RESUMO
A lens coloboma is not a true coloboma; it is just a zonular absence that causes a defect in the lens equator and hence a more spherical lens. It can be isolated or in association with iris, choroid or retinal colobomas. Typically the defect is present at the site of the embryonic fissure, but it can be present elsewhere. This congenital defect can cause amblyopia, especially when it is associated with cataract. We describe a case of a 39-year-old male with an atypical coloboma that was managed successfully with phacoemulsification, capsular tension ring and intraocular lens implantation. Scheimpflug image analysis and full ophthalmological assessment were performed. Scheimpflug images demonstrated a notching of the lens equator and an absence of zonulae. During the surgical procedure an ophthalmic viscosurgical device was used to tamponade the vitreous, and after continuous curvilinear capsulorhexis the capsular tension ring was inserted to allow the surgeon to perform a safe phacoemulsification.
RESUMO
Objetivo: evaluar la efectividad de la iridoplastia periférica con Nd YAG láser doblado mediante imágenes de Scheimpflug y gonioscopia.Métodos: estudio longitudinal descriptivo prospectivo en 40 ojos (23 pacientes) con cierre angular residual (grado 0-2 según Shaffer) por bloqueo pupilar (n=30) o por síndrome de iris plateau (n=10). La presión intraocular, gonioscopia e imágenes de Scheimpflug (Oculus Pentacam) fueron obtenidas antes de la cirugía y 1 semana después, y luego comparadas.Resultados: 70 porciento de los ojos con bloqueo pupilar (p=0,00) y 100 porciento con iris plateau mostraron gonioscópicamente ángulos grado 2-3 (según Shaffer) en el posoperatorio. Las imágenes de Scheimpflug no evidenciaron modificación de la abertura angular posquirúrgica (p=0,696, p=0,572, bloqueo pupilar; p=0,053, p=0,113, iris plateau). El volumen medio de la cámara anterior (p=0,001 y p=0,008) y el diámetro pupilar (p=0,002, bloqueo pupilar) se incrementaron significativamente. Se obtuvo una reducción posoperatoria de la presión intraocular de 2,4 mmHg (p=0,004, bloqueo pupilar) y 3,6 mmHg (p=0,011, iris plateau). Las complicaciones fueron mínimas y fueron resueltas con tratamiento tópico.Conclusiones: la iridoplastia con Nd YAG láser es efectiva y segura. Las imágenes de Scheimpflug no son útiles para adquirir mensuraciones precisas de la amplitud del ángulo camerular
Objective: to assess the effectiveness of double-frequency Nd YAG laser peripheral iridoplasty using Scheimpflug images and gonioscopy.Methods: longitudinal prospective and descriptive study of 40 eyes (23 patients) with residual angle-closure (Shaffer´s grade 0-2) due to pupillary block (n=30) or plateau iris syndrome (n=10). The gonioscopy, Scheimpflug images (Oculus Pentacam) and intraocular pressure were obtained preoperatively and one week postoperatively and then compared.Results: of the surgical eyes, 70 per cent with pupillary block (p=0,000) and the 100 per cent with plateau iris were Shaffer´s grade 2-3 postoperatively. The Scheimpflug images did not show changes on angle openness after surgery (p=0,696, p=0,572, pupillary block; p=0,053, p=0,113, plateau iris). The mean volume of anterior chamber (p=0,001 and p=0,008) and the pupil diameter (p=0,002 in pupillary block) significantly increased The intraocular pressure reduction of 2,4 mmHg (p=0,004, pupillary block) and 3,6 mmHg (p=0,011, plateau iris) was obtained. Complications were minimal and responded well to topical treatment.Conclusion: the Nd YAG laser peripheral iridoplasty is effective and safe. Scheimpflug images are not useful for precise measurements of angle openness