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Memorias del Instituto de Investigaciones en Ciencias de la Salud

On-line version ISSN 1812-9528


GUERRERO HERNANDEZ, Amanda Cristina et al. Prevalence of Toxoplasma retinochoroidal scars in a Paraguayan population. Mem. Inst. Investig. Cienc. Salud [online]. 2016, vol.14, n.1, pp.78-85. ISSN 1812-9528.

The objective of this study was to determine the prevalence of retinal scars caused by toxoplasmosis in an adult population from the municipality of San Francisco de Atyra in Paraguay. The population of this town was examined from July, 2013 to March 2014. Sixty families, randomly selected, participated voluntarily and within each of them a member older than 18 years of age also selected randomly. Visual acuity was measured using the Snellen chart in each eye separately at 6 meters from the patient, as well as the automated refraction, refraction test, biomicroscopy with a slit lamp with emphasis in the depth of the anterior chamber. Patients with panda or narrow front chambers (use of a mini 4 mirror gonioscope) were discarded. Intraocular pressure, instillation of tropicamide 0.5%/phenylephrine HCl 5% in each eye, evaluation of the posterior pole in a slit lamp with 90D Superfield lens, indirect ophtalmoscopy with 20D lenses and photography with non-mydriatic camera were also carried out. The diagnosis of ocular toxoplasmosis was based in clinical criteria and aspects of the lesion scar by retinochoroiditis. Sixty one patients were evaluated ophtalmologically and six were excluded. The prevalence of chorioretinal scars was 9.1% being more frequent in men without age predominance or ocular laterality, with visual acuity equal to or better than 20/40 with its best correction.

Keywords : retinal scars by toxoplasmosis; prevalence; San Francisco de Atyra.

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