Vocabulary

2. Nerve either part of sensory nerves that comprises the second pair of cranial nerves.
6. the sensory membrane that lines most of the large posterior chamber of the vertebrate eye and functions as the immediate instrument of vision.
8. the opening in the iris,which admits lights into the interior of the vertebrate eye
10. the opague muscular contractile diaphragm that is suspended in the aqueous humor
12. any of the conical photosensitive receptir cells of the vertebrate retina that function in color vision.
13. the automatic adjustment of the eye for seeing at different distances
14. a defect of an optical system causing rays from a point to fail to meet in a focal point resulting in a blurred an imperfect image
15. a condition in which visual images come to a focus behind the retina of the eye and vision is better for distant than for near objects---also called farsightedness

1. any of the long rod-shaped photosensitive receptors in the retina responsive to faint light
3. the transparent part of the coat of the eyeball.
4. the ability to judge the distance of objects and the spatial relationship of objects at different distances.
5. a curved peice of glass or plastic
7. the small circular area in the retina
9. a condition in which the visual images come to a focus infront of the eye
11. the deflection from a straight path undergone by a light rat or a wave of energy