The Lenses app was specially designed for Windows Phone 8.1 which is a Camera application work without camera roll. A few months ago, Microsoft has removed this app from Windows 10 Mobile, but there is a good news that today the Lenses app returned with a new update named Windows Camera which redesigned Camera app for Windows 10, faster and simpler than ever before.
Download Windows Camera app for Windows 10
To access this new Windows Camera app, you need to upgrade Windows 10 and then update Windows Store app to the newest version. This app works on both Windows 10 mobile devices and Desktop PCs.