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Biomedical subjects

H K Tewari

Publications and source records attributed to H K Tewari.

At least 55 records · Page 3Linked to original sources
PubMed1991

Contrast sensitivity changes in background diabetic retinopathy.

Previous reports of contrast sensitivity in diabetic patients have shown conflicting results. We evaluated contrast sensitivity using Cambridge low-contrast sensitivity charts in 22 diabetic patients (22 eyes without retinopathy and 16 eyes with background retinopathy on fluorescein angiography) and 10 control subjects (20 eyes) matched for age and sex. The mean contrast threshold values at a spatial frequency of 4 cycles/degree were 0.46%, 0.60% and 0.43% in the three groups of eyes respectively. Contrast sensitivity was significantly lower in the diabetic eyes with retinopathy than in the normal eyes (p = 0.011) or the diabetic eyes without retinopathy (p = 0.033). This test may be of value in screening diabetic patients for retinopathy in primary care facilities.

Contrast Sensitivity↗
PubMed1990

Subretinal fluid in the diagnosis of posterior scleritis.

The etiology of subretinal mass lesions is very difficult to establish. A 28-year-old man presented to us with an area of choroiditis, which progressed, despite corticosteroid and antibiotic therapy, to an exudative retinal detachment, secondary glaucoma and a painful blind eye. To develop a means of identifying the cause of such lesions, we did a subretinal fluid tap prior to enucleation. Cytopathology showed only inflammatory cells and the final histopathological diagnosis was that of a granulomatous scleritis.

Adult↗
PubMed1989

Communicating intravitreal cysticercosis.

A viable intravitreal cysticercus cellulosae communicating with subretinal space was identified in a 45-year-old man. The cyst was removed in toto via the direct scleral approach without incident. To our knowledge this is the first report of intravitreal cysticercus with subretinal extension removed successfully by the direct route. The role of careful ultrasonic scanning in cases of intravitreal cysticercosis is emphasized.

Betamethasone↗
PubMed1987

Retinal toxicity of trace elements.

Acute toxicity of lead, nickel and cobalt on rabbit retina was studied. It was found that all these metals produced similar photoreceptor degenerative changes, but lead produced extensive degenerative changes at ganglion cell layer also. Electroretinographically nickel group showed statistically (by analysis of variance) significant prolongation of 'b' wave implicit time as seen in autosomal dominant retinitis pigmentosa.

Animals↗