Secondary glaucoma induced by bilateral acute depigmentation of the iris / Glaucoma secundário à despigmentação bilateral aguda da íris

Abstract We report a case of a middle-aged woman who developed acute, bilateral, symmetrical, slightly transilluminating depigmentation of the iris and pigment discharge into the anterior chamber following the use of oral moxifloxacin for bacterial sinusitis. She had been misdiagnosed as having autoimmune uveitis, treated with steroids and tropicamide, and underwent severe ocular hypertension and glaucoma despite posterior correct diagnosis.

Resumo Relato de um caso de uma paciente do sexo feminino de meia idade que desenvolveu despigmentação bilateral simultânea aguda com dispersão de pigmentos na câmara anterior e discreta transiluminação após o uso de moxifloxacino oral para tratamento de sinusite bacteriana. Ela Havia sido diagnosticada com uveite autoimune e tratada com corticosteroide tópico e tropicamida e evoluiu com hipertensão ocular grave e glaucoma apesar de ,posteriormente, o diagnóstico ter sido correto.

Bilateral acute depigmentation of the iris: a case report / Despigmentação aguda bilateral da íris: um relato de caso

ABSTRACT Bilateral acute depigmentation of the iris (BADI) is a new clinical entity of unknown etiology and is characterized by bilateral, symmetrical, and simultaneous depigmentation of the iris with focal or diffuse stromal atrophy; this condition generally has a good prognosis. We present a case of a 26-year-old woman who noted a spontaneous change in the iris color in both eyes in the last 2 months. The ophthalmological findings were atrophy of the iris stroma and pigmentation of the trabecular meshwork, without affecting the pigmented epithelium of the iris. Her intraocular pressure was normal and the visual acuity was 20/20 in both eyes.

RESUMO A despigmentação aguda bilateral da íris (DABI) é uma nova entidade clínica caracterizada pela despigmentação bilateral, simétrica e simultânea da íris, com atrofia focal ou difusa do seu estroma, geralmente com bom prognóstico. Apresentamos o caso de uma mulher de 26 anos de idade que procurou atendimento médico em nosso serviço com queixa de mudança espontânea na cor da íris de ambos os olhos nos últimos dois meses. Os achados oftalmológicos observados durante o exame clínico foram atrofia do estroma da íris e pigmentação da malha trabecular, sem afetar o epitélio pigmentado da íris. A pressão intraocular era normal e acuidade visual de 20/20 em ambos os olhos.

Recurrent Occlusion of Laser Iridotomy Sites After Posterior Chamber Phakic IOL Implantation

We report a case of recurrent occlusion of laser iridotomy (LI) sites after a Visian ICL (Implantable contact lens version 4, Staar Surgical AG, Nidau, Switzerland) implantation. A 45-year-old woman had bilateral ICL implantation after placement of two peripheral LI sites in each eye to prevent pupillary block. At one month after the operation, severe narrowing or occlusion of four LI sites occurred. After this, although she received four additional LIs at postoperative months 1, 6, 9 and 10 in both eyes, the narrowing or occlusion recurred. Mild chronic anterior chamber inflammation was observed intermittently throughout the follow-up period. We performed clear lens extraction in both eyes (at postoperative month 11 in the left eye and month 26 in the right eye) due to recurrent occlusion of the LI sites and excess trabecular meshwork pigment deposition presumably caused by the four repeated LIs. Recurrent obstruction of LI sites can occur after ICL implantation. These problems were unresolvable despite four repeated laser iridotomies. The risks associated with anterior uveitis must be considered when planning an ICL implantation.

Peripheral Anterior Synechiae and Ultrasound Biomicroscopic Parameters in Angle-Closure Glaucoma Suspects

