the real relative depth of implantation and the theoretical attempted value of 70% was not statistically significant (p = 0.072). Differences in spherical equivalent during the follow-up changed significantly depending on the level of relative depth of implantation (p = 0.036), with an increase of 0.114 D per each 1% increase in relative depth of implantation. Likewise, a decrease of –0.194 D in the steepest keratometric reading was found per each decrease of 1% in relative depth of implantation (p = 0.026). Changes in corneal thickness (p = 0.092) and biomechanics (p = 0.080) were not related to relative depth of implantation. Conclusion: The effect on visual acuity and refraction of intracorneal ring segments when implanted in corneal ectasia is less clinically relevant when the implantation is done at a very deep plane. The variability of the depth of intracorneal ring segments implantation when using femtosecond laser technology is minimal and with no clinically significant effect on clinical outcomes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the variability in implantation depth of intracorneal ring segments using the femtosecond laser technology in corneal ectasia

Peris-Martínez

Dualde-Beltrán

Fernández-López

et al. 2019

European Journal of Ophthalmology

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“…In eyes treated with traditional Dresden protocol, the depth of the demarcation line is approximately 300 µm [35] and shallower in accelerated CXL. AS-OCT also helpful in the evaluating the depth of implantation of intrastromal ring segments [36,37].…”

Section: Keratoconusmentioning

confidence: 99%

Role of AS-OCT in Managing Corneal Disorders

et al. 2022

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Optical coherence tomography (OCT) is analogous to ultrasound biometry in the cross sectional imaging of ocular tissues. Development of current devices with deeper penetration and higher resolution has made it popular tool in clinics for visualization of anterior segment structures. In this review, the authors discussed the application of AS-OCT for diagnosis and management of various corneal and ocular surface disorders. Further, recent developments in the application of the device for pediatric corneal disorders and extending the application of OCT angiography for anterior segment are introduced.

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“…[ 15 ] In keratoconus patients, AS-OCT is found useful for qualitative evaluation of the cornea before and after implantation of the intrastromal ring. [ 18 ] AS-OCT is found useful to evaluate the Descemet's membrane tear, dimensions of intrastromal clefts, and corneal thickness in acute corneal hydrops of keratoconus [ Fig. 1 ].…”

Section: Keratoconus Diagnosis and Treatmentmentioning

confidence: 99%

Anterior segment optical coherence tomography for evaluation of cornea and ocular surface

Sridhar

Martín

2018

Indian J Ophthalmol

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Intracorneal ring segment depth in keratoconus patients: a long-term follow-up study

Abstract: The mean 26 months after implantation, ring segments are placed at a shallower depth than originally intended. Therefore, although femtosecond laser technology is an acceptable method for the surgeon, it is necessary to revisit the depth calculator of the device.

Cited by 5 publications

References 17 publications

Effect of the variability in implantation depth of intracorneal ring segments using the femtosecond laser technology in corneal ectasia

Effect of the variability in implantation depth of intracorneal ring segments using the femtosecond laser technology in corneal ectasia

Role of AS-OCT in Managing Corneal Disorders

Anterior segment optical coherence tomography for evaluation of cornea and ocular surface

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