What Is Progressive Multifocal Leukoencephalopathy? Progressive multifocal leukoencephalopathy (PML) is a rare and serious infection that attacks part of your brain. You can get it when your body ...

A multifocal metalens, which focuses incident light at multiple foci, has many applications in imaging systems and optical communications. However, the traditional design strategy of a multifocal ...

Children wearing multifocal contact lenses had slower progression of their myopia, according to new results. The findings support an option for controlling the condition, also called nearsightedness, ...

Have you noticed that more children than ever are wearing glasses? Global research indicates 35% of children are affected by myopia, needing glasses to see clearly at a distance. If the trend ...