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23 Cards in this Set
- Front
- Back
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What are the three layers of the eye?
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Fibrous
Uvea Retinal |
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What are the parts of the fibrous layer?
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Sclera
Cornea |
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What are the parts of the uvea/choroid layer?
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Choroid
Ciliary body Iris |
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What is the main refractive structure of the eye?
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Cornea
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Why is the sclera an important structure?
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Helps maintain shape of eye
Where ocular muscles attach |
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What is the role of the choroid?
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Helps to focus and regulate light intensity
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What structure produces aqueous and vitreous humor?
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Ciliary body
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What is the pathway of aqueous humor?
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Produced by ciliary body --> posterior chamber --> pupil --> anterior chamber --> trebecular meshwork --> canal of Schlemm--> episcleral veins
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What is presbyopia?
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When the lens hardens as one ages and is not able to accommodate as efficiently
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What photopigment is found in rods?
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Rhodopsin
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What photopigment is found in cones?
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Iodopsin
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What tumors can compress the optic chiasm?
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Pituitary tumor
Craniopharyngioma |
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Why is the optic tract easily affected by increased intracranial pressure?
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Optic nerve is continuous with subarachoid space
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The medial part of the chiasm can be affected by ____ while the lateral part of the chiasm can be affected by ____.
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Pituitary stalk
Internal carotid |
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Why is the visual cortex also known as the striate cortex?
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Line of Gennari
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In neural development, what is the retina an outgrowth of?
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Neural tube
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For the consensual pupillary response, the fibers of the optic tract crosses where?
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Posterior commissure
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Shining the light a patient's eye tests the integrity of what three things?
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Optic nerve (ipsilateral)
Both oculomotor nerves Pretectal region of midbrain (light reflex center) |
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What is the near triad?
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Occurs during accommodation reflex where there is constriction, vergence and accommodation of lens
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Does the frontal eye field affect contralateral or ipsilateral eye movement?
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Contralateral
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What is the pathway of smooth pursuit eye movements through the temporal eye field?
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Visual cortex input --> dorsallateral pontine nucle --> flocculus --> vestibular nuclei --> ocular muscles
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A transient paralysis of horizontal gaze is a result of damage to what?
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Frontal eye field
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A permanent paralysis of horizontal gaze is a result of damage to what?
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Horizontal gaze center
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