Intrastromal corneal ring segment SK implantation for moderate to severe keratoconus

Sansanayudh, Wiwan; Bahar, Irit; Kumar, Naresh; Shehadeh-Mashour, Raneen; Ritenour, Rusty; Singal, Neera; Rootman, David S.

doi:10.1016/j.jcrs.2009.07.040

Cited by 60 publications

(77 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are in agreement with studies of Jadidi et al [30], Jabbarvand et al [33], Alio et al [29] and Sansanayudh et al [32]. The similar results in these studies can be related to similar 6 mm diameter and larger arc of rings.…”

Section: Discussionsupporting

confidence: 93%

“…Spherical and cylindrical refractive error decreased 1.4 diopter and 1.7 diopter respectively. These results are in line with other studies [8,[30][31][32][33][34][35][36][37][38]. UCVA improved three lines which is compatible with studies of Vega estrad et al [31] and Gharibieh et al [38].…”

Section: Discussionsupporting

confidence: 92%

“…Arcuate length variability results in better correction of astigmatism in keratoconus patients [22] To our knowledge, there are limited studies investigating Keraring 355 with high attention in KCN treatment. On the other hand, most studies measuring corneal aberration used topography [26][27][28][29][30][31][32][33]. In the present study, we investigated Keraring intrastromal segment effect on optical aberrations in KCN treatment using wave front analyzer which evaluates 80.000 points compared to topography evaluating 6.144 points [34].…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with Keratoconus

Jadidi¹,

Nejat²,

Alishiri³

et al. 2017

J Clin Exp Ophthalmol

View full text Add to dashboard Cite

Objective: To evaluate aberrometric changes in corneas with keratoconus implanted with intrastromal corneal ring segment (Keraring 355) during a 3-months follow-up. Design: Prospective, consecutive case seriesMethods: In this interventional study, 22 eyes of 21 keratoconic patients with mean age of 29 ± 6 years who underwent KeraRing 355 intrastromal corneal ring insertion using a Pocket Maker Microkeratome for channel creation and completed at least three months of follow-up were included. Uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA), refractive outcome, Orbscan finding and corneal aberrations were assessed.Results: Three months postoperately, Low order aberration (defocus and astigmatism) decreased significantly (P<0.001). No statistically significant changes were detected in total RMS, trefoil, secondary trefoil and coma. Moreover, a statistically significant increase in quatrefoil, secondary coma, spherical aberration and secondary spherical was found. In term of visual outcomes, the mean UCVA (in LogMAR value) improved significantly from 0.75 ± 0.33 to 0.31 ± 0.23 and the mean BSCVA improved (from 0.31 ± 0.16 to 0.19 ± 0.15) (P<0.05). The mean spherical refractive error improved (from -1.37 ± 1.36 to 0.01 ± 2.47) and the mean cylindrical refractive error decreased significantly (from -3.8 ± 1.03 to -2.1 ± 1.27 (P<0.001)). Also, the mean keratometry value decreased from 47.61 ± 2.03 to 42.50 ± 2.76. Conclusion: KeraRing 355 implantation provided significant improvement in low order aberrations but was not effective in high order aberrations (HOA) in low/moderate keratoconus patients. However, UCVA, BCVA, spherical and cylindrical refractive error and keratometry results improved significantly.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with Keratoconus

Jadidi¹,

Nejat²,

Alishiri³

et al. 2017

J Clin Exp Ophthalmol

View full text Add to dashboard Cite

show abstract

“…These results are consistent with those found in the literature, as most of the studies that have been carried out reported a gain of lines in UDVA. 6,7,10,21,27,28 We observed that the most significant increase in the UDVA was found in patients classified as grade plus, where more than 77% gained 1 or more lines of UDVA. Furthermore, in this group of patients we observed the least number of eyes losing 1 or more lines of UDVA (Tables 6 and 7).…”

