Researchers at the Chinese University of Hong Kong found that children exposed to secondhand smoke had a significantly thinner choroid, or dense network of blood vessels, than unexposed children.

CRISPR is a new kind of genetic engineering that allows scientists to edit DNA to potentially repair genetic defects or use genetically modified human cells as therapies. Ophthalmologists are not yet using CRISPR to treat eye diseases. But scientists hope it could one day st…