Corneal ectasia after laser in situ keratomileusis

Argento, Carlos; Cosentino, Marı́a José; Tytiun, Adriana; Rapetti, Gustavo; Zárate, Jorge

doi:10.1016/s0886-3350(01)00799-4

Cited by 125 publications

(83 citation statements)

References 9 publications

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“…Acarreta aumento do astigmatismo, da miopia, com, conseqüente diminuição da acuidade visual. Geralmente ocorre em córneas que apresentam espessura corneana residual pós-ablação inferior a 250 µm (5)(6)(7)(8) . É importante lembrar que as alterações nos valores da PIO pós-cirurgia refrativa podem ser influenciadas pela modificação da espessura corneana (4) .…”

Section: Discussionunclassified

“…É importante lembrar que as alterações nos valores da PIO pós-cirurgia refrativa podem ser influenciadas pela modificação da espessura corneana (4) . Isso ocorre principalmente quando são utilizados os tonômetros de aplanação e de não-contato, pois esses apresentam medidas precisas somente quando a espessura corneana é próxima de 0,52 mm (5)(6) . Cór-neas espessas podem resultar em medidas falsamente aumentadas, e córneas delgadas em medidas falsamente diminuídas.…”

Section: Discussionunclassified

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Regressão refrativa total pós-LASIK: relato de caso

Gus¹,

Matos²,

Bayer³

2005

Arq. Bras. Oftalmol.

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Section: Discussionunclassified

Regressão refrativa total pós-LASIK: relato de caso

Gus¹,

Matos²,

Bayer³

2005

Arq. Bras. Oftalmol.

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“…Reduced thickness of the RSB is implicated in the development of iatrogenic keratectasia in normal corneas following LASIK. 11,[40][41][42][43] A minimum RSB thickness of 250 mm is considered necessary for the prevention of keratectasia. 11,44 Thicker corneal flaps may result in either excessively reduced stromal bed in cases of very deep lamellar cut 12 or deeper ablations weakening the biomechanical structure of the cornea, 40,45 whereas thinner flaps result in more superficial ablations maximising the RSB, thus reducing the risk of keratectasia.…”

Section: Discussionmentioning

confidence: 99%

The effect of flap thickness on the visual and refractive outcome of myopic laser in situ keratomileusis

Eleftheriadis

Prandi

Diaz-Rato

et al. 2004

Eye

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Aims To study the effect of flap thickness on the visual and refractive outcome of myopic laser in situ keratomileusis (LASIK) surgery. Methods A total of 196 myopic eyes with spherical equivalent (SE) from À2.00 to À5.00 dioptres which underwent LASIK were studied retrospectively. Uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA) and manifest refraction were measured up to 6 months postoperatively. Logistic and linear regression analyses were used to examine the correlation of flap thickness to visual and refractive outcomes, postoperative complications and enhancement rate. Results UCVA at 1 week and 1 month, but not at 1 day and at 6 months (P40.05), were negatively correlated to flap thickness (Po0.05). BCVA was unrelated to flap thickness (P40.05). At 1-month post-LASIK sphere and cylinder were not related to flap thickness (P40.05), but spherical equivalent was negatively correlated (Po0.05). Significant negative correlations with the sphere and SE were noticed at 6 months for the eyes not requiring enhancements (Po0.05). Flap thickness had no significant relationship to postoperative complications (P40.05) and no significant predictive value on the rate of enhancement procedures or the efficacy, safety and predictability indices (P40.05). Conclusions In myopic LASIK thinner flaps are associated with faster visual recovery and less myopic SE, but the BCVA and the final UCVA are independent of flap thickness. Postoperative complications are unrelated to flap thickness. Flap thickness does not affect the efficacy, safety and predictability, or the rate of enhancement procedures.

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“…Grupo estudio (5,6,10). Además se han descrito cambios significativos en la curvatura de la cara posterior de la córnea tras los retratamientos (11) en pacientes sin ectasia pero que traducen la importancia de evaluar adecuadamente a los pacientes antes de repetir la cirugía para no caer en las complicaciones.…”

Section: Grupo Controlunclassified

“…Por ello el retratamiento, además de garantizarnos ajustar definitivamente la refracción del paciente, debe ser muy seguro. Sin embargo desde hace tiempo se viene describiendo un incremento en el número de ectasias post-retratamiento (5,6).…”

Section: Introductionunclassified