Low Vision Lecture 1 Flashcards
The outer layer of the eyeball is made up of the ____ and the _____
Cornea, sclera
The middle layer of the eyeball is the _____ layer
Supportive (muscles and blood supply)
The choroid is the blood supply source in the ____ layer of the eye
Middle
The middle layer of the eye is made up of the
Vitreous humor, choroid, angle, lens, iris, canal of schlemm
The inner layer of the eye is the ____ layer
sensory
The most sensitive area of vision is located within the ____
Fovea
Cornea’s main job is to
Bend light into the eye
True of false: the cornea contains no blood vessels
True
Which part of the eye is most often implicated in correctable vision impairments?
Cornea
What part of the eye is the outermost lens?
Cornea
Which part of the eye shields from germs?
Cornea
Iris is the _________ part
Colored
The ____ is a diaphragmatic structure
Iris
The pupil becomes at near, at rest, in bright light
smaller
The sole function of the lens is to
Focus light onto the retina
The lens is held by bungee like structures called the _________
Zonnules of Zinn
The lens becomes more ___________ as an object gets closer
Rounded
The retina initiates the ___________ of vision
Sensation
There are a lot more ______ than ______-
Rods
Cones
The rods are responsible for ____ light, while the cones are responsible for _____ light
Bright
Dim
The ______ cover peripheral vision and motion
Rods
The macula is small, but has a _________ in the brain
Large respresentation
The _________ is the area of clearest vision
It is where light can be directly on the retina
Fovea
Optic nerve (sensory component) is cranial nerve number __
2
Oculomotor nerve is CN ___
3
Eye movement:
Ductions are
One eye at a time
Eye movement:
Versions
Both eyes in same directions
Eye movement:
Vergences
Both eyes in opposite directions
A gaze stabilizing movement is caused by the __________ reflex
Vestibulo-ocular
The optokinetic reflex is the attempt of the eyes to follow a ______
Moving object
Scanning is the ability to
Shift the area of clearest vision back and forth in order to find or identify an object (saccades)
Tracking is the ability to
Follow a moving visual target while keeping the target in the area of clearest vision (pursuits) this is done with slower moving objects
The three foundations of vision are
Oculomotor function, visual fields, visual acuity
80% of people receiving vision rehabilitation have ________ or “blind spots”
Central scotomas
Binocularity is the ability to
Use both eyes together
Stereopsis
The ability to put the images from each eye together into one jointed picture
