NAO Volume 1: Questions With Accurate Solutions
(Solved)
What is the axial length of the average eye? Right Ans - 26.5mm
What is another word for the eyelids? Right Ans - Palpebrae
What muscle relaxes to allow the eyelid to droop or sag? Right Ans -
Frontalis
What is the size of the bony orbit in the average adult? Right Ans - 35mm-
40mm
Reflex tears are produced by________ and are generally caused by_______?
Right Ans - -The lacrimal glands
- Stimulus such as coughing, sneezing, strong smells, emotions
Which glands produce basic tear secretion? Right Ans - Glands of wolfing
and glands of krause
The three layers of the tear film in order from outermost to innermost are
the? Right Ans - Lipid, aqueous, mucin
The layer of the tear film that contains the nutrients and antibiotic properties
is the? Right Ans - Aqueous
The layer of the tear film that is responsible for prevention of evaporation is
the? Right Ans - Lipid
The layer of the tear film that is responsible for holding the tears on the
cornea is the? Right Ans - Mucin
The term for the collection of the thin film of tears on the lower lid margin is?
Right Ans - Tear lake, Tear prism, Tear meniscus
What is the term for the eyelids turning outward? Right Ans - Ectropion
What is the term for the eyelids turning inward? Right Ans - Entropion
,What is the name of the mucous membrane that lines the lids and the globe of
the eye? Right Ans - Conjunctiva
What do the goblet cells produce? Right Ans - Mucous
What is the term for an inflammation of the conjunctiva? Right Ans -
Conjunctivitis
The outer tunic consists of the______ ,_______ and additionally the _____ and
______? Right Ans - -Sclera
-Cornea
-Limbus
-Fibrous
The five layers of the cornea from outermost to innermost in order are?
Right Ans - -Epithelium
-Bowman's Layer
-Stroma
-Descemet's membrane
-Endothelium
The average power of the cornea is? Right Ans - 42.00-45.00 diopters
The cornea receives oxygen from? Right Ans - Tears, and blood vessels
How many layers are there in the epithelium? Right Ans - 5 to 7
If this layer of the cornea is damaged, scar tissue will form? Right Ans -
Bowman's layer
If the eye is deprived of oxygen, this layer will lose more cells, more quickly
cause swelling of the eye? Right Ans - Endothelium
The canal of schlemm encircles the_______ region, which is where the aqueous
drains into the trabecular meshwork? Right Ans - Limbal
The middle tunic is the ________ tunic and is located between ________ and
________? Right Ans - -Vascular
,-Sclera
-Retina
The ciliary body consists of the ________ and the ________? Right Ans - -Ciliary
muscle
-Ciliary process
The anterior chamber is located ________? Right Ans - Between the back
surface of the cornea and the iris.
The posterior chamber is located________? Right Ans - Between the iris and
the crystalline lens.
An inflammation of the iris is called? Right Ans - Iritis
A difference in pupil size is called? Right Ans - Anisocoria
Which muscle constricts causing the pupil to become smaller? Right Ans -
Sphincter
Which muscle dilates causing the pupil to become larger? Right Ans -
Dilator
The inner tunic is the _______ and is the _______ tunic? Right Ans - -Retina
-Light Sensitive
The aqueous humor is produced by the? Right Ans - Ciliary process
If a patient experiences "floaters", where are they located? Right Ans - In
the vitreous
Absence of the crystalline lens is referred to as? Right Ans - Aphakia
How much amplitude of accommodation does the average person have at
birth? Right Ans - 15 diopters
Loss of accommodation is called? Right Ans - Presbyopia
, List the 6 extra ocular muscles, listing the four straight muscles first and then
the two slanting muscles last? Right Ans - 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? Right Ans - Tropia
what are the two parts of the first tunic? Right Ans - Cornea and Sclera
What is the inner most layer of the cornea? Right Ans - Endothelium
How does the cornea primarily receive the nutrients it requires? Right Ans
- 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?
Right Ans - 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? Right Ans - Anisometropia
What is the primary purpose of the choroid? Right Ans - Supply nutrients
to the retina
What is photopic vision? Right Ans - Using cones in lighted conditions
Which area of the retina is responsible for fine detailed vision? Right Ans -
Fovea
What is the difference between extrinsic ocular muscles and the intrinsic
ocular muscles? Right Ans - Extrinsic muscles attach to the sclera
What is the difference between adduction and abduction? Right Ans - -
Adduction is turning inwards
-Abduction is turning outwards
(Solved)
What is the axial length of the average eye? Right Ans - 26.5mm
What is another word for the eyelids? Right Ans - Palpebrae
What muscle relaxes to allow the eyelid to droop or sag? Right Ans -
Frontalis
What is the size of the bony orbit in the average adult? Right Ans - 35mm-
40mm
Reflex tears are produced by________ and are generally caused by_______?
