COA Exam Study (JCAHPO) Questions
and Answers (Already Graded A+)
levator palpebrae superioris - ANSWER-Muscle that elevates the lid
Sclera - ANSWER-white opaque fibrous shell, main purpose is to protect eye
Cornea - ANSWER-A transparent convex covering which protects the eye and helps
focus light rays onto the retina and the back of the eye
meibomian glands - ANSWER-The largest oil-secreting glands, which are embedded in
the posterior connective tissue substance of the lids
Corneal Epithelium - ANSWER-Part of the cornea that is usually injured by superficial
abrasions or small foreign bodies. Is 5-7 cells thick and is composed of nonkeratinized
stratified squamous cells.
Corneal Epithelium - ANSWER-Part of the cornea that regenerates rapidly and heals
without leaving a scar.
Bowman's membrane - ANSWER-Consists of randomly oriented collagen fibrils of
greater periodicity then the underlaying stroma.
Bowman's membrane - ANSWER-Acellular layer of cornea that has no regenerative
capabilities. Function is unclear.
Stroma - ANSWER-Layer just under Bowman's membrane. Accounts for 90% of corneal
thickness and is composed of 78% water.
Descemet's membrane - ANSWER-Layer of the cornea that is composed of type III
collagen, forms the basement membrane of epithelial cells.
Endothelium - ANSWER-4-6um thick layer of the cornea made of 500,000 cells that
maintains corneal deturgescence. No regenerative abilities.
Limbus - ANSWER-The gray, semitransparent area which demarcates the junction of
the cornea and sclera.
Cornea is completely nourished by - ANSWER-3 sources: A plexus of fine capillaries at
the limbus, the tear film, and the aqueous humor.
Vitreous - ANSWER-jelly like structure, thick and viscous, that occupies the vitreous
chamber in the posterior concavity of the globe.
and Answers (Already Graded A+)
levator palpebrae superioris - ANSWER-Muscle that elevates the lid
Sclera - ANSWER-white opaque fibrous shell, main purpose is to protect eye
Cornea - ANSWER-A transparent convex covering which protects the eye and helps
focus light rays onto the retina and the back of the eye
meibomian glands - ANSWER-The largest oil-secreting glands, which are embedded in
the posterior connective tissue substance of the lids
Corneal Epithelium - ANSWER-Part of the cornea that is usually injured by superficial
abrasions or small foreign bodies. Is 5-7 cells thick and is composed of nonkeratinized
stratified squamous cells.
Corneal Epithelium - ANSWER-Part of the cornea that regenerates rapidly and heals
without leaving a scar.
Bowman's membrane - ANSWER-Consists of randomly oriented collagen fibrils of
greater periodicity then the underlaying stroma.
Bowman's membrane - ANSWER-Acellular layer of cornea that has no regenerative
capabilities. Function is unclear.
Stroma - ANSWER-Layer just under Bowman's membrane. Accounts for 90% of corneal
thickness and is composed of 78% water.
Descemet's membrane - ANSWER-Layer of the cornea that is composed of type III
collagen, forms the basement membrane of epithelial cells.
Endothelium - ANSWER-4-6um thick layer of the cornea made of 500,000 cells that
maintains corneal deturgescence. No regenerative abilities.
Limbus - ANSWER-The gray, semitransparent area which demarcates the junction of
the cornea and sclera.
Cornea is completely nourished by - ANSWER-3 sources: A plexus of fine capillaries at
the limbus, the tear film, and the aqueous humor.
Vitreous - ANSWER-jelly like structure, thick and viscous, that occupies the vitreous
chamber in the posterior concavity of the globe.
