Security News > 2022 > September > Leaking Screen Information on Zoom Calls through Reflections in Eyeglasses
Being able to read reflected headline-size text isn't quite the privacy and security problem of being able to read smaller 9 to 12 pt fonts.
"We found future 4k cameras will be able to peek at most header texts on almost all websites and some text documents," said Long.
A variety of factors can affect the legibility of text reflected in a video conference participant's glasses.
These include reflectance based on the meeting participant's skin color, environmental light intensity, screen brightness, the contrast of the text with the webpage or application background, and the characteristics of eyeglass lenses.
Not every glasses-wearing person will necessarily provide adversaries with reflected screen sharing.
With regard to potential mitigations, the boffins say that Zoom already provides a video filter in its Background and Effects settings menu that consists of reflection-blocking opaque cartoon glasses.