Section: In This Study We Evaluated the Outcomes Of Icrsmentioning

confidence: 69%

“…[4][5][6]8,10,21,[25][26][27] In addition, studies that have analyzed the clinical outcomes according to the severity of the disease also reported a significant improvement in patients who suffered from a severe form of keratoconus. 5,21,27 By analyzing the results according to the degree of visual limitation, we found that more than 65% of our patients gain at least 1 line of UDVA after the primary implantation of the ICRS. These results are consistent with those found in the literature, as most of the studies that have been carried out reported a gain of lines in UDVA.…”

Section: In This Study We Evaluated the Outcomes Of Icrsmentioning

confidence: 99%

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Vega-Estrada

Alió

Brenner

et al. 2013

American Journal of Ophthalmology

115

View full text Add to dashboard Cite

PURPOSE: To analyze the outcomes of intracorneal ring segment (ICRS) implantation for the treatment of keratoconus based on preoperative visual impairment. DESIGN: Multicenter, retrospective, nonrandomized study.METHODS: A total of 611 eyes of 361 keratoconic patients were evaluated. Subjects were classified according to their preoperative corrected distance visual acuity (CDVA) into 5 different groups: grade I, CDVA of 0.90 or better; grade II, CDVA equal to or better than 0.60 and worse than 0.90; grade III, CDVA equal to or better than 0.40 and worse than 0.60; grade IV, CDVA equal to or better than 0.20 and worse than 0.40; and grade plus, CDVA worse than 0.20. Success and failure indices were defined based on visual, refractive, corneal topographic, and aberrometric data and evaluated in each group 6 months after ICRS implantation.RESULTS: Significant improvement after the procedure was observed regarding uncorrected distance visual acuity in all grades (P < .05). CDVA significantly decreased in grade I (P < .01) but significantly increased in all other grades (P < .05). A total of 37.9% of patients with preoperative CDVA 0.6 or better gained 1 or more lines of CDVA, whereas 82.8% of patients with preoperative CDVA 0.4 or worse gained 1 or more lines of CDVA (P < .01). Spherical equivalent and keratometry readings showed a significant reduction in all grades (P £ .02). Corneal higher-order aberrations did not change after the procedure (P ‡ .05).CONCLUSIONS: Based on preoperative visual impairment, ICRS implantation provides significantly better results in patients with a severe form of the disease. K ERATOCONUS IS AN ECTATIC DEBILITATING corneal disorder characterized by a progressive corneal thinning that results in corneal protrusion, irregular astigmatism, and decreased vision. 1 A variety of options have been described for the management of this pathologic condition, such as rigid gas-permeable contact lenses, 2 corneal collagen cross-linking, 3 intracorneal ring segment implantation, 4-11 or keratoplasty. 12 In a number of studies intracorneal ring segments (ICRS) have been demonstrated to be effective in improving visual acuity and reducing the refractive error and the mean keratometry in selected cases of keratoconic eyes. 4-11 Such a positive therapeutic effect is considered to be based on the induction of a remodeling of the corneal anterior and posterior surface's topography, which improves the optical quality of the cornea and reduces the optical aberrations, with consequent improvement in best-corrected visual acuity. [4][5][6][7][8][9][10][11] Although in the healthy cornea, the sectorial arcuate addition to the corneal local volume caused by these implants at the corneal midperiphery induces a flattening of the central cornea in an arc-shortening effect, with the consequence of a decrease in myopic spherical equivalent attributable to the overall reduction in the optical power of the cornea, 13 such corneal modeling effect may be different in structurally abnormal corneas such as in keratoco...

show abstract

Refractive Crosslinking: ACXL Plus

Mazzotta

Raiskup²,

Baiocchi

et al. 2017

Management of Early Progressive Corneal Ectasia

View full text Add to dashboard Cite

Intrastromal corneal ring segment SK implantation for moderate to severe keratoconus

Abstract: No author has a financial or proprietary interest in any material or method mentioned.

Cited by 60 publications

References 15 publications

Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with Keratoconus

Aberrometric Outcomes of Intrastromal Corneal Ring Segment (KeraRing 355) Implantation Using PocketMaker Microkeratome in Patients with Keratoconus

Outcome Analysis of Intracorneal Ring Segments for the Treatment of Keratoconus Based on Visual, Refractive, and Aberrometric Impairment

Refractive Crosslinking: ACXL Plus

Contact Info

Product

Resources

About