OcularDisease 2 First quiz

crystalline lens

also called the lens

1. biconvex

2. relatively acellular

3. optically transparent

4. suspended behind the iris

5. transmits light to the retina

5 properties of the lens

1. collagen

2. proteins

3. elongated cells

3 compositions of the crystalline lens

none

blood supply of crystalline lens

aqueous humor

removes waste products of the crystalline lens

aqueous humor

gives nutrients to the crystalline lens

accommodation

the relaxation and contraction of the ciliary muscles

accommodation

changes the focal distance to the retina and bringing the image into sharp focus

zonular fibers or suspensory ligaments

attaches the lens to the ciliary body

flatter on Anterior side compared to its Posterior side

the lens is flatter on its blank side compared to its blank side

1. capsule

2. epithelium

3. cortex

4. nucleus

4 structures of the crystalline lens

cataract

a dense cloudiness that forms in the normally crystal clear ocular lens

metabolism & movement in nutrients

cataract develops because of changes in blank and blank

1. degenerative

2. congenital

3. infection

4. radiation

5. drugs

6. trauma

7. diabetes mellitus

7 causes of cataract

degenerative senile cataract

an age related vision impairing condition characterized by gradual clouding and thickening of the lens

degenerative senile cataract

the world's leading cause of treatable blindness

degenerative senile cataract

the most common type of cataract

history of gradual visual deterioration

&

disturbance at night and near vision

a patient with senile cataract often presents with

glare

halos or streaks around lights, difficulty seeing in the presence of bright lights

poor contrast sensitivity

decrease in contrast sensitivity in brightly lit environments

myopic shift

the progression of cataracts frequently increases anteroposterior axis, resulting in a mild or moderate degree of increased myopia

monocular diplopia

the so called "lens within a lens" phenomenon

1. NOT a visible film outside of the eye

2. NOT caused from eye overuse

3. generally does NOT cause irritation or pain

3 common misconceptions of cataract

1. decreased visual acuity

2. glare

3. poor contrast sensitivity

4. poor ability to discern colors

5. myopic shift

6. monocular diplopia

6 characteristics symptoms

pathophysiology of cataract

proteins in the eye form clumps that prevents lens from sending clear images to the retina

decreased visual acuity

the most common complaints of patients with senile cataract

decreased visual acuity

difficulty seeing in low light situations (including poor night vision)

common senile cataract OR age related cataract

degenerative cataract is either

monocular diplopia

the nuclear changes are concentrated in the inner layers of the lens, resulting in a refractile area in the center of the lens

monocular diplopia

not correctable with spectacles, prisms, and contact lenses