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Development of a dynamic nomogram for the treatment of keratoconus with intracorneal ring segment implantation

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Session Details

Session Title: Cornea: Surgical II

Session Date/Time: Sunday 08/10/2017 | 14:30-16:00

Paper Time: 14:54

Venue: Room 3.6

First Author: : C.Gordillo ARGENTINA

Co Author(s): :    J. Grandin   A. Lotfi                 

Abstract Details


To describe the development of a new nomogram for the treatment of keratoconus that allows the calculation of the surgical plan for the implantation of intracorneal rings (ICRs) adjusted to the individual characteristics of each patient knowing the values and percentages of improvement solved with Knowledge of its evolution over time.


All the procedures were performed at Cornea Department of Zaldivar Institute In Mendoza, Argentina.


A retrospective analysis of a database of 459 eyes implanted with ICRs in patients with keratoconus was performed, the cases were classified according to their shape or cone phenotype, identifying subsequently the frequency of selection of ICRs according to it, if 1 or 2 segments were used for each case, in which axis position the segments were located, the pachymetry, UDVA, CDVA and keratometrics value were analyzed with a series of complex mathematical techniques including the reverse engineering tool, the results shows the percentage of improvement in time for all the variables.Spss for windows was used fot the analysis


459 eyes with keratoconus identified between grades 1, 2 and 3 were analyzed, according to their cone phenotype 372 cases were described as Oval, 246 as Jay and 149 as Circular, 56.14% of were implanted with a single ICRs, an improvement in CDVA of 56% (range 56 <100), reduction of the cylinder of 43% and improvement in keratometrics value of 59% (range 44-100) over the initial value. In all cases significant statistical differences were evidenced for the variables of visual acuity, correction of the cylinder and decrease of the keratometries (KMAX).


This dynamic nomogram is based on evidence, has the peculiarity of being adaptable to the periodic changes established in time for each case, to be dynamic allow the surgeon to know in advance the values and percentages of improvement achieved in cases with similar characteristics of Our database

Financial Disclosure:


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