Term
| What are two functions of the sclera? |
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Definition
Provides protection
Along with the cornea give the eye shape |
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Term
| What the two iris muscles? |
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Definition
The sphincter and the dilator muscles
One constricts and one dilates in relation to light entering the eye |
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Term
What is the power of the cornea?
N of the cornea? |
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Definition
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Term
| What are three characteristics of a healthy cornea? |
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Definition
Transparency
Avascular
Aspheric |
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Term
| What are the characteristics of rods & cones? |
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Definition
Rods contain Rhodopsin
responsible for low light vision and peripheral vision
Cones responsible for color vision and central vision |
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Term
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Definition
Area of distinct vision that surrounds the fovea centralis.
The fovea centralis is the area of our MOST distinct vision |
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Term
| N of the crystalline lens? Power? |
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Definition
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Term
| What are characteristics of a healthy lens? |
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Definition
Biconvex
Transparent
New layer every year
Bring light to focus on retina |
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Term
| What is the relationship between age and range of accomodation? |
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Definition
Inverse
The younger you are the more accommodation you receive |
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Term
| What are the details of the ciliary body? Parts? Functions? |
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Definition
Extension of the choroid at the end of the retina (ora serrata) to the base of iris
Consist of the ciliary processes which produces aqueous humor
Ciliary muscle which controls the process of accomodation
The muscle is connected to the lens by small ligaments called the zonules of zinn or suspensory ligaments |
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Term
| Explain the function of aqueous humor? N? Reason it exists? Drainage system? |
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Definition
Transparent liquid
maintains intraocular pressure
Provides nutrients in the form of amino acids and glucose to tissues that are avascular |
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Term
| What is the role of the optic disc? As well as the optic nerve? |
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Definition
| Optic disk is where optic nerve meets with the retina. There is no vision in this spot (scotoma) |
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Term
| Blood supply? How is the choroid involved? |
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Definition
| Choroid is the vascular coat of the eye. Supplies nutrients to the rest of the eye |
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