NAO Volume 1 2024/2025 updated questions with complete solution
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Course
NAO
Institution
NAO
What is the axial length of the average eye? - correct answer 26.5mm
What is another word for the eyelids? - correct answer Palpebrae
What muscle relaxes to allow the eyelid to droop or sag? - correct answer
Frontalis
What is the size of the bony orbit in the average adult? - correct answer 35m...
NAO Volume 1 2024/2025 updated questions with
complete solution
What is the axial length of the average eye? - correct answer 26.5mm
What is another word for the eyelids? - correct answer Palpebrae
What muscle relaxes to allow the eyelid to droop or sag? - correct answer
Frontalis
What is the size of the bony orbit in the average adult? - correct answer 35mm-
40mm
Reflex tears are produced by________ and are generally caused by_______? -
correct answer -The lacrimal glands
- Stimulus such as coughing, sneezing, strong smells, emotions
Which glands produce basic tear secretion? - correct answer Glands of wolfing
and glands of krause
The three layers of the tear film in order from outermost to innermost are the? -
correct answer Lipid, aqueous, mucin
The layer of the tear film that contains the nutrients and antibiotic properties is
the? - correct answer Aqueous
The layer of the tear film that is responsible for prevention of evaporation is the?
- correct answer Lipid
The layer of the tear film that is responsible for holding the tears on the cornea is
the? - correct answer Mucin
The term for the collection of the thin film of tears on the lower lid margin is? -
correct answer Tear lake, Tear prism, Tear meniscus
What is the term for the eyelids turning outward? - correct answer Ectropion
What is the term for the eyelids turning inward? - correct answer Entropion
What is the name of the mucous membrane that lines the lids and the globe of
the eye? - correct answer Conjunctiva
What do the goblet cells produce? - correct answer Mucous
What is the term for an inflammation of the conjunctiva? - correct answer
Conjunctivitis
The outer tunic consists of the______ ,_______ and additionally the _____ and
______? - correct answer -Sclera
-Cornea
-Limbus
-Fibrous
The five layers of the cornea from outermost to innermost in order are? - correct
answer -Epithelium
-Bowman's Layer
,NAO Volume 1 2024/2025 updated questions with
complete solution
-Stroma
-Descemet's membrane
-Endothelium
The average power of the cornea is? - correct answer 42.00-45.00 diopters
The cornea receives oxygen from? - correct answer Tears, and blood vessels
How many layers are there in the epithelium? - correct answer 5 to 7
If this layer of the cornea is damaged, scar tissue will form? - correct answer
Bowman's layer
If the eye is deprived of oxygen, this layer will lose more cells, more quickly cause
swelling of the eye? - correct answer Endothelium
The canal of schlemm encircles the_______ region, which is where the aqueous
drains into the trabecular meshwork? - correct answer Limbal
The middle tunic is the ________ tunic and is located between ________ and
________? - correct answer -Vascular
-Sclera
-Retina
The ciliary body consists of the ________ and the ________? - correct answer -
Ciliary muscle
-Ciliary process
The anterior chamber is located ________? - correct answer Between the back
surface of the cornea and the iris.
The posterior chamber is located________? - correct answer Between the iris
and the crystalline lens.
An inflammation of the iris is called? - correct answer Iritis
A difference in pupil size is called? - correct answer Anisocoria
Which muscle constricts causing the pupil to become smaller? - correct answer
Sphincter
Which muscle dilates causing the pupil to become larger? - correct answer Dilator
The inner tunic is the _______ and is the _______ tunic? - correct answer -Retina
-Light Sensitive
The aqueous humor is produced by the? - correct answer Ciliary process
If a patient experiences "floaters", where are they located? - correct answer In
the vitreous
Absence of the crystalline lens is referred to as? - correct answer Aphakia
How much amplitude of accommodation does the average person have at birth? -
correct answer 15 diopters
, NAO Volume 1 2024/2025 updated questions with
complete solution
Loss of accommodation is called? - correct answer Presbyopia
List the 6 extra ocular muscles, listing the four straight muscles first and then the
two slanting muscles last? - correct answer 1. Medial rectus
2. lateral rectus
3. Inferior rectus
4. Superior rectus
5. Superior oblique
6. Inferior oblique
A term that refers to the definite turning of an eye is? - correct answer Tropia
what are the two parts of the first tunic? - correct answer Cornea and Sclera
What is the inner most layer of the cornea? - correct answer Endothelium
How does the cornea primarily receive the nutrients it requires? - correct answer
Tear film
The refractive condition caused by a damaged cornea so that rays of light come to
many focal points (not 90 degree apart) on the retina is known as? - correct
answer Irregular astigmatism
A condition in which the refractive error of one eye significantly differs from that
of the other and where both eyes have the same sign (i.e. both eyes are myopic
and hyperopic) is known as? - correct answer Anisometropia
What is the primary purpose of the choroid? - correct answer Supply nutrients to
the retina
What is photopic vision? - correct answer Using cones in lighted conditions
Which area of the retina is responsible for fine detailed vision? - correct answer
Fovea
What is the difference between extrinsic ocular muscles and the intrinsic ocular
muscles? - correct answer Extrinsic muscles attach to the sclera
What is the difference between adduction and abduction? - correct answer -
Adduction is turning inwards
-Abduction is turning outwards
What is the primary position of the eye? - correct answer Looking straight ahead
What is the secondary position of the eye? - correct answer Looking up or down
Where is the ora serrata located? - correct answer Outer limits of the retina
adjacent to the ciliary body
Where does the optic nerve begin? - correct answer Optic disk
What takes place in the optic chiasm? - correct answer Optical images split and
recombine
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