Treatment of irregular astigmatism by topography-guided ablation / Tratamento do astigmatismo irregular por ablação guiada por topografia

ABSTRACT Topography-guided ablation was designed to improve corneal regularity throughout the correction of corneal high order aberrations. The present report described three cases with different indications for topography-guided ablation to correct irregular astigmatism. The patients were monitored in the immediate and late postoperative periods to evaluate long-term corneal stabilization. Surgery indications were based on the patient's complaint of poor quality of vision associated with previous radial keratotomy, corneal transplant, or keratoconus. In all three cases, the patients reported an improvement in the quality of their vision and expressed satisfaction with the procedure; however, the patient who had previously been submitted to crosslinking presented with keratoconus progression in the late postoperative period. Finally, topography-guided customized ablation appears to represent a safe and effective technique for reducing corneal irregularities.

RESUMO A ablação guiada por topografia foi projetada para melhorar a regularidade da córnea durante a correção de aberrações de alta ordem da córnea. O presente relato descreveu três casos com diferentes indicações de ablação guiada por topografia para correção de astigmatismo irregular. Os pacientes foram monitorados no pós-operatório imediato e tardio para avaliar a estabilização corneana em longo prazo. As indicações cirúrgicas basearam-se na queixa do paciente de má qualidade de visão associada a ceratotomia radial prévia, transplante de córnea ou ceratocone. Nos três casos, os pacientes relataram melhora na qualidade da visão e manifestaram satisfação com o procedimento; entretanto, o paciente que já havia sido submetido ao crosslinking apresentou progressão do ceratocone no pós-operatório tardio. Finalmente, a ablação personalizada guiada por topografia parece representar uma técnica segura e eficaz para reduzir irregularidades da córnea em córneas não ectásicas.

Post-operative complications of penetrating corneal keratoplasty in patients with anterior segment toxic syndrome secondary to cataract surgery

INTRODUCTION: Toxic Anterior Segment Syndrome (TASS) after cataract surgery may cause severe corneal decompensation that compromises corneal transparency and may require penetrating corneal keratoplasty to improve visual acuity. OBJECTIVE: We evaluated the postoperative complications of patients who underwent penetrating corneal transplantation for severe corneal decompensation secondary to TASS after cataract surgery, such as persistent epithelial defect, glaucoma, and primary and secondary transplant button failure. We will also evaluate pre- and postoperative visual acuity, graft survival time, and the presence of anterior chamber disorganization. METHODS: Retrospective observational study in which a review of medical records of 9 patients diagnosed with TASS after cataract surgery who underwent penetrating corneal keratoplasty will occur. RESULTS: In the present study all operated patients had glaucoma after penetrating corneal transplantation, and this presence of glaucoma was not correlated with graft survival time and with any other parameter evaluated. The presence of persistent epithelial defect correlated negatively with visual acuity. CONCLUSION: Postoperative complications of penetrating corneal transplantation in patients with TASS were frequent, such as glaucoma, primary and secondary button failure and persistent epithelial defect. The only complication that compromised visual acuity was the persistent epithelial defect. All patients evolved with glaucoma.

Epidemiological profile and study on waiting lists for corneal transplants in a tertiary hospital

INTRODUCTION: Epidemiological studies and about patients' waiting time on queues for corneal transplantation are important, as they allow us to know the assisted population and assist the medical team. OBJECTIVE: To evaluate the epidemiological and demographic profile of patients undergoing corneal transplantation from January 2014 to September 2018 at a teaching hospital in the city of Santo André, as well as their waiting time for the procedure. METHODS: Retrospective descriptive study, performed through analysis of medical records and data from the website of the Government of the State of São Paulo's transplant center. The study was conducted at the External and Corneal Diseases sector of the discipline of Ophthalmology from Centro Universitário FMABC. The following data were evaluated: gender, age, race, origin and waiting time for the patient to have a transplant. RESULTS: A total of 139 corneal transplant patients were recruited for the study, with a mean age of 47.4±23 years. According to gender, just over half of the transplanted were female (50.4%). Regarding to skin color, 45.3% of the patients were white, 44.6% were brown and 10.1% were black. As for their origin, most patients were from the city of Santo André. CONCLUSION: This study enabled the assessment and knowledge of the epidemiological profile and waiting time for corneal transplantation in our patients. This information is important, as it helps us to understand the profile of the assisted population and in the organization and planning of the medical team, contributing to better guidance and care for the patients.