Biomedical subjects
Publications and source records attributed to F A Billson.
A decision needle suitable for use in cataractous microphthalmic eyes and the principles governing its design are described. It enables extensive microsurgery of the lens capsule to be performed, with minimal loss of aqueous.
A surgical technique for optic nerve decompression in children is described and contrasted with other techniques described in the literature. The operation was effective in relieving long-standing disc oedema in two cases in which the swelling was due to raised intracranial pressure. Photographic evidence is presented. The indications for surgery and how its effect is exerted are discussed.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
In recent years, the ophthalmic examination of infants has been of increasing interest to both clinicians and vision researchers. Clinicians have documented a greater risk of retinopathy, strabismus and amblyopia in premature infants, especially those of low birthweight. In addition to the external and retinal examination of the infant eye, a number of clinical tests can help the ophthalmologist to detect visual dysfunction through the evaluation of pupillary responses and ocular motility. Recently, the development of objective techniques (optokinetic nystagmus, forced choice preferential looking, and visually evoked potentials) have not only aided in the detection of ophthalmic disorders in infants; they have contributed to useful definitions of "normal" vision at various ages and to the understanding of factors that influence the pre- and post-gestational development of visual function.
A case of buphthalmos and regional giantism in neurofibromatosis with the characteristics of the Francois syndrome is reported. Difficulties of early diagnosis are emphasized. A discussion of the mechanisms which may produce buphthalmos in neurofibromatosis is presented. We propose that buphthalmos in neurofibromatosis may be primarily an expression of regional giantism rather than a consequence of uncontrolled intraocular pressure.
A case of an isolated unilateral horizontal gaze paralysis is presented. The abnormality has remained static and in isolation for more than three years. A review of the benign causes of pontine gaze palsies is presented. The unique features of this case is the fact that the gaze paralysis is unilateral and unassociated with any other neurologic or systemic abnormality.
Management of intralenticular foreign bodies (ILFBs) is controversial. Correlation between visual outcome, foreign body characteristics, the need for surgical intervention, and the choice of surgical technique are not well established. We report five cases of traumatic ILFBs all managed surgically. Three ILFBs were metal, one was presumably also metal, and one was wood. We chose to proceed with foreign body removal and simultaneous cataract extraction with intraocular lens implantation as a single-staged procedure in four cases. In one case of planned extracapsular cataract extraction, a foreign body was identified only after the expressed nucleus was sent for pathological examination. Visual outcomes were 20/30 or greater in all cases at 5 to 18 month follow up.
A case of optic nerve hypoplasia in the Conradi-Hunermann form of chondrodysplasia punctata is reported. This is the first published report of such a case. The authors suggest that optic nerve hypoplasia in chondrodysplasia punctata may be the significant lesion of the optic nerve rather than atrophy as has been previously reported.
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