ABSTRACT
Aims: The aim of this study is to compare corneal parameters in: central corneal thickness (CCT), thinnest corneal thickness (TCT), mean radius of curvature (Rm) and anterior chamber depth (ACD) obtained from Pentacam Schiempflug and OCT Tomography imaging which are checked preoperatively and six months postoperatively after LASIK surgery.Methodology: Our sample consisted of 40 eyes. Changes in corneal dimensions were monitored before and after LASIK surgery using scheimpflug tomography (Pentacam HR) and optical coherence tomography (OCT). The parameters measured were CCT, TCT, Rm and the ACD. The results between the two techniques were compared with the Bland-Altman method.Results: During the analysis of the results, a statistically significant difference was observed between the two techniques in terms of the preoperative CCT as well as the TCT both preoperatively and postoperatively.Scheimpflug tomography gives higher values of the CCT than OCT, up to thickness 530nm, while above this it seems that OCT overestimates the thickness of the cornea. Scheimpflug tomography at the TCT seems to give higher values than OCT tomography, up to thickness 520 nm, while above that it seems that OCT tomography overestimates TCT. We have similar results postoperatively for TCT.The two techniques agree on the ACD and the Rm rating.Conclusion: How converging or different the two imaging devices are because it is important for both clinical practice and research may be a point of reference for starting a new research.
ABSTRACT
Objetivo: Describir las formas de presentación de la neuritis óptica, haciendo énfasis en el síndrome postviral y la neurítis óptica postviral, entidades que van de la mano, mostrando sus asociaciones de tipo local y sistémico. Adicionalmente, se muestra el seguimiento imaginológico realizado con tomografía óptica de coherencia, lo cual permite la observación clara del episodio agudo pero más allá de su diagnóstico por medio de la observación del fondo de ojo. Metodología: Se presenta un caso de neuritis óptica en una mujer de 25 años quien consulta por visión borrosa y fotofobia; se encontró en el fondo de ojo borramiento e hiperemia marcada del disco óptico asociado a pérdida marcada de agudeza visual en el ojo izquierdo; tiene historia de un episodio viral inespecífico, por lo que se hace diagnóstico de neuritis óptica anterior, posiblemente de origen postviral. Se descarta clínicamente enfermedad desmielinizante. Conclusiones: La neuritis óptica es una patología poco frecuente que tiene implicaciones serias en cuanto a pérdida irreversible de la agudeza visual si no se realiza diagnóstico y tratamiento oportuno; en este caso particular se sospechó origen viral aunque no fue confirmado.
Aim: To describe the different ways of clinic presentation of optic neuritis, empathizing in postviral syndrome and postviral optic neuritis; these entities are related in local and systemic compromises. In this case, the patient was ollowed with coherence optic tomography, which allowed a clear observation of the acute event and its evolution. Methodology: We present a case report of optic neuritis in a 25 years old woman, who complains for blurry vision and photophobia. Clinical examination showed blurring of the disk margin and marked hyperemia, associated with visual oss in left eye. This patient had an unexpected episode of viral infection, carrying us to a possible diagnosis of anterior optic neuritis from viral origin. Conclusions: Optic neuritis is an unfrequented condition that may have serious implications related to irreversible visual loss without opportune diagnosis and treatment.