| A | B |
|---|
| retina | contains millions of photoreceptors |
| pupil | rounded opening through which light passes |
| iris | circularly and radially arranged pigmented smooth muscle fibers |
| lens | flexible biconvex crystal like structure |
| ciliary body | smooth muscle structures |
| choroid | blood rich tunic that contains dark pigment |
| sclera | white of eye |
| lacrimal canals | absorb tears that flush across the eyeball |
| fovea centralis | area of sharpest vision |
| pinkeye | infection of the conjuctiva of the eye |
