Vision Disorders

The choroid is the layer of cells over which the retina lies. Inflammation of this layer is visible through the retina and manifests as rapid onset of blurred vision—usually only in one eye—and haziness and spots over the entire field of vision. It may be caused by a parasitic protozoan infection in the bloodstream; larvae of dog tapeworms (the eggs of which may be accidentally ingested through contact with dog feces); a seriously compromised immune system—from AIDS, for example; a fungus infection called Histoplasmosis; or syphilis passed on to unborn babies.