NAO BOOK 1 EXAM 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 Collection of the thin film of
tears on the lower lid margin


Ectropia - ANSWER Eyelids turn outward


Entropion - ANSWER Eyelids turn inward


Conjunctiva - ANSWER Mucous membrane lining lids & globe


Goblet cells - ANSWER produce mucus


Conjunctivitis - ANSWER inflammation of the conjunctiva


First tunic (outer tunic) - ANSWER Sclera, cornea, limbus


2nd tunic (middle tunic) - ANSWER Sclera-retina (iris, ciliary body, choroid)

, 3rd tunic (inner tunic) - ANSWER Retina


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 Surrounds 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


Posterior chamber - ANSWER Between the iris and crystalline lens