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NAO BOOK 1 QUESTIONS AND ANSWERS
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NAO BOOK 1 QUESTIONS AND ANSWERS
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NAO BOOK 1QUESTIONS
AND ANSWERS
Reflex tears - Answers- Produced by lacrimal glands & are caused by stimulus such as
coughing, sneezing, strong smells & emotions
Layers of tear film (outer-innermost) - Answers- Lipid, aqueous, mucin
Tear lake, tear prism, tear meniscus - Answers- Collection of the thin film of tears on the
lower lid margin
Ectropia - Answers- Eyelids turn outward
Entropion - Answers- Eyelids turn inward
Conjunctiva - Answers- Mucous membrane lining lids & globe
Goblet cells - Answers- produce mucus
Conjunctivitis - Answers- inflammation of the conjunctiva
First tunic (outer tunic) - Answers- Sclera, cornea, limbus
2nd tunic (middle tunic) - Answers- Sclera-retina (iris, ciliary body, choroid)
3rd tunic (inner tunic) - Answers- Retina
Outer tunic - Answers- Fibrous; receives O2 from tears and blood vessels
, Layers of the cornea (outermost-innermost) - Answers- Epithelium, Bowman's layer,
stroma, descements membrane, endothelium
Epithelium - Answers- Has 5-7 layers
Bowman's layer - Answers- If damaged, scar tissue will form
Endothelium - Answers- If deprived of O2, will lost cells quickly & cause swelling
Average power of the cornea - Answers- 42.00-45.00 diopters
Canal of Schlemm - Answers- Encircles the lumbar region; where aqueous drains into
the trabecular meshwork
Middle tunic - Answers- vascular
Inner tunic - Answers- Light sensitive
Anterior chamber - Answers- Back surface of the cornea & the iris
Posterior chamber - Answers- Between the iris and crystalline lens
Anisocoria - Answers- unequal pupil size
Iritis - Answers- inflammation of the iris
Sphincter - Answers- Muscle that constricts, causing the pupil to become smaller
Dilator - Answers- Muscle dilates causing the pupil to become larger
Floaters - Answers- Located in the vitreous
Aphakia - Answers- Absence of the crystalline lens
Presbyopia - Answers- loss of accommodation
6 extraocular muscles - Answers- Medial rectus, lateral rectus, inferior rectus, superior
rectus, superior oblique, inferior oblique
-tropia - Answers- A definite turning of the eye
Tear film - Answers- How the cornea primarily received it's nutrients
Irregular astigmatism - Answers- A refractive condition caused by a cornea which is
damaged and irregular so that rays of light come to many focal points on the retina; is
not correctable by cylinders.
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