A large area of the posterior pole of the retina of the miniature pig was photocoagulated, and 2-3 wk later the PO2 in the preretinal vitreous was mapped with O2-sensitive microelectrodes. In the control retina, the PO2 was highly heterogeneous being much higher close to an artery than opposite an intervascular zone. After photocoagulation, PO2 opposite an intervascular zone was found to be sig...

The idiopathic retinitis, vasculitis, aneurysms and neuroretinitis syndrome is a rare retinal vascular disorder characterized by multiple leaking aneurysmal dilations, retinal vasculitis, neuroretinitis and peripheral vascular ischemia. Visual loss mainly occurs due to the development of retinal neovascularization and/or exudative maculopathy. Although the treatment of choice has not yet been e...

An 84-year-old female with a history of hypertension and dyslipidemia was referred for a retinal artery macroaneurysm with exudation that had extended into the macula. She underwent a total of six injections of bevacizumab, with some improvement in visual acuity and retinal thickness. Due to persistent macular edema, focal laser photocoagulation was performed around the macroaneurysm. The visio...

CLINICAL CASE Man carrier of the von Hippel-Lindau (VHL) gene, with long-onset loss of vision in left eye. He had a retinal capillary hemangioma (HCR) and diffuse cystic edema in posterior pole. The systemic study revealed bilateral kidney tumors. Laser photocoagulation was performed which produced a subretinal and vitreous hemorrhage that required vitrectomy. DISCUSSION Retinal capillary hem...

CASE REPORT A 34 year-old man presented with progressive visual loss in his right eye. Ocular fundus showed a vasoproliferative tumor in the peripheral retina with an associated epiretinal macular membrane. Angiography showed a rapid filling of tumor vessels. The treatment consisted of laser photocoagulation and a single injection of intravitreal ranibizumab. After 8 weeks, there was a residual...

In a prospective randomised trial of argon laser photocoagulation in the management of central serous retinopathy, long-term follow-up (6.4 to 12.1 years) revealed no evidence that treatment significantly influenced the visual outcome as measured by the Snellen chart and by the Farnsworth-Munsell 100-hue test. Treatment did not reduce either the recurrence rate or the prevalence of chronic dise...

Panretinal Photocoagulation (PRP) has been approved as an effective treatment for stopping retinal neovascularization in patients with severe diabetic retinopathy [1-3]. This treatment constitutes performing multiple laser photocoagulation sessions on the peripheral retina with the purpose of destroying photoreceptor and retinal pigment epithelium cells under the treated retina. While PRP damag...

104 consecutive patients with upper gastrointestinal bleeding admitted to a district general hospital over a period of 20 months were considered for laser photocoagulation. 58 patients were found to have peptic ulcers, of which 42 had stigmata of recent haemorrhage accessible to laser photocoagulation. 17 were treated with a Nd-YAG laser and 25 were managed conservatively. There was no signific...

The normal distribution of the retinal blood flow in the cat eye was modified by photocoagulation to part of the territory supplied by a major arteriole, or by occluding a branch. Volume inflow to the treated territory was reduced, and there was also a reduction of linear flow and, to a less extent, calibre in the parent vessel. Branches of the parent vessel supplying untreated territory showed...