Virtual hadronic and leptonic contributions to Bhabha scattering.

Using dispersion relations, we derive the complete virtual QED contributions to Bhabha scattering due to vacuum polarization effects. We apply our result to hadronic corrections and to heavy lepton and top quark loop insertions. We give the first complete estimate of their net numerical effects for both small and large angle scattering at typical beam energies of meson factories, the CERN Large Electron-Positron Collider, and the International Linear Collider.

[Ocular manifestations of myotonia atrophica].

In a 55-year-old male with a history of over 20 years of exposure to lead clinical, electromyographic and histological investigations demonstrated myotonic dystrophy. Cataract and high-grade concentric narrowing of the visual field were found bilaterally. The latter change has been reported sporadically in this disease.

The significance of fluorescein angiography in the early diagnosis of lesions on ocular fundus at pseudoxanthoma elasticum patients.

The role of fluorescein angiography in early diagnosis of lesions on fundus of the eye at pseudoxanthoma elasticum patients has been shown. The authors show angiographic changes on the basis of three cases of pseudoxanthoma elasticum patients.

[Retinal changes in subacute sclerosing panencephalitis].

In a 12-year-old boy with histologically confirmed subacute sclerosing panencephalitis changes resembling chorioretinitis were found in the peripheral part of the left retina. Fluorescein angiography demonstrated signs of atrophy of pigmented epithelium. On the basis of pertinent literature the authors suggest that in this disease retinal involvement may precede neurological manifestations.