OPSC2111 - Eye Health Outcome 1
accompanied with complete questions
and correct answers
What are the 6 layers of the cornea? - Correct Answer: The six Layers
o epithelium
o Bowman's membrane
o stroma
o Dua's layer
o Descemet's membrane
o endothelium
What is the limbus? - Correct Answer: transitional zone between cornea and sclera
Define cornea - Correct Answer: The clear outer covering of the outer coat of the eyeball, forming the
covering of the aqueous chamber.
Epithelium - Correct Answer: Layer #1 of the cornea. Composed of 5-7 membrane sub layers off various
shapes of cells. It is the layer most likely to be injured by abrasions or small foreign bodies. Only layer
capable of rapid regeneration.
Bowman's Membrane - Correct Answer: Layer #2 of the cornea. Transitional layer to the stroma. Unable
to regenerate.
Stroma - Correct Answer: Layer #3 of the cornea. Provides approximately 90% of the cornea's total
thickness. Composed of tiny collagen fibrils called lamellae.
Dua - Correct Answer: Layer recently discovered between the Stroma and the Descemet's Membrane.
Only 15 microns thick, but incredibly strong. Composed primarily of collagen.
, Descemet's membrane - Correct Answer: Layer #4 of the cornea. Basement membrane that lies between
the corneal stroma and the endothelial layer of cornea. Provides rigidity to cornea. Capable of
regeneration if damaged. Thickens throughout life, doubling by age 40.
Endothelium - Correct Answer: Layer #5 of the cornea. Responsible for corneal dehydration control. Not
capable of regeneration. Failure to function leads to corneal edema. Made of hex shaped cell layers.
The Sclera - Correct Answer: The sclera is the first of the three layers which encapsulate the globe. The
sclera is the tough, semi-rigid "white of the eye," and it is what gives the eyeball its form. It allows for
attachment of extraocular muscle insertions, which are responsible for movements of the eye.
Three layers of the sclera - Correct Answer: Episclera, sclera proper, lamina fusca
Episclera - Correct Answer: The outer layer, is made of dense, fibrous and loosely connected strands of
connective tissue that connect with Tenon's capsule. It has many veins, arteries and capillaries, which
allow for inflammatory reactions consisting of swelling and congestion if infected.
Sclera Proper - Correct Answer: The second layer of tissue is the sclera itself, referred to as the sclera
proper. It not only has collagen fibrils, but also elastic fibers, which are arranged in a wicker-basket-
weave pattern.
Lamina Fusca - Correct Answer: A thin layer of pigmented connective tissue known as the lamina fusca is
the inner part of the sclera. The lamina fusca connects with the choroid.
Lamina Cribrosa - Correct Answer: A sieve-like perforation in the posterior part of the sclera, which
allows passage of the optic nerve bundle and central retinal vessels. The lamina cribrosa is the weakest
area of the sclera.
Tenons Capsule - Correct Answer: Also known as the fascia bulbi, Tenon's capsule acts as a barrier to
prevent the spread of orbital infection into the globe.
Conjunctiva - Correct Answer: The conjunctiva is a transparent mucous membrane that extends from
the limbus at the edge of the cornea over the entire anterior sclera. It continues, forming what is
accompanied with complete questions
and correct answers
What are the 6 layers of the cornea? - Correct Answer: The six Layers
o epithelium
o Bowman's membrane
o stroma
o Dua's layer
o Descemet's membrane
o endothelium
What is the limbus? - Correct Answer: transitional zone between cornea and sclera
Define cornea - Correct Answer: The clear outer covering of the outer coat of the eyeball, forming the
covering of the aqueous chamber.
Epithelium - Correct Answer: Layer #1 of the cornea. Composed of 5-7 membrane sub layers off various
shapes of cells. It is the layer most likely to be injured by abrasions or small foreign bodies. Only layer
capable of rapid regeneration.
Bowman's Membrane - Correct Answer: Layer #2 of the cornea. Transitional layer to the stroma. Unable
to regenerate.
Stroma - Correct Answer: Layer #3 of the cornea. Provides approximately 90% of the cornea's total
thickness. Composed of tiny collagen fibrils called lamellae.
Dua - Correct Answer: Layer recently discovered between the Stroma and the Descemet's Membrane.
Only 15 microns thick, but incredibly strong. Composed primarily of collagen.
, Descemet's membrane - Correct Answer: Layer #4 of the cornea. Basement membrane that lies between
the corneal stroma and the endothelial layer of cornea. Provides rigidity to cornea. Capable of
regeneration if damaged. Thickens throughout life, doubling by age 40.
Endothelium - Correct Answer: Layer #5 of the cornea. Responsible for corneal dehydration control. Not
capable of regeneration. Failure to function leads to corneal edema. Made of hex shaped cell layers.
The Sclera - Correct Answer: The sclera is the first of the three layers which encapsulate the globe. The
sclera is the tough, semi-rigid "white of the eye," and it is what gives the eyeball its form. It allows for
attachment of extraocular muscle insertions, which are responsible for movements of the eye.
Three layers of the sclera - Correct Answer: Episclera, sclera proper, lamina fusca
Episclera - Correct Answer: The outer layer, is made of dense, fibrous and loosely connected strands of
connective tissue that connect with Tenon's capsule. It has many veins, arteries and capillaries, which
allow for inflammatory reactions consisting of swelling and congestion if infected.
Sclera Proper - Correct Answer: The second layer of tissue is the sclera itself, referred to as the sclera
proper. It not only has collagen fibrils, but also elastic fibers, which are arranged in a wicker-basket-
weave pattern.
Lamina Fusca - Correct Answer: A thin layer of pigmented connective tissue known as the lamina fusca is
the inner part of the sclera. The lamina fusca connects with the choroid.
Lamina Cribrosa - Correct Answer: A sieve-like perforation in the posterior part of the sclera, which
allows passage of the optic nerve bundle and central retinal vessels. The lamina cribrosa is the weakest
area of the sclera.
Tenons Capsule - Correct Answer: Also known as the fascia bulbi, Tenon's capsule acts as a barrier to
prevent the spread of orbital infection into the globe.
Conjunctiva - Correct Answer: The conjunctiva is a transparent mucous membrane that extends from
the limbus at the edge of the cornea over the entire anterior sclera. It continues, forming what is
