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Biomedical subjects

H S Thompson

Publications and source records attributed to H S Thompson.

At least 91 records · Page 5Linked to original sources
PubMed1984

Visual function abnormalities in central serous retinopathy.

Eighteen patients with central serous retinopathy (CSR) underwent a battery of visual function tests when first seen and after resolution of the subretinal fluid. Eyes with CSR had minimal relative afferent pupillary defects, reduced critical flicker-fusion thresholds, prolonged visual evoked potential (VEP) latencies, increased errors on the Farnsworth-Munsell 100-hue (FM 100) test, and depressed central visual fields (Octopus). The afferent pupillary defect and critical flicker-fusion thresholds were the first to improve after resolution of the subretinal fluid. Next in rate of improvement were the visual acuity, the VEP latency, and the FM 100 test results. The threshold of the central Octopus at fixation improved the slowest and was still abnormal during long-term follow-up, indicating a prolonged depression in the threshold of central field sensitivity after resolution of the CSR. Many of these abnormalities are also seen in patients with optic nerve disease.

Adult↗
PubMed1984

Light-near dissociation of the pupil.

A careful examination of the near response of the pupil should be part of the routine eye examination, and the clinician should have a few tricks up his sleeve for the patient who does not like to look at a near object. When the near response of the pupil is greater than the light response, there is a limited, but interesting and important differential diagnosis to be considered.

Accommodation, Ocular↗
PubMed1983

Functional visual loss. Follow-up of 42 cases.

Forty-two patients with diagnosed functional visual loss were reexamined an average of four years after their initial visit. Twenty-three patients continued to have constricted or spiral visual fields at follow-up. Despite persistent evidence of functional visual defects, few patients were either socially or economically impaired by them. Patients who had other types of visual field loss or loss of visual acuity were more likely to have these signs resolve than were patients with constricted or spiral fields. Concurrent unrelated organic ocular disease was present in 11 patients. In 20 patients, it was not possible to identify psychiatric symptoms either related to the onset of functional eye signs or at follow-up. Treatment did not substantially alter the course.

Adolescent↗
PubMed1983

Nomograms for the assessment of Farnsworth-Munsell 100-hue test scores.

Although the Farnsworth-Munsell 100-hue test is a sensitive means of evaluating congenital and acquired color vision deficiencies, using the data it provides involves complex calculations. We have developed two nomograms that permit the clinician to determine quickly and easily whether a given score is normal for the patient's age and whether the difference between fellow eyes is within the normal range.

Adult↗
PubMed1983

Pupillary defects in amblyopia.

We examined the pupils of 55 amblyopic subjects to determine whether a pupillary defect could be detected in the amblyopic eye. We found relative afferent pupillary defects in 45 of the subjects; these defects were equal to or larger than 0.3 log unit (that is, easily visible) in 29 subjects. The pupillary defect was always in the amblyopic eye, but it could not be correlated with the severity or the cause of the amblyopia, with visual-evoked potential abnormalities, or with color vision defects.

Adolescent↗
PubMed1983

Tadpole-shaped pupils caused by segmental spasm of the iris dilator muscle.

Segmental spasms of the iris dilator muscle produce intermittent pupillary distortion. A study of 26 case histories (six previously reported and 19 reported for the first time) showed that the episodes are brief (lasting less than five minutes in 23 of 26 patients, less than two minutes in 18 patients, and less than one minute in eight patients) but can occur several times a day. The patients ranged in age from 24 to 48 years (the age of one patient was not known); five were men and 21 were women. Eleven patients had Horner's syndrome, four had Adie's tonic pupil, and eight had definite or probable migraine (another three had possible migraine). The episodes eventually stopped, leaving no serious sequelae. Focal application of phenylephrine produced a similar distortion in a normal human eye.

Adult↗
PubMed1982

Visual loss in pseudotumor cerebri. Follow-up of 57 patients from five to 41 years and a profile of 14 patients with permanent severe visual loss.

The prognosis for vision in most patients with pseudotumor cerebri is excellent; however, visual loss, which is the only serious complication, may occur either early or late in the course of the disease. A group of 57 patients was followed up five to 41 years with visual fields, visual acuity, and fundus photographs. Blinding visual loss or severe visual impairment in one or both eyes occurred in 14 patients, and in seven patients, this occurred months to years after the initial symptoms. Systemic hypertension was a significant risk factor for visual loss in patients with pseudotumor cerebri, and blindness occurred in eight of 13 patients who were hypertensive. Despite suggestions that blind spot measurement is useful for following up patients with this condition, we believe that sequential quantitative perimetry gives more complete information and is essential to rational decision making in the treatment of pseudotumor cerebri.

Adolescent↗
PubMed1982

Visual evoked potential and pupillary signs. A comparison in optic nerve disease.

We measured the pupil cycle time, the relative afferent pupillary defect, and the pattern-reversal visual evoked potential (VEP) in 41 patients with unilateral anterior ischemic optic neuropathy (AION) and 24 patients with unilateral optic neuritis. We speculated that the relative afferent pupillary defect would match the VEP amplitude and that the pupil cycle time would correspond to the VEP latency. We found a correlation between the relative afferent pupillary defect and VEP amplitude in patients with AION, but not in patients with optic neuritis. We also found that the pupil cycle time and VEP latency were weakly correlated, but only in patients with optic neuritis. In these two groups of patients with unilateral optic neuropathy, the most sensitive objective indicator of disease was the relative afferent pupillary defect. The least sensitive indicator was the pupil cycle time.

Aged↗
PubMed1982

The diagnosis and prognosis of atypical carotid-cavernous fistula (red-eyed shunt syndrome).

Nineteen patients who complained of red eyes had the characteristic clinical signs of an atypical carotid-cavernous fistula. Episcleral veins were dilated, intraocular pressure and episcleral venous pressure were high, and blood filled Schlemm's canal during gonioscopy. Most of the patients had mild exophthalmos, but in none was the exophthalmos obviously pulsatile, and in only two patients could a bruit be heard. Orbital echography disclosed either a dilated superior ophthalmic vein or congestion of the orbital soft tissues. Selective carotid angiography, done in seven patients, disclosed the fistula to be a dural-cavernous fistula. The serious complication of the fistulas was open-angle glaucoma resulting from the high episcleral venous pressure. None of the fistulas was treated surgically, but six closed spontaneously and three closed soon after carotid angiography.

Adolescent↗