https://www.cnet.com/news/galaxy-s9-better-iris-scanner-report/

Samsung will reportedly bring several upgrades to the iris scanner on its next Galaxy S phone, presumably called the Galaxy S9. Some of these possible changes include a shorter response time, better recognition in dark or bright environments or when the user is wearing glasses, and a slightly higher resolution, 3-megapixel lens (up from 2MP in the Galaxy S8) according to The Korea Herald.

More secure biometric authentication -- like fingerprint sensing, iris scanning and facial recognition -- is always a good thing, but the update may seem especially necessary after hackers were able to fool the iris scanner on the Galaxy S8 using a photo and contact lenses. After the hack Samsung was quick to defend the security of its iris-scanning tech, but an improved scanner may help those concerned rest more easily.