Intro | Cornea | Optic Disk and Blind Spot | Fovea | Iris | Lens | Muscles (to move eye) | Muscles (to adjust lens) | Optic Nerve | Pupil | Retina
Part 1: Image-Mapped Tutorial
Part 2: Matching Self-Test
Part 3: Multiple-Choice Self-Test
Optic disk and blind spot: The axons of the receptor cells of the retina collect in a single spot before they exit the back of the eye through a hole called the optic disk. Since no receptor cells are located in this hole, a blind spot exists in the representation of the external world. Because each eye compensates for the blind spot of the opposite eye, we are not usually aware of it.