Right Ans - -The lacrimal glands
- Stimulus such as coughing, sneezing, strong smells, emotions
Which glands produce basic tear secretion? Right Ans - Glands of wolfing
and glands of krause
The three layers of the tear film in order from outermost to innermost are
the? Right Ans - Lipid, aqueous, mucin
The layer of the tear film that contains the nutrients and antibiotic properties
is the? Right Ans - Aqueous
The layer of the tear film that is responsible for prevention of evaporation is
the? Right Ans - Lipid
The layer of the tear film that is responsible for holding the tears on the
cornea is the? Right Ans - Mucin
The term for the collection of the thin film of tears on the lower lid margin is?
Right Ans - Tear lake, Tear prism, Tear meniscus
What is the term for the eyelids turning outward? Right Ans - Ectropion
What is the term for the eyelids turning inward? Right Ans - Entropion
,What is the name of the mucous membrane that lines the lids and the globe of
the eye? Right Ans - Conjunctiva
What do the goblet cells produce? Right Ans - Mucous
What is the term for an inflammation of the conjunctiva? Right Ans -
Conjunctivitis
The outer tunic consists of the______ ,_______ and additionally the _____ and
______? Right Ans - -Sclera
-Cornea
-Limbus
-Fibrous
The five layers of the cornea from outermost to innermost in order are?
Right Ans - -Epithelium
-Bowman's Layer
-Stroma
-Descemet's membrane
-Endothelium
The average power of the cornea is? Right Ans - 42.00-45.00 diopters
The cornea receives oxygen from? Right Ans - Tears, and blood vessels
How many layers are there in the epithelium? Right Ans - 5 to 7
If this layer of the cornea is damaged, scar tissue will form? Right Ans -
Bowman's layer
If the eye is deprived of oxygen, this layer will lose more cells, more quickly
cause swelling of the eye? Right Ans - Endothelium
The canal of schlemm encircles the_______ region, which is where the aqueous
drains into the trabecular meshwork? Right Ans - Limbal
The middle tunic is the ________ tunic and is located between ________ and
________? Right Ans - -Vascular
,-Sclera
-Retina
The ciliary body consists of the ________ and the ________? Right Ans - -Ciliary
muscle
-Ciliary process
The anterior chamber is located ________? Right Ans - Between the back
surface of the cornea and the iris.
The posterior chamber is located________? Right Ans - Between the iris and
the crystalline lens.
An inflammation of the iris is called? Right Ans - Iritis
A difference in pupil size is called? Right Ans - Anisocoria
Which muscle constricts causing the pupil to become smaller? Right Ans -
Sphincter
Which muscle dilates causing the pupil to become larger? Right Ans -
Dilator
The inner tunic is the _______ and is the _______ tunic? Right Ans - -Retina
-Light Sensitive
The aqueous humor is produced by the? Right Ans - Ciliary process
If a patient experiences "floaters", where are they located? Right Ans - In
the vitreous
Absence of the crystalline lens is referred to as? Right Ans - Aphakia
How much amplitude of accommodation does the average person have at
birth? Right Ans - 15 diopters
Loss of accommodation is called? Right Ans - Presbyopia
, List the 6 extra ocular muscles, listing the four straight muscles first and then
the two slanting muscles last? Right Ans - 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? Right Ans - Tropia
what are the two parts of the first tunic? Right Ans - Cornea and Sclera
What is the inner most layer of the cornea? Right Ans - Endothelium
How does the cornea primarily receive the nutrients it requires? Right Ans
- 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?
Right Ans - 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? Right Ans - Anisometropia
What is the primary purpose of the choroid? Right Ans - Supply nutrients
to the retina
What is photopic vision? Right Ans - Using cones in lighted conditions
Which area of the retina is responsible for fine detailed vision? Right Ans -
Fovea
What is the difference between extrinsic ocular muscles and the intrinsic
ocular muscles? Right Ans - Extrinsic muscles attach to the sclera
What is the difference between adduction and abduction? Right Ans - -
Adduction is turning inwards
-Abduction is turning outwards
