COA exam study (JCAHPO) 2026
Questions and Answers
levator palpebrae superioris - Correct answer-Muscle that elevates the lid
Sclera - Correct answer-white opaque fibrous shell, main purpose is to protect eye
Cornea - Correct 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 - Correct answer-The largest oil-secreting glands, which are
embedded in the posterior connective tissue substance of the lids
Corneal Epithelium - Correct 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 - Correct answer-Part of the cornea that regenerates rapidly
and heals without leaving a scar.
Bowman's membrane - Correct answer-Consists of randomly oriented collagen
fibrils of greater periodicity then the underlaying stroma.
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, Bowman's membrane - Correct answer-Acellular layer of cornea that has no
regenerative capabilities. Function is unclear.
Stroma - Correct answer-Layer just under Bowman's membrane. Accounts for 90%
of corneal thickness and is composed of 78% water.
Descemet's membrane - Correct answer-Layer of the cornea that is composed of
type III collagen, forms the basement membrane of epithelial cells.
Endothelium - Correct answer-4-6um thick layer of the cornea made of 500,000
cells that maintains corneal deturgescence. No regenerative abilities.
Limbus - Correct answer-The gray, semitransparent area which demarcates the
junction of the cornea and sclera.
Cornea is completely nourished by - Correct answer-3 sources: A plexus of fine
capillaries at the limbus, the tear film, and the aqueous humor.
Vitreous - Correct answer-jelly like structure, thick and viscous, that occupies the
vitreous chamber in the posterior concavity of the globe.
Lens - Correct answer-A transparent biconvex structure situated between the iris
and the vitreous.
Iris - Correct answer-The most anterior structure of the uveal tract.
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Questions and Answers
levator palpebrae superioris - Correct answer-Muscle that elevates the lid
Sclera - Correct answer-white opaque fibrous shell, main purpose is to protect eye
Cornea - Correct 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 - Correct answer-The largest oil-secreting glands, which are
embedded in the posterior connective tissue substance of the lids
Corneal Epithelium - Correct 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 - Correct answer-Part of the cornea that regenerates rapidly
and heals without leaving a scar.
Bowman's membrane - Correct answer-Consists of randomly oriented collagen
fibrils of greater periodicity then the underlaying stroma.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, Bowman's membrane - Correct answer-Acellular layer of cornea that has no
regenerative capabilities. Function is unclear.
Stroma - Correct answer-Layer just under Bowman's membrane. Accounts for 90%
of corneal thickness and is composed of 78% water.
Descemet's membrane - Correct answer-Layer of the cornea that is composed of
type III collagen, forms the basement membrane of epithelial cells.
Endothelium - Correct answer-4-6um thick layer of the cornea made of 500,000
cells that maintains corneal deturgescence. No regenerative abilities.
Limbus - Correct answer-The gray, semitransparent area which demarcates the
junction of the cornea and sclera.
Cornea is completely nourished by - Correct answer-3 sources: A plexus of fine
capillaries at the limbus, the tear film, and the aqueous humor.
Vitreous - Correct answer-jelly like structure, thick and viscous, that occupies the
vitreous chamber in the posterior concavity of the globe.
Lens - Correct answer-A transparent biconvex structure situated between the iris
and the vitreous.
Iris - Correct answer-The most anterior structure of the uveal tract.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
