Objectives 16-18 Flashcards
what is miosis?
parasympathetic constriction of radial muscles for close vision
what is the term for farsightedness?
hyperopia
which cranial nerve transmits vision info from brain to eyes?
CN III oculomotor
what is the term for nearsightedness?
myopia
which tunic is the fibrous layer of the eye?
sclera
which 2 cranial nerves are involved in pupillary reflex?
CN II and III
what causes hyperopia?
eye is short; light rays converge too late
which drugs have an increased effect on miosis?
cholinergic
condition in which there is asymmetry between the cornea and lens
astigmatism
area of the eye with the greatest concentration of cones, acuity, and color vision
fovea centralis
which tunic is the neurovascular layer of the eye?
choroid
which drugs have an increased effect on mydriasis
adrenergic
which cranial nerve transmits light info from eyes to brain?
CN II optic
how do the eye muscles respond for distance vision?
relaxation of ciliary and radial muscles; suspensory ligaments tense
what are the 2 types of muscle that move the pupil?
circular and radial muscles
what are the 3 tunics of the eye, from deep to superficial?
retina, choroid, sclera
age-related near-vision loss when the lens becomes less elastic
presbyopia
which muscle of the iris is responsible for miosis?
circular muscle
which cranial nerve is involved with miosis?
parasympathetic fibers of oculomotor
process by which the lens changes its degree of convexity
accomodation
which muscle of the iris is responsible for mydriasis?
radial muscle
what shape is the lens for distance vision?
flat
what is mydriasis?
sympathetic dilation of radial muscles for distance vision
how do the eye muscles respond for close vision?
contraction of ciliary and radial muscles; suspensory ligaments relax
what is the word for normal vision?
emmetropia
what causes myopia?
eye is elongated; light rays converge too early
what shape is the lens for close vision?
round
