What is the function of the optic disk?

The optic disk serves a crucial role in the visual system by creating a blind spot, which occurs because it lacks photoreceptor cells, such as rods and cones. This area is where the optic nerve exits the eye and proceeds to the brain, meaning there are no light-sensitive cells present to detect images in that location. When light falls on the optic disk, it cannot be perceived, resulting in a small gap in the field of vision.

While the other options relate to aspects of ocular function, they do not accurately describe the specific role of the optic disk. The optic disk does not focus light onto the retina; instead, it is part of the pathway that transmits visual information from the retina to the brain. It does not produce aqueous humor, which is generated by the ciliary body, nor does it support the lens, as that function is carried out by the ciliary muscles and zonules. Thus, the role of the optic disk in creating a blind spot is essential to understanding its significance in the anatomy and functioning of the eye.