Functions Of Choroid And Aging Changes In The Uvea

Question 1

Middle layer of the eye

Answer 1

Uvea

Question 2

Three regions of uvea

Answer 2

Iris
Ciliary body
Choroid

Question 3

Choroid extends from ______ to _______

Answer 3

Ora serata to optic nerve

Question 4

Choroid is located betwee the _____ and the ______

Answer 4

Sclera and retina

Question 5

What kind of choroid absorbs excess light

Answer 5

Darkly pigmented choroid

Question 6

This membrane of the choroid fuses with the retina multi laminated sheet

Answer 6

Bruchs membrane

Question 7

This type of choroid provides nutrients to and remove the waste products from outer retina

Answer 7

Vascular choroid

Question 8

Watershed layer of the retina

Answer 8

Outer plexiform layer

Question 9

What separates the outer retinal layer from the inner retinal layer

Answer 9

Outer plexiform layer

Question 10

Layers of the retina in the fovea

Answer 10

Area devoid of vessels

Question 11

What is the sole blood supply to the fovea avascular zone

Answer 11

Cchoriocapillaris

Question 12

Provides a pathway for the posterior vessels that supply the anterior segment

Answer 12

Suprachoroidal space of choroid

Question 13

________ nerve carries sensory and sympathetic fibers

Answer 13

Long ciliary nerve

Question 14

_____nerves carry sympathetic and parasympathetic fibers

Answer 14

Short ciliary nerves

Question 15

Choroid changes in emmetropization: hyperopia refocus

Answer 15

Thin choroid, growth increased
-can rapidly modulate its thickness, in so doing, varying the position of the retina and thus the state of focus of the eye

Question 16

Choroidal changes in emmetropization in myopic defocus

Answer 16

Thick choroid, growth decreased

Question 17

Functions of choroid

Answer 17

Provide nutrients and remove the waste products from outer retina

Passage of nerves and vessels

Absorption of excess light

Regulate emmetropization

Question 18

Aging changes in iris

Answer 18

Loss of pigmentation
Dilator muscle beceoms atrophic
Sphincter muscle becomes sclerotic

Difficult to dilate elderly

Question 19

Aqueous humor and age

Answer 19

Decreases, by 80, approximately 25% of what it was

Question 20

Aginging changes in choroid

Answer 20

• choroicapillaris decreases in density and diamter, then choroidal blood flow decreases
• bruchs membrane increases in thickness
• various substances and particles accumulates in bruchs membrane

Question 21

Nutrients from the choriocapillaris and waste produce from the retina must pass though

Answer 21

Bruchs membrane

Question 22

Layers of bruches membrane

Answer 22

1. Interrupted BM
2. Outer collagenous zone
3. Elastic layer
4. Inner collagenous zone
5. BM of RPE cels

Question 23

Calidification and the yellow deposits in the inner collagenous layer of Bruchs membrane. Made of the remaining cells (lipofuschin) from oxidative stress

Answer 23

Drusen

Question 24

Hello brown pigment granules composed of lipid containing residues from oxidativestress

Answer 24

Lipofuscin

Question 25

Accumulation of Drusen in Bruchs

Answer 25

Makes bruchs hydrophobic and presents a barrier to water movement, inhibiting the passing of metabolites -water accumulation between RPE and Bruch’s membrane cause detachment

Question 26

AMD causes

Answer 26

Age, genetics, lifestyle DRY -extensive soft confluent Drusen throughout the macula with subtle RPE drop out EARLY WET -acute subretinal blood in macular area with subtle sub-retinal fluid; choroidal neovascularization membrane (CNVM) is not clearly visualized LATE WET -subretinal blood, CNVM and sub retinal fibrosis with RPE atrophy in macular area

Question 27

Which layer is multilaminated sheet and fuses with RPE

Answer 27

Bruchs membrane

Question 28

Which one proves blood to fovea region

Answer 28

Choriocapillaris

Question 29

Which part of retina receives blood supply from choroid

Answer 29

Outer retina

Question 30

Which layer of choroid proves a pathway for the vessels and nerves that supply the anterior segment

Answer 30

Suprachoriudal space

Question 31

Which change to bruchs membrane with aging (thickness)

Answer 31

Increases

Question 32

Which layer of bruchs membrane does druse deposit

Answer 32

Inner collagenous zone