Clinical Outcomes of an Asymmetric Model of Intrastromal Corneal Ring Segments for the Correction of Keratoconus

Cornea ◽  
2020 ◽  
Vol 39 (2) ◽  
pp. 155-160 ◽  
Author(s):  
Olivier Prisant ◽  
Elodie Pottier ◽  
Tony Guedj ◽  
Thanh Hoang Xuan
Keyword(s):  
Clinical Outcomes ◽  
Asymmetric Model ◽  
Intrastromal Corneal Ring

Clinical Outcomes of a New Type of Continuous Intrastromal Corneal Ring for Treatment of Keratoconus

Cornea ◽  
2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Mahmoud Jabbarvand ◽  
Hooman Ahmadzadeh ◽  
Mehdi Khodaparast ◽  
Alireza Jamali ◽  
Mohamadreza Aghamirsalim
Keyword(s):  
Clinical Outcomes ◽  
Intrastromal Corneal Ring ◽  
New Type

scholarly journals The Influence of Corneal Volume in Surgical Planning: Insights for a New Parameter for the Ferrara Ring Nomogram

2013 ◽  
Vol 2 (1) ◽  
pp. 12-15
Author(s):  
Leonardo Torquetti ◽  
Wagner Gomes Dias
Keyword(s):  
Standard Deviation ◽  
Clinical Outcomes ◽  
Surgical Planning ◽  
Corneal Thickness ◽  
Intrastromal Corneal Ring ◽  
Corneal Volume ◽  
Before And After ◽  
Corneal Asphericity ◽  
The Mean

ABSTRACT Purpose To evaluate the corneal volume (CV) before and after Ferrara intrastromal corneal ring segments (ICRS) implantation and its influence in clinical outcomes in keratoconus patients. Materials and methods A total of 77 eyes of 42 keratoconus patients consecutively implanted with the Ferrara ICRS were evaluated with a Pentacam (Oculus Optikgerate GmbH). The following parameters were obtained: Anterior corneal asphericity (Q), CV and thinnest corneal thickness (TCT). The inter-relation between Q and CV was evaluated. Results In patients with CV inside two standard deviation (SD: 53.51-60.65) of the mean CV, the postoperative asphericity values roughly agreed with expected asphericity values. In patients with CV outside two SD intervals (<53.51 and >60.65) of the mean CV, the postoperative asphericity values did not agreed with expected asphericity values. Corneas with high volumes (>60.65) had less change of asphericity than corneas with low volumes. Conclusion The CV is a new parameter, to be better studied, as it seems to be important in ICRS selection. Corneas with high volumes may require more tissue to get flattened and properly reshaped. How to cite this article Torquetti L, Ferrara G, Dias WG, Ferrara P. The Influence of Corneal Volume in Surgical Planning: Insights for a New Parameter for the Ferrara Ring Nomogram. Int J Kerat Ect Cor Dis 2013;2(1):12-15.

Efficacy of progressive thickness intrastromal corneal ring segments in the treatment of duck phenotype keratoconus

2021 ◽  
pp. 112067212110017
Author(s):  
Juan G Arbelaez ◽  
Maria C Arbelaez
Keyword(s):  
Visual Acuity ◽  
Clinical Outcomes ◽  
Effective Means ◽  
Study Cohort ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Intrastromal Corneal Ring ◽  
Manifest Refraction ◽  
Corrected Distance Visual Acuity ◽  
Belo Horizonte

