[Active drainage combined with air-fluid exchange for silicone oil removal: advantages and long-term follow-up].

Introduction: A number of silicone oil removal procedures are in use today. The purpose of this study was to evaluate the advantages of active drainage with air-fluid exchange for silicone oil removal.

Patients And Methods: We conducted a prospective study on patients operated on for retinal detachment with vitrectomy with silicone oil intraocular tamponade between January 2005 and January 2006.

Linear dichroism of the retinal nerve fiber layer expressed with Mueller matrices.

An electro-optic device is used that permits the measurement of polarized absorption spectra (linear dichroism). The change of the polarization state of a light beam brought about by passage through the optic elements of a dichrograph are described mathematically by a transformation of the Stokes vector. The polarization or absorption properties of the optical elements are described by the Mueller matrices.

Linear dichroism of the cornea.

The dichroic properties of in vitro sheep corneas were studied with a spectrophotometer in transmission mode for several angles of incidence of light beams. Several models of corneal anisotropy have been presented in the literature. The results presented here allow us to believe that the cornea behaves as a dichroic biaxial crystal.

[Circulatory consequences of retinal vein occlusions. Advantages of dynamic angiography].

Purpose: To compare angiographic features in patients with branch vein (BRVO) and central retinal vein occlusion (CRVO) and to discuss their possible significance.

Patients And Methods: Clinical and indocyanine green (ICG) videoangiographic data of 35 patients with CRVO and 5 patients with BRVO were reviewed. In order to more fully understand the significance of hemodynamic alterations, patients with a decrease in retinal flow velocity from other causes (optic neuritis, carotid-cavernous fistula, carotid artery stenosis) were compared to patients with vein occlusion.

Analysis of retinal and choroidal circulation during central retinal vein occlusion using indocyanine green videoangiography.

Objective: To explore the hemodynamic changes and their correlation with clinical presentation during central retinal vein occlusion.

Materials And Methods: Retrospective, 2-center study. The medical records of 27 patients with central retinal vein occlusion were reviewed.