NAO Book 1 Exam Study Guide Questions
and Answers
Reflex tears - ANSWER-Produced by lacrimal glands & are caused by stimulus such as coughing,
sneezing, strong smells & emotions
Layers of tear film (outer-innermost) - ANSWER-Lipid, aqueous, mucin
Tear lake, tear prism, tear meniscus - ANSWER-C...
Outer tunic - ANSWER✔✔-Fibrous; receives O2 from tears and blood vessels
Layers of the cornea (outermost-innermost) - ANSWER✔✔-Epithelium, Bowman's layer, stroma,
descements membrane, endothelium
Epithelium - ANSWER✔✔-Has 5-7 layers
Bowman's layer - ANSWER✔✔-If damaged, scar tissue will form
Endothelium - ANSWER✔✔-If deprived of O2, will lost cells quickly & cause swelling
Average power of the cornea - ANSWER✔✔-42.00-45.00 diopters
Canal of Schlemm - ANSWER✔✔-Encircles the lumbar region; where aqueous drains into the trabecular
meshwork
Middle tunic - ANSWER✔✔-vascular
Inner tunic - ANSWER✔✔-Light sensitive
Anterior chamber - ANSWER✔✔-Back surface of the cornea & the iris
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