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Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2023.tde-23022024-150648
Document
Author
Full name
Evandro Ribeiro Diniz
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Committee
Alves, Milton Ruiz (President)
Louzada, Ricardo Noguera
Carricondo, Pedro Carlos
Lui Netto, Adamo
Title in Portuguese
Resultados visuais, topográficos e refrativos do implante de segmentos assimétricos de anel corneano intraestromal em ceratocone
Keywords in Portuguese
Aberrometria de córnea
Acuidade visual
Astigmatismo
Ceratocone
Segmento assimétrico de anel corneano intraestromal
Topografia de córnea
Abstract in Portuguese
Objetivo: Avaliar os resultados visuais, topográficos e refrativos do implante de segmentos assimétricos de anel intracorneano ICRS (AS) em olhos com ceratocone e astigmatismo irregular/assimétrico (fenótipos tipo 2 Duck e 3 Snowman - pela classificação morfológica do ceratocone de Fernandez-Vega/Alfonso). Métodos: Estudo clínico prospectivo realizado com 60 pacientes (60 0lhos) com ceratocone que tiveram segmentos de Keraring® ICRS (AS) selecionados e implantados de acordo com o nomograma MediphacosTM (http://Keraring.online) com laser femtosegundo. As avaliações pré-operatórias e pós-operatórias incluíram medida de acuidade visual não corrigida (AVSC), melhor acuidade visual corrigida (AVCC), astigmatismo refracional, equivalente esférico; e astigmatismo topográfico, Kmax e coma, medidos com o Galilei (Ziemer, Port, Suíça). Todos os parâmetros foram avaliados no pré-operatório, e aos 3 e 6 meses de pós-operatório. Resultados: A média de idade dos pacientes foi de 26,34 ± 8,49 anos; 28 (56,7%) eram do sexo feminino, 34 olhos apresentavam ceratocone de fenótipo tipo 2 e ou outros 26 olhos de fenótipo tipo 3. Aos 6 meses de pós-operatório, os olhos de fenótipo tipo 2 obtiveram ganhos na AVSC e AVCC de 0,30 LogMAR e 0,15 LogMAR, respectivamente; e reduções de 2,30D no astigmatismo topográfico; 2,45 D no Kmax; 0,32 m no coma; 1,63 D no astigmatismo refracional e 1,88 D no equivalente esférico. Aos 6 meses, os olhos de fenótipo tipo 3 foram obtiveram ganhos na AVSC e AVCC de 0,50 logMAR e 0,10 LogMAR, respectivamente; e reduções de 3,00D no astigmatismo topográfico; 5,20 D no Kmax; 0,09 m no coma; 2,00 D no astigmatismo refracional e 4,25 D no equivalente esférico. Os resultados das comparações entre 3 e 6 meses de pós-operatório não foram estatisticamente significativos para nenhuma das variáveis avaliadas o que denota a estabilidade do procedimento nesse tempo de seguimento. Conclusões: O implante de segmentos de Keraring® ICRS (AS) O em olhos com ceratocone com astigmatismo assimétrico/irregular (fenótipos tipo 2 e 3) melhoraram os parâmetros visuais, topográficos e refrativos com segurança e eficácia clínica
Title in English
Visual, topographic, and refractive outcomes of the implantation of asymmetric segments of the intrastromal corneal ring in keratoconus
Keywords in English
Astigmatism
Asymmetrical segment of intracorneal ring
Corneal aberrometry
Corneal topography
Keratoconus
Visual acuity
Abstract in English
Purpose: To evaluate the visual, topographic, and refractive outcomes of the implantation of asymmetric segments of the ICRS intracorneal ring (AS) in eyes with keratoconus and irregular/asymmetric astigmatism (phenotypes type 2 Duck and 3 Snowman - by morphological classification of Fernandez-Vega/Alfonso Keratoconus). Methods: Prospective clinical study including 60 patients (60 eyes) with keratoconus who underwent implantation of the Keraring® ICRS (AS) selected and implanted according to the MediphacosTM nomogram (http://Keraring.online) with femtosecond laser. Preoperative and postoperative evaluations included uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refractive astigmatism, spherical equivalent, and topographic astigmatism, Kmax and coma measured with the Galilei (Ziemer, Port, Suíça). All parameters were assessed preoperatively and at 3 and 6 months postoperatively. Results: Overall mean age was 26.34 ± 8.49 years; 28 (56.7%) were female, 34 eyes had keratoconus of type 2 phenotype and another 26 eyes of type 3 phenotype. At 6 months postoperatively, eyes with type 2 phenotype obtained gains in UCVA and BCVA of 0.30 LogMAR and 0.15 LogMAR, respectively; and reductions of 2.30D in topographic astigmatism; 2.45 D in Kmax; 0.32 m in coma; 1.63 D in refractive astigmatism and 1.88 D in spherical equivalent. At 6 months, eyes with type 3 phenotype obtained gains in UDVA and CDVA of 0.50 logMAR and 0.10 LogMAR, respectively; and reductions of 3.00 D in topographic astigmatism; 5.20 D in Kmax; 0.09 m in coma; 2.00 D in refractive astigmatism and 4.25 D in spherical equivalent. The results of the comparisons at 3 and 6 months postoperatively were not statistically significant for any of the variables evaluated, which denotes the stability of the procedure in this follow-up time. Conclusions: Implantation of the Keraring® ICRS (AS) in eyes with keratoconus and asymmetric/irregular astigmatism (type 2 and 3 phenotypes) improved visual, topographic, and refractive parameters with safety and clinical efficacy
 
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Publishing Date
2024-03-01
 
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