[Interferon-alpha toxicity and reversible bilateral optical neuropathy: a timely withdrawal of the drug].

Clinical case A patient with chronic, painless, bilateral loss of vision, after significant intake of interferon (IFNα) and ribavirina due to liver transplant. Ocular fundus is normal. A suspected retrobulbar optic neuropathy is confirmed by a prolongation of the latency of the patient's visual evoked potential.

[Corrective techniques of lacrimal obstruction in the vertical system].

Purpose: To describe current surgical techniques of dacryocystorhinostomy (DCR) and to compare their effectiveness by analysing the advantages and disadvantages between external, endonasal and transcanalicular surgery.

Patients And Methods: A total of 91 DCRs were analysed using a retrospective, cross-sectional and multicentre study in 75 patients who had symptoms of nasolacrimal duct obstruction. Of these, 28 were operated using external DCR, 31 endonasal technic, and 32 transcanalicular DCR with diode laser.

[Iridoschisis associated to congenital syphilis: serological confirmation at the 80's].

Clinical Case: Female in her eighties is admitted suffering from unilateral ocular pain. On examination we observed, as well as corneal abrasion, a bilateral iridoschisis with a frayed iris, unfolded between its stromal layers.

Discussion: This rare case is related either to senile degenerative change or to angle-closure glaucoma.

[Pterygium surgery: comparative study of conjunctival autograft with suture versus fibrin adhesive].

Purpose: To compare recurrence rate, complications, and biomicroscopical findings after conjunctival autograft pterygium surgery with the use of a fibrin glue (Tissucol Duo, Baxter AG, Vienna, Austria) or suture (7-0 silk).

Methods: Patients with nasal pterygium were included in two groups of conjunctival autograft surgery. In 9 of them the graft was sutured to the surrounding conjunctiva and in 8 of them the graft was fixed to the conjunctiva using fibrin glue.

[Congenital retinal macrovessels: a discovery by chance].

Clinical Case: Congenital retinal macrovessels, where an aberrant retinal vessel, usually a venule, is present in the posterior pole and may cross the avascular foveal region, are seen rarely.

Discussion: Most of these cases are unilateral and stable with excellent visual prognosis and are detected on routine examination. Foveal cysts, hemorrhages and displaced foveola may also be seen.