In two adolescents, mild vitreous hemorrhage occurred from the area of retinal arterial loops near the optic nerve. In both cases the hemorrhage cleared without further complications. This vascular ...malformation may be associated with secondary complications more frequently than has previously been reported.
The authors studied the eyes postmortem from six patients who were enrolled in the multicenter Diabetic Retinopathy Study and treated by photocoagulation. All were patients of the Wilmer Institute, ...The Johns Hopkins Hospital. Of these six patients, four had equal or better vision in the treated eye at their last visit. Two patients had worse vision, due primarily to cystoid macular edema. All but one patient had clinically significant field loss in the treated eye, and this correlated with the retinal damage induced by photocoagulation. This treatment produced local retinal and choroidal effects and did not alter the histopathologic appearance of the anterior segment of the eye.
Argon laser photocoagulation was performed on 30 patients with ocular histoplasmosis syndrome involving the macula. Selection of patients for photocoagulation was dependent upon locating the ...sub-retinal neovascularization (SRNV) at least one vein-width removed from the capillary-free zone of the fovea on fluorescein angiography. Of the 30 treated patients, 27 maintained or improved visual acuity an average of 1 1/2 years following photocoagulation.
Diabetic macular edema Patz, A; Fine, S L
International ophthalmology clinics,
1976-Winter, Letnik:
16, Številka:
4
Journal Article
Recenzirano
Photocoagulation by either the argon laser or xenon arc instruments has been reported to have a beneficial effect in selected patients with macular edema. Treatment is not effective in all cases; ...indeed, in some patients with perifoveal capillary closure, severe macular edema, long-standing organized hard exudates, or significant cystoid maculopathy, treatment has proved to be ineffective. Findings associated with a generally favorable or an unfavorable prognosis following photocoagulation are discussed in this chapter, along with proper management of the patient's systemic status, with particular emphasis on the problem of hypertension, important in patients with diabetic macular edema. Because the results of photocoagulation are limited in a significant number of patients, further research into the basic pathogenetic mechanisms involved in increased retinal capillary permeability to recommended, with the hope of providing more effective therapy.
Two patients who had lost central vision in one eye due to a histoplasmic disciform macular scar received prophylactic argon laser photocoagulation to one or more atrophic lesions (histo spots) in ...the second macula in an effort to reduce the risk of developing active neovascularization in the second eye. Despite this prophylactic treatment, both patients developed a choroidal neovascular membrane from the photocoagulation scar.
Argon laser and xenon arc photocoagulation can be utilized to obliterate choroidal neovascularization in selected cases of macular histoplasmosis. Central vision can be preserved in many instances if ...criteria for patient selection, treatment techniques, and method of follow-up, as described in this chapter, are adhered to rigidly. Of 40 patients treated with argon laser photocoagulation, 75 percent maintained or improved central vision an average of one year following treatment. Nonetheless, there is a definite need for a prospective controlled study to document the efficacy of this mode of treatment on a long-term basis.
Closer collaboration among ecologists, systematists, and evolutionary biologists working in tropical forests, centred on studies within long-term permanent plots, would be highly beneficial for their ...respective fields. With a key unifying theme of the importance of vouchered collection and precise identification of species, especially rare ones, we identify four priority areas where improving links between these communities could achieve significant progress in biodiversity and conservation science: (i) increasing the pace of species discovery; (ii) documenting species turnover across space and time; (iii) improving models of ecosystem change; and (iv) understanding the evolutionary assembly of communities and biomes.
Key research questions are defined to foster closer collaboration between systematists, ecologists, and evolutionary biologists working in tropical forests.
Long-term plots are proposed as a focus of such collaborative studies.
Addressing the proposed questions will require a significant shift in how both individuals and institutions operate in the collection and curation of botanical specimens.
Sixty-eight eyes in 67 patients with a histoplasmic neovascular membrane treated with Argon laser photocoagulation between 1972 and 1978 are reviewed. Factors affecting visual outcome and causes of ...visual failure are discussed. Twenty of 68 eyes (nearly 30%) experienced a recurrent or new SRNVM after initially successful treatment. Final evaluation of Argon laser photocoagulation for histoplasmic neovascular membrane must await the outcome of the Macular Photocoagulation Study.
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