Well, I know how to build a retina scanner if you ever need one :)

But an iris scanner is probably easier. Just keep in mind that both Iris and Retina do slightly change over a long lifespan.

If everything you have is tied to having access to your eyes you might lose everything on a simple cataract surgery.

Passkeys to the Rescue

Are silent keyboards a thing? Seems like the most straightforward countermeasure.