The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
Source Wikipedia-Iris (Anatomy)
The Mechanical iris is a mechanical model that replicates the change in shape of the Iris (Anatomy). It can be made using simple CNC or laser cut parts and assembled using fasteners.
1 sq feet – 3 mm Hylam
5 – M3 x 16 Bolts
15 – M3 x 12 Bolts
5 – M3 regular Nuts
20 – M3 Nylock Nuts
CNC Router or Laser Cutting machine
This instructable depicts the use of this mechanism as a locking system.