Which structure functions as the supporting wall of the eyeball, maintaining shape?

Which structure functions as the supporting wall of the eyeball, maintaining shape?

• A. Retina
• B. Cornea
• C. Iris
• D. Sclera

Answer: (D)

The wall that gives the eyeball its shape is the sclera, the tough white outer coat. It forms most of the eyeball’s protective outer layer and provides the rigidity needed to keep the eye spherical. It also serves as an attachment site for the extraocular muscles that move the eye. The other structures have different roles: the retina is the light-sensitive inner layer, the cornea is the transparent front window that helps focus light, and the iris controls how much light enters through the pupil. None of these primarily function to maintain the overall shape of the eyeball like the sclera does.

The wall that gives the eyeball its shape is the sclera, the tough white outer coat. It forms most of the eyeball’s protective outer layer and provides the rigidity needed to keep the eye spherical. It also serves as an attachment site for the extraocular muscles that move the eye.

The other structures have different roles: the retina is the light-sensitive inner layer, the cornea is the transparent front window that helps focus light, and the iris controls how much light enters through the pupil. None of these primarily function to maintain the overall shape of the eyeball like the sclera does.