Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
|
Sclera |
White of the eye. Provides protective shell. Helps eye maintain shape. |
|
|
Conjunctiva |
Thin, mostly transparent tissue over sclera and inner parts of eye. Fights infection. |
|
|
Mucin |
Helps keep tears in place on the eye |
|
|
Cornea |
Front surface of eye. Transparent. Allows images to pass through. |
|
|
Iris |
Colored part of eye. |
|
|
Function of iris |
Regulates amount of light entering the eye. |
|
|
Pupil |
Opening in the center of the iris through which light enters the eye. |
|
|
What happens to iris muscles during nighttime/dark situations? |
They pull outward to create larger pupil, allows more light to enter. |
|
|
Lens |
Part of the focusing mechanism in the eye. Helps see distant and near objects. |
|
|
Zonules |
Small string like fibers tied to your focusing muscles |
|
|
At what age does the lens become less flexible? This causes what to happen? |
40, therefore reading glasses are necessary to do the work the lens cannot |
|
|
Vitreous |
Fluid inside the eye |
|
|
What is the role of the vitreous? |
Create a constant pressure inside the eye that helps maintain the eyes shape and holds tissues in place inside the eye. |
|
|
What is the vitreous mostly composed of? |
Water. |
|
|
Retina |
Light sensitive tissue lining the back of the eye. Light focuses on retina. |
|
|
Photoreceptors |
Light sensitive cells. Two kinds: rods and cones. |
|
|
Macula |
Central part of the retina. Used for fine detail viewing. |
|
|
Where is the macula located? |
Center of the back of the eye. Part of retina used when directly looking at something. |
|
|
Which part of the retina contains the most photoreceptor cells? |
Macula |
|
|
Optic nerve |
Information superhighway. Collects all the info from retina, bundles it together, and sends it to the brain for processing. |
|
|
What is responsible for everyone's small blind spot? |
Optic nerve because there are no retinal photoreceptors on the nerve. |
|
|
Image |
Light reflected from an object, passed through air, and into our eyes. |
|
|
If there is no light to shine on an object, does it form an image? |
No. An image requires light waves reflected from an object. |
|
|
An image is not visible unless what two conditions are met? |
1. The image is brought to a point of focus. 2. The image is brought to focus on a surface capable of capturing the image in a form that is instantly processed. |
|
|
What direction is a distant object received? |
Parallel to each other and perpendicular to imaging device. |
|
|
What direction are near objects received? |
Divergent, nonparallel to imaging system. |
