UPDATE 6/20/24: I have released Version 1.1.5 to fix a small issue with the "Iris Line Opacity" value not changing.
Original description: Version 1.1 is here. You can now adjust the iris lines by changing its size, detail and more.
Suitable for use with both the Cycles & Eevee rendering engines. Free to use, edit or modify this .blend file. No credit required, but would be great if you do.
Promo image rendered with Blender 3.6's Eevee rendering engine, edited with GIMP (GNU Image Manipulation Program)