Purpose:To evaluate clinical outcomes in patients with asymmetric duck phenotype keratoconus implanted with asymmetric progressive thickness intrastromal corneal ring segments (PT-ICRS, Keraring AS, Mediphacos, Belo Horizonte, Brazil), and to demonstrate improved visual acuity and symmetry in corneal flattening.Methods:This single-center, retrospective, observational study evaluated the clinical outcomes at 1, 3, and 6 months after implantation of PT-ICRS in patients with duck phenotype keratoconus. After creating the intrastromal tunnel with a femtosecond laser, one 160-degree arc length PT-ICRS, either 150/250 µm or 200/300 µm, was implanted. Changes in uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction (MR), manifest refraction spherical equivalent (MRSE), mean keratometry (Kmean), maximum keratometry (Kmax), Coma@5mm, and manifest and topographical astigmatism were documented.Results:The study cohort included 23 eyes of 17 patients with a mean age of 24.6 years. From baseline to 6 months following implantation, mean UDVA improved from 0.70 logarithm of the minimum angle of resolution (logMAR) (20/100 Snellen) to 0.22 logMAR (20/33 Snellen), CDVA improved from 0.33 logMAR (20/42 Snellen) to 0.14 logMAR (20/27 Snellen), the mean sphere and MRSE decreased from −1.05 diopters (D) and −2.70 D to −0.25 D and −0.80 D, respectively, and the Kmean and Kmax improved from 46.5 D and 53.7 D to 44.6 D and 48.7 D, respectively.Conclusions:The Keraring AS ICRS offers a safe, effective means of improving visual acuity while reducing refractive error, mean and max keratometry, and aberrations in patients with duck phenotype keratoconus.

Clinical Outcomes After Implantation of 320°-Arc Length Intrastromal Corneal Ring Segments in Keratoconus

Cornea ◽  
2018 ◽  
Vol 37 (10) ◽  
pp. 1299-1305 ◽  
Author(s):  
Leonardo Torquetti ◽  
Priscila Cunha ◽  
Allan Luz ◽  
Sérgio Kwitko ◽  
Márcio Carrion ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Arc Length ◽  
Intrastromal Corneal Ring

scholarly journals Predictors of Clinical Outcomes after Intrastromal Corneal Ring Segments Implantation

2012 ◽  
Vol 1 (1) ◽  
pp. 26-30 ◽  
Author(s):  
Leonardo Torquetti
Keyword(s):  
Visual Acuity ◽  
Clinical Outcomes ◽  
Stage I ◽  
Outcome Analysis ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Independent Analysis ◽  
Intrastromal Corneal Ring ◽  
Corrected Distance Visual Acuity ◽  
Corneal Volume

ABSTRACT Purpose To evaluate the influence of age and severity of keratoconus in the clinical outcomes of implantation of Ferrara intrastromal corneal ring segments (ICRS). Methods A total of 1,073 eyes of 810 patients, consecutively operated from January 2006 to July 2008, were evaluated. Two independent analysis were made according to the age of patients and keratoconus staging. Four groups were created according to the age of patients: < 20 years old, 20 to 30, 30 to 40 and >40 years old. The patients were also evaluated according to the keratoconus stage (I to IV). The outcome analysis included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), keratometry (K), asphericity (Q), corneal volume (CV) and pachymetry. All patients were evaluated using the Pentacam. Results The postoperative increase in UDVA and CDVA was statistically significant in all groups (p < 0.05). The magnitude of improvement of CDVA was larger for patients between 21 and 30-year-old (CDVA = 20/40) and patients with keratoconus grade I (CDVA = 20/35) (p < 0.05). There was a statistically significant increase in CV and pachymetry postoperatively in all groups. The keratometry (3.95D) and asphericity (–0.77) reduction were larger in patients younger than 20-year-old and in patients with keratoconus grade IV (p < 0.05). Conclusion The best clinical outcomes are seen in patients between 20 and 30-year-old and initial cases of keratoconus (grade I). The more advanced the keratoconus, the larger magnitude of K and Q reduction after ICRS implantation. How to cite this article Torquetti L, Ferrara G, Ferrara P. Predictors of Clinical Outcomes after Intrastromal Corneal Ring Segments Implantation. Int J Keratoco Ectatic Corneal Dis 2012;1(1):26-30.

Selecting Skills To Teach Communication Partners: Where Do I Start?

2012 ◽  
Vol 21 (4) ◽  
pp. 127-135 ◽  
Author(s):  
Cathy Binger ◽  
Jennifer Kent-Walsh
Keyword(s):  
Clinical Outcomes ◽  
Intervention Program ◽  
Communication Partners ◽  
Multiple Challenges

Abstract Clinicians and researchers long have recognized that teaching communication partners how to provide AAC supports is essential to AAC success. One way to improve clinical outcomes is to select appropriate skills to teach communication partners. Although this sometimes seems like it should be a straightforward component of any intervention program, deciding which skills to teach partners can present multiple challenges. In this article, we will troubleshoot common issues and discuss how to select skills systematically, resulting in the desired effects for both communication partners and clients.

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