In the visual system, the major purpose of the iris of the eye is to

The major purpose of the iris in the eye in terms of the visual system is focusing the light on the retina as the iris is responsible of managing the light passing or reaching in the retina of the eyes.

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.