March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Intracorneal Rings For Keratectasia: Is There A Real Difference Between Them?
Author Affiliations & Notes
  • Margarita Montano
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Vicente Correa-Gomez
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Alejandro Navas
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Arturo J. Ramirez-Miranda
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Alberto Haber
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Ricardo Vargas
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Tito Ramírez- Luquín
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Enrique O. Graue
    Cornea & Refractive Surgery, Instituto de Oftalmologi­a, Fundacion Conde de Valenciana, Mexico City, Mexico
  • Footnotes
    Commercial Relationships  Margarita Montano, None; Vicente Correa-Gomez, None; Alejandro Navas, None; Arturo J. Ramirez-Miranda, None; Alberto Haber, None; Ricardo Vargas, None; Tito Ramírez- Luquín, None; Enrique O. Graue, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 4052. doi:
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      Margarita Montano, Vicente Correa-Gomez, Alejandro Navas, Arturo J. Ramirez-Miranda, Alberto Haber, Ricardo Vargas, Tito Ramírez- Luquín, Enrique O. Graue; Intracorneal Rings For Keratectasia: Is There A Real Difference Between Them?. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4052.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose:
 

To analyze the effect of age, intracorneal ring type and keratoconus degree on the outcomes of intracorneal ring implantation in patients with corneal ectasia.

 
Methods:
 

Patients with clinical and topographic (Oculus Pentacam) diagnosis of keratoconus or post-LASIK ectasia treated with intrastromal ring segments from 2007 to September 2011. Keratometric values , sphere, cylinder, spherical equivalent, uncorrected and best corrected visual acuity preop and postoperatively were recorded. Non parametric variables were analyzed with Wilcoxon rank test and a linear regression analysis was performed to evaluate the effect of age, ring type and kerataconus degree using STATA v. 10

 
Results:
 

71 consecutive eyes of 49 patients. Keratoconus as graded with Amsler-Krumeich classification were distributed as follow : type 1 39.4 % ( n= 26 ), type 2 45.5 % (n=30), type 3 12.1% (n=8) and type 4 3% (n=2). Before surgery mean uncorrected visual acuity was logMAR 1.3 0 ± 0.46, mean best spectacle corrected visual acuity was logMAR 0.36± 0.2 and mean astigmatism of 5.02± 2.24 D. Postoperatively uncorrected visual acuity was logMAR 0.62 ± 0.3, best spectacle corrected visual acuity was logMAR 0.29 ± 0.17 and astigmatism 4.32 ± 1.7D. These differences were all statistically significant with p=0.001, p=0.009 and p=0.013, respectively. Multiple linear regression analysis revealed that when adjusting for age, ring segment type and keratoconus degree only the later contributed significantly to the outcome p=0.028

 
Conclusions:
 

When implanting intracorneal ring segments to improve vision in keratectasia , the most influential and important variable to consider is the keratoconus degree at the time of surgery rather than the type of device being used.

 
Keywords: refractive surgery • keratoconus 
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