Biomedical subjects

D O'Duffy

Publications and source records attributed to D O'Duffy.

4 recordsLinked to original sources

PubMed1999

Siderosis bulbi resulting from an intralenticular foreign body.

PURPOSE: To report a case of siderosis bulbi that resulted from a small intralenticular foreign body. METHOD: Case report. RESULTS: A 36-year-old man with normal visual acuity and a peripheral intralenticular iron foreign body in the left eye was treated conservatively. Nine weeks after the injury, he had ocular signs of siderosis bulbi, with changes in the electroretinogram. A clear lens aspiration with removal of the foreign body was performed. After removal of the iron foreign body, no progression or regression of the ocular signs of siderosis bulbi has occurred, and the electroretinogram has not changed over a 2-year period. CONCLUSIONS: Even in the presence of good vision, a patient with an intralenticular ferrous foreign body should be followed closely, and the foreign body should be removed before irreversible siderosis bulbi occurs.

Adult↗

PubMed1998

Idiopathic intracranial hypertension presenting with gaze-evoked amaurosis.

PURPOSE: Gaze-evoked amaurosis is transient monocular visual loss induced by an eccentric position of gaze, most frequently associated with orbital mass lesions. To our knowledge, there has been no reported case of idiopathic intracranial hypertension as a cause of gaze-evoked amaurosis. We present the hypothesis that in an eccentric position of gaze, ischaemic compression of a tense dilated optic nerve sheath results in further elevation of intrasheath pressure compromising blood flow to the retina. METHOD: We describe a case of unilateral gaze-evoked amaurosis and headaches in a 46 year old man diagnosed with idiopathic intracranial hypertension. He did not respond to medical treatment and had optic nerve sheath decompressions. RESULT: Following surgery, this patient's visual function improved with resolution of his gaze-evoked amaurosis. CONCLUSION: Raised intracranial pressure associated with a tense dilated optic nerve sheath should be considered in the differential diagnosis of gaze-evoked amaurosis.

Blindness↗

PubMed1998

Can I drive after those drops, doctor?

PURPOSE: To document the experience of patients driving after drops to dilate the pupils. There are no documented guidelines on driving after pupillary dilatation. This is a study of patients who drove a car after attending the eye casualty for an ocular examination during which their pupils were dilated. METHODS: Thirty patients were identified who felt confident to drive after their pupils were dilated. Distant visual acuities, colour vision and confrontation visual fields were assessed before and after pupillary dilatation with 2.5% phenylephrine and 1% tropicamide. These patients met the legal requirements for driving after pupillary dilatation. The patients completed a questionnaire that recorded their subjective experiences of driving while their pupils were dilated. RESULTS: The mean age of the patients was 51.9 +/- 19.7 years (range 20-73 years). Twenty-seven of the 30 patients undertook the journey on familiar roads, and 14 of 30 wore spectacles. The mean spherical equivalent was +2.00 dioptre sphere for distance and a mean additional spherical equivalent of 1.75 dioptre sphere for near. Twenty patients experienced glare, which was severe enough to cause difficulty driving in three cases. Two of these patients drove in sunny weather conditions and one in light (not sunny) weather. Six patients had difficulty with road signs, two had difficulty judging distances and one reported difficulty with traffic lights. CONCLUSIONS: Dilating the pupils did not reduce distance visual acuity. However, it would seem appropriate to warn patients of the problems associated with glare and, if driving is their only option for transport home, recommend that they allow sufficient time to adapt to a dilated pupillary state, drive only on familiar roads and avoid driving in sunny weather.

Adult↗

PubMed1997

Wolfring dacryops and needling.

Cysts of the accessory lacrimal gland of Wolfring are uncommon in Europe; they are commoner in areas where trachoma is endemic and usually occur in eyes with some evidence of past trachomatous scarring (Bullock et al. 1986). The recommended mode of management is surgical, using an operating microscope, with an incision through the conjunctiva. Simple aspiration is inappropriate since the cyst refills. We describe a case of dacryops of the glands of Wolfring in a Caucasian male with no evidence of previous trachoma. This was managed with simple needling of the cyst. There was no recurrence of the cyst at 2 years follow-up.

Cysts↗