| Question |
Answer |
| What are the 8 components of the external structure of the eye? |
|
Eyelids, eyebrows, eyelashes, lacrimal system, conjunctiva, cornea, sclera, and extraocular muscles.
|
| What are the 5 internal structures of the eye? |
|
Iris, lens, ciliary body, choroid and retina.
|
| Where does the visual information refracted onto the retina get processed as an image? |
|
The occipital cortex
|
| What makes up the outer layer of the eyeball? |
|
The sclera and the cornea
|
| What is the middle layer of the eyeball called and what is in it? |
|
It is the uveal tract and is made up of the iris, choroid body and ciliary body.
|
| What makes up the innermost layer of the eyeball? |
|
The retina
|
| Where is the anterior chamber of the eyeball located? |
|
Between the iris and the posterior surface of the cornea.
|
| Where is the posterior chamber of the eyeball located? |
|
Between the anterior surface of the lens and the posterior surface of the iris
|
| What does the anterior and posterior chambers of the eyeball contain? |
|
Aqueous humor secreted by the ciliary body
|
| Where is the vitreous cavity located? |
|
Behind the lens and retina
|
|
|
| What structures does light pass through in order to reach the retina? |
|
The cornea, aqueous humor, lens and vitreous.
|
| What structure of the eye is most responsible for the majority of light refraction needed for clear vision? |
|
The cornea
|
| What is the function of aqueous humor? |
|
It bathes and nourishes the lens and endothelium of the cornea.
|
| What is glaucoma? |
|
Excess production or decreased outflow of aqueous humor that increases the intraocular pressure above normal (10 mm-21 Hg).
|
| What structures support the ocular lens and keep it in place? |
|
Zonules
|
| What is the function of the ocular lens? |
|
To bend light rays, allowing them to fall on the retina.
|
| Accommodation, a process that allows a person to focus on near objects, is possible through modification of the lens shape. The ________ are the structures that make this occur. |
|
Zonules
|
| Vitreous becomes more ___________ with aging. |
|
Liquid (it is normally a gelatinous substance)
|
| Light passing through the vitreous may be blocked by any ___________ within the vitreous. |
|
Nontransparent substance
|
| __________ is the ability of the eye to bend light rays so they fall on the retina. |
|
Refraction
|
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