Biomedical subjects
Publications and source records attributed to K Hubel.
Using the first film documentation of such a case, the differential diagnostic and therapeutic difficulties in a case of live intravitreal Filaria are discussed. The visual acuity of the affected eye was unimpaired. The parasite was destroyed by systemic anthelmintic therapy. The only functional damage to the eye was that the visual field was concentrically reduced to approximately 40 degrees.
In this paper 21 cases of branch vein thrombosis and 15 cases of central retinal vein thrombosis treated by argon laser photocoagulation are compared with an untreated control group. The visual prognosis after photocoagulation was no better in the treated group than in the control group. After central retinal vein occlusion, three cases of hemorrhagic glaucoma (20%) were observed in the control group but there was no rubeosis iridis or hemorrhagic glaucoma in the group treated by argon laser therapy.
In three patients with psychogenic amblyopia the computerized visual field, the ERG, the flash light (H-EP) and pattern reversal stimulated (M-EP) cortical potentials were recorded. Differential diagnosis between psychogenic amblyopia on the one hand, and functional amblyopia and organic lesions of the retrobulbar visual pathways on the other was shown to be possible. In the cases with organic retrobulbar lesions of visual pathways, visual field defects and pathologic H-EP's and M-EP's were found. In functional amblyopia only the M-EP responses are diminished in amplitude. In psychogenic amblyopia only the computerized visual field shows pathologic changes.
Report of a case with melanosis bulbi observed in a relatively young patient of 33 years, in which a malignant melanoma of the choroid developed. As reported in earlier examinations the incidence of malignant melanoma in cases of melanosis bulbi is much higher than in normal eyes. The authors recommend strongly routine biomicroscopic examinations in cases of melanosis bulbi every 1--2 years to recognize the development of a melanoma in an early stage.