Safety activities may provide assurance of safety even where such assurance is unwarranted. This phenomenon – which we will call “probative blindness” – is evident both in hindsight analysis of accidents and in the daily practice of safety work. The purpose of this paper is to describe the phenomenon of probative blindness. We achieve this by distinguishing probative blindness from other phenom...

OBJECTIVE To assess the clinical and molecular genetic studies of patients with autosomal recessive retinitis pigmentosa associated with a mutation in the arrestin gene. DESIGN Results of molecular genetic screening and case reports with DNA analysis and clinical features. SETTING University medical center. PATIENTS One hundred twenty anamnestically unrelated patients with autosomal reces...

It was shown preciously that the physiological basis of congenital night blindness probably involves a defect in neural transmission affecting primarily the scotopic (rod) mechanism. However, spectral sensitivity measurements in the dark-adapted peripheral retina indicate that rod signals, although greatly attenuated, may reach cortical centers. In spite of the decreased sensitivity, measuremen...