CNS USA Exam 3 Questions & Answers 2024/2025
What are the 3 layers of the human eye? - ANSWERSSclera, Choroid, and Retina
From the inside out, how does the structures of the eye lie? - ANSWERSOuter sclera, transparent cornea
Anterior chamber (Aqueous humor)
Iris
Pupil
Lens
Posterior ch...
What are the 3 layers of the human eye? - ANSWERSSclera, Choroid, and Retina
From the inside out, how does the structures of the eye lie? - ANSWERSOuter sclera, transparent cornea
Anterior chamber (Aqueous humor)
Iris
Pupil
Lens
Posterior chamber (Vitreous humor)
Retina
What type of photoreceptors does the retina contain? - ANSWERSRods and Cones
Which photoreceptors function is vision in low lighting? - ANSWERSRods
Which photoreceptors function is color vision and high spatial/temporal resolution? - ANSWERSCones
What are the 8 layers of the retina starting at the direction of light? - ANSWERSStratum opticum
Ganglion cell layer
Inner plexiform layer
Inner nuclear layer
Outer plexiform layer
Outer nuclear layer
Pigmented layer
,Which type of cells continue as the optic nerve? - ANSWERSGanglion cell axons
Depression in the center of the macula where eyesight is maximum (maximum visual acuity) is called? -
ANSWERSFovea centralis
The macula is located where? - ANSWERSon the retina and surrounds the fovea
Photoreceptors are high in which region of the visual system? - ANSWERSMacula
What is responsible for central vision? - ANSWERSMacula
What 2 types of diseases are related to the macula? - ANSWERSAge-related macula degeneration (AMD)
Diabetic macular edema (DME)
The point of exit of the ganglion cell axons and lies 15deg medial to fovea is where? - ANSWERSOptic disc
What is the spot on the retina called where photoreceptors are absent? - ANSWERSBlind spot
What is the field of vision? - ANSWERSThe degrees of visual angle during stable fixation of the eyes
How many degrees is the total visual field of both eyes? - ANSWERS200 degrees
How many degrees is the region of binocular overlap of the vision field? - ANSWERS120 degrees
The upper half of a person's body will enter which part of the retina? - ANSWERSLower retina
The lower half of a person's body will enter which part of the retina? - ANSWERSUpper retina
The temporal field of vision is projected to which part of the retina? - ANSWERSNasal part of retina
, The nasal field of vision is projected to which part of the retina? - ANSWERSTemporal part of retina
Describe the visual pathway - ANSWERSOptic N
Optic chiasm
Optic tract
LGN of thalamus
Optic radiations
Visual cortex
What carries information about temporal field of vision is crossed over? - ANSWERSOptic chiasm
What consists of ipsilateral nasal field and opposite side temporal field information? - ANSWERSOptic
tract
Where does the first synapse of the visual pathway occur? - ANSWERSLGN of thalamus
Which fibers pass through parietal lobe? - ANSWERSSuperior temporal radiations
Which fibers pass through the temporal lobe? - ANSWERSMayer's loop
The superior temporal radiations project to? - ANSWERSCuneus at Upper bank of calcarine fissure
Mayer's loop projects to? - ANSWERSLingula at Lower bank of calcarine fissure
Where is the primary visual cortex located? - ANSWERSon the banks of the calcarine fissure in occipital
lobe
A lesion that occurs at the upper bank causes? - ANSWERScontralateral inferior quadrant defects
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