| Term | Definition |
| Lens | Focuses an image onto the eye's retina. |
| Pupil | When dark this is large to let more light in, but when bright it is small to let in less light. |
| Retina | This part of the eye captures the image, like film in a camera. |
| Optic Nerve | This sends the captured image off to the brain. |
| Ciliary Muscles | These change the shape of the lens to allow us to focus on objects. |
| Vitreous humour | The inside of the eye is filled with this black, jelly like substance. |
| Conjunctiva | What is the name given to the clear covering off the eye? |
| Iris | This is a coloured ring of muscle that changes the size of the pupil, and therefore, changes the amount of light that enters the eye. |
| Cornea | This is underneath the conjunctiva and is a clear window that allows light to enter the eye. |
| Aqueous humour | The space between the cornea and the lens is filled with a watery liquid called what? |
| Blind Spot | This is the part of the retina where the optic nerve begins...sometimes things disappear? |