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Optical Quz Feb 8th 2022 Brian Thomas Anatomy of the eye
Practice Quiz
13
Other
Not Applicable
02/07/2022

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Cards

Term
What are two functions of the sclera?
Definition
Provides protection

Along with the cornea give the eye shape
Term
What the two iris muscles?
Definition
The sphincter and the dilator muscles

One constricts and one dilates in relation to light entering the eye
Term
What is the power of the cornea?

N of the cornea?
Definition
+45D

N = 1.376
Term
What are three characteristics of a healthy cornea?
Definition
Transparency
Avascular
Aspheric
Term
What are the characteristics of rods & cones?
Definition
Rods contain Rhodopsin

responsible for low light vision and peripheral vision

Cones responsible for color vision and central vision
Term
What is the macula?
Definition
Area of distinct vision that surrounds the fovea centralis.

The fovea centralis is the area of our MOST distinct vision
Term
N of the crystalline lens? Power?
Definition
N = 1.42

+15 power
Term
What are characteristics of a healthy lens?
Definition
Biconvex
Transparent
New layer every year
Bring light to focus on retina
Term
What is the relationship between age and range of accomodation?
Definition
Inverse

The younger you are the more accommodation you receive
Term
What are the details of the ciliary body? Parts? Functions?
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
Term
Explain the function of aqueous humor? N? Reason it exists? Drainage system?
Definition
Transparent liquid
maintains intraocular pressure
Provides nutrients in the form of amino acids and glucose to tissues that are avascular
Term
What is the role of the optic disc? As well as the optic nerve?
Definition
Optic disk is where optic nerve meets with the retina. There is no vision in this spot (scotoma)
Term
Blood supply? How is the choroid involved?
Definition
Choroid is the vascular coat of the eye. Supplies nutrients to the rest of the eye
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