Visual field defects in psychiatric disorders: possible genetic implications.
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Adult↗
Biomedical subjects
L Barroso
Publications and source records attributed to L Barroso.
Primary structure of the speC gene encoding biosynthetic ornithine decarboxylase in Escherichia coli.
A 2.91-kb fragment of the Escherichia coli chromosome containing the speC gene, encoding biosynthetic ornithine decarboxylase (ODC) was sequenced. The speC gene is encoded by a 2133-bp ORF; the deduced amino-acid sequence contains 711 residues whose predicted molecular mass is 79,505 Da.
Amino Acid Sequence↗
Cataract: a critical problem in the developing world.
Cataract blindness is a major public health problem worldwide. Unlike other leading causes of blindness, cataract can be treated effectively with surgery. Demographic, social, and economic factors are important determinants of surgical treatment of this disorder in the developing world, resulting in the accumulation of very large numbers of unoperated cases. Because of many factors, the problem is really out of hand. In this paper, we try to raise awareness among optometrists of this major challenge. At the same time, because many individuals do not achieve good vision after surgery and because in most developing countries only one eye is operated upon, we emphasize the use of improved prognostic techniques to make the surgical outcome more predictable, avoiding nonproductive surgery and resultant disappointment on the part of all concerned. We feel optometry can play important roles in diagnosis, visual correction, and management of these patients, hopefully in cooperation with ophthalmic surgeons.
Blindness↗
Disc edge veins of Kraupa: rare exit anomalies of the retinal vein.
Disc edge veins of Kraupa are anomalies of the retinal venous system in which blood flows from the retina through a single venous trunk at or near the edge of the disc instead of at its centre. We report two examples of patients with these anomalies and illustrate the appearance of the anomalies with fundus photographs and a fluorescein angiogram. In one patient the retinal vein exited the eye through the sclera at the margin of the optic disc; in the other it disappeared into the disc tissue near the disc margin.
Adult↗
Episodic exotropia from lateral rectus neuromyotonia--appearance and remission after radiation therapy for a thalamic glioma.
Sixteen months after radiation therapy for a moderately anaplastic astrocytoma of the thalamus, a 7-year-old boy developed spontaneous episodic contractions in his left lateral rectus muscle. During these episodes, lasting 10 to 30 seconds and occurring 20 or more times a day, he had exotropia, limitation of adduction, and retraction of the left globe. This phenomenon peaked in duration and frequency at 14 months and gradually disappeared after 22 months. As this case confirms, radiation injury to the abducens nerve can cause ocular neuromyotonia, resulting in episodic strabismus. Our case also illustrates that this condition can disappear completely after many months.
Abducens Nerve↗