PURPOSE: To investigate the correlation between peripheral anterior synechia (PAS) and the quantitative anterior chamber angle parameters measured by ultrasound microscopy (UBM) in angle-closure glaucoma suspect (ACGS) eyes. METHODS: Eyes were defined ACGS as having occludable angles and intraocular pressure less than 21 mm Hg without glaucomatous optic nerve head. The gonioscopic criteria for ACGS were the trabecular meshwork invisible in 3 or more quadrants of the entire angle and the angular width less than 20 degrees by Shaffer classification. Twenty-seven eyes of 20 patients underwent anterior chamber angle and ciliary body imaging with UBM. Angle opening distance (AOD500), angle recess area (ARA), trabecular-ciliary process distance (TCPD) and trabecular-iris angle (TIA) were measured from the UBM images at each quadrant. RESULTS: The AOD500, ARA, and TIA were not significantly different between the eyes with PAS (9 eyes) and without PAS (18 eyes) at each quadrant. However, the TCPD was significantly shorter in the superior quadrant when compared with the eyes without PAS (mean: 405.3+/-70.9 micrometer vs 536.4+/-140.5 micrometer) (p<0.05). CONCLUSIONS: The results suggest that the shorter distance from trabecular meshwork to ciliary body or the anterior placement of ciliary process may play a role in the development of PAS in ACGS eyes.

The trabecular meshwork in acute and chronic angle closure glaucoma.

PURPOSE: To determine the effect of acute and chronic primary angle closure glaucoma (PACG) on the trabecular meshwork. METHODS: Trabecular specimens of 16 consecutive patients with primary angle closure glaucoma (PACG)--6 acute PACG eyes, and 10 chronic PACG eyes without an acute attack--were studied by light and electron microscopy. RESULTS: Acute PACG: The trabecular meshwork revealed a generalised oedema and an accumulation of pigment in the widened trabecular spaces and Schlemm's canal. Attenuated trabecular endothelial cells appeared to be devoid of subcellular components. Chronic PACG: In chronic PACG eyes the trabecular architecture had lost its regular arrangement, with fewer and narrower trabecular spaces and fusion of the trabecular beams in areas. There were numerous electron-dense bodies in the trabecular tissues, both within the trabecular beams and in the extracellular spaces, which had a banded fibrillar structure. An overall loss of endothelial cells was noted; the remaining cells were crowded together and were polymorphic. Melanin pigment was present both within the stroma and in the endothelial cells. CONCLUSIONS: Pigment accumulation in the trabecular spaces and within the cells and a noninflammatory degeneration appeared to be the primary changes in the trabecular meshwork after acute angle closure glaucoma. In chronic PACG eyes, there was evidence of loss of endothelial cells and reactive repair processes. These changes were present in areas away from visible peripheral anterior synechiae. A gonioscopic evaluation of the extent of peripheral anterior synechiae alone may not reflect the extent of trabecular meshwork damage in acute and chronic PACG. Patients experiencing an acute attack of PACG require a long-term follow up, because the intraocular pressure (IOP) may rise later, due to ongoing changes compromising the outflow facility, or due to the effects of aging in the trabecular meshwork.

Glaucoma secundario a uveitis / Glaucoma secondary to uveitis

El glaucoma en la uveitis se presenta entre el 20 y 50% de los casos, complicando notablemente el manejo del problema. Por ello es necesario la determinación de la presión ocular en forma rutinaria en uveitis. Es necesario determinar en primer lugar la patogenia del glaucoma. La gonioscopía permite separar los glaucomas de ángulo abierto de los de ángulo cerrado. El glaucoma de ángulo abierto puede deberse a obstrucción del drenaje por células inflamatórias y proteínas, precipitados trabeculares, fibrosis trabecular, corticoesteroides y la hipersecreción o asociado a retinocoroiditis. Cuando el ángulo está cerrado esto se debe generalmente a sinequias posteriores del iris asociado a iris bombé, goniosinequias o bien a glaucoma mixto. No debe descartarse la posibilidad de que el caso sea una uveitis en un paciente portador de glaucoma. En la determinación de la patogenia del glaucoma es fundamental determinar el grado de actividad de la uveitis, el estado del ángulo mediante la gonioscopía, la facilidad de salida, el examen biomicroscópico y el fondo del ojo que permiten clasificar la uveitis subyacente y estado de las estructuras correspondientes. En manejo del glaucoma en la uveitis, antiinflamatorio asociado a drogas antiglaucoma, cirugía filtrante, iridectomía o ciclocrioterapia, dependerá de diversos factores que es necesario analizar en cada caso entre los que destaca el nivel de visión, grado de actividad inflamatoria, mecanismo patogénico del glaucoma, tipo de uveitis, respuesta de la presión al tratamiento antiinflamatorio, a las drogas antiglaucoma, nivel de la presión ocular, estado de la papila del nervio óptico y estado del campo visual