T — Eye Flashcards
Which part of the brain is primarily responsible for vision?
A) Parietal lobe
B) Temporal lobe
C) Occipital lobe
D) Frontal lobe
c
What is the function of the sclera?
A) Converts light into electrical signals
B) Controls the amount of light entering the eye
C) Covers the exposed portion of the eye
D) Focuses incoming light onto the retina
c
Which two blood vessels supply the eye with nutrients?
A) Choroidal and retinal vessels
B) Optic and corneal arteries
C) Retinal and scleral capillaries
D) Pupillary and aqueous vessels
a
What is the role of the retina?
A) Focuses incoming light onto the eye
B) Regulates the size of the pupil
C) Contains photoreceptors that convert light into electrical signals
D) Protects the eye from external damage
c
What is the function of the cornea?
A) Absorbs excess light to reduce glare
B) Gathers and focuses incoming light
C) Controls eye movement
D) Regulates blood flow to the eye
b
6What is the colored part of the eye called?
A) Sclera
B) Retina
C) Cornea
D) Iris
d
Where is the anterior chamber located?
A) Between the iris and the lens
B) In front of the iris
C) Behind the retina
D) Surrounding the optic nerve
b
The posterior chamber is located:
A) Between the cornea and iris
B) Behind the retina
C) Between the iris and the lens
D) Surrounding the optic nerve
c
What is the function of the dilator pupillae muscle?
A) Increases the size of the pupil in response to fight-or-flight signals
B) Reduces the size of the pupil in bright light
C) Adjusts the focus of the lens
D) Converts light into electrical signals
a
What does the constrictor pupillae muscle do?
A) Dilates the pupil during stress
B) Constricts the pupil in response to rest-and-digest signals
C) Sends signals from the eye to the brain
D) Controls blood flow to the retina
b
What is the function of aqueous humor?
A) Transmits electrical signals from the retina to the brain
B) Fills the front part of the eye and drains through the canal of Schlemm
C) Adjusts the shape of the lens for focusing
D) Detects differences in brightness and color
b
Where is aqueous humor produced?
A) Vitreous body
B) Retina
C) Ciliary body
D) Optic nerve
c
What is the role of the lens?
A) Converts light into electrical signals
B) Controls how light is bent or refracted to focus images
C) Detects color and fine details
D) Regulates pupil dilation and constriction
b
What does the ciliary muscle do?
A) Produces aqueous humor for the front of the eye
B) Changes the shape of the lens to help focus on objects at different distances
C) Detects differences in light intensity
D) Controls the contraction of the iris
b
Which structure helps maintain the shape of the eye and keep the retina in place?
A) Ciliary body
B) Aqueous humor
C) Vitreous humor
D) Lens
c
According to the duplicity theory of vision, the retina contains:
A) Two types of photoreceptors, one for light/dark and one for color
B) Only cones for high-acuity vision
C) A single type of receptor for all light detection
D) A network of neurons without specialized receptors
a
Which of the following is NOT a function of cones?
A) Detecting fine details
B) Functioning well in bright light
C) Providing color vision
D) High sensitivity to dim light
d
How many types of cones are there, and what colors do they detect?
A) Two types: blue and yellow
B) Three types: short (blue), medium (green), long (red)
C) One type: black and white vision
D) Four types: red, blue, green, yellow
b
What is the primary function of rods?
A) Detecting fine details and color
B) High-resolution vision in bright light
C) Sensing light and dark, but not color
D) Regulating the shape of the lens
c
What is the single pigment found in rods?
A) Rhodopsin
B) Melanin
C) Opsin
D) Photopsin
a
What is the fovea?
A) A cluster of rods in the periphery of the retina
B) The center of the macula that contains only cones
C) A region in the thalamus that processes vision
D) A structure that connects the retina to the brain
b
Which cells do rods and cones directly connect to?
A) Ganglion cells
B) Parvocellular cells
C) Bipolar cells
D) Magnocellular cells
c
What do ganglion cells do?
A) Detect motion and spatial resolution
B) Highlight differences between rods and cones
C) Form the optic nerve and send visual signals to the brain
D) Process information about brightness changes
c
Where are horizontal and bipolar cells located?
A) In the optic nerve
B) In the occipital lobe
C) Behind the rods and cones
D) In front of the rods and cones, closer to the front of the eye
d
Why can color vision detect more detail than black-and-white vision?
A) Cones are more sensitive to motion than rods
B) Fewer cones connect to a single ganglion cell compared to rods
C) Rods are concentrated in the fovea
D) Black-and-white vision has higher spatial resolution
b
What is parallel processing in vision?
A) The ability to detect motion without seeing color
B) The recognition of color, shape, and motion simultaneously
C) The crossing of optic nerves in the optic chiasm
D) The conversion of visual signals into electrical impulses
b
What is spatial resolution?
A) The ability to detect fine details of an object
B) The speed at which objects move in the field of vision
C) The processing of visual signals in the optic chiasm
D) The ability to distinguish between colors in dim light
a
What type of cells detect shape and have high spatial resolution?
A) Magnocellular cells
B) Ganglion cells
C) Parvocellular cells
D) Rhodopsin cells
c
What does temporal resolution refer to?
A) The ability to detect motion over time
B) The ability to process color and brightness changes
C) The crossing of visual signals at the optic chiasm
D) The adaptation of the pupil to different light conditions
a
What is the function of magnocellular cells?
A) Detecting color and shape
B) Detecting motion with high temporal resolution
C) Detecting motion with low spatial resolution
D) Processing fine visual details
c
Which brain region processes visual information?
A) Parietal lobe
B) Visual cortex in the occipital lobe
C) Temporal lobe
D) Thalamus
b
What happens at the optic chiasm?
A) The retina sends signals directly to the occipital lobe
B) Visual signals cross over before reaching the brain
C) The pupil dilates in response to light
D) Ganglion cells process visual information
b
What is the function of the lateral geniculate nucleus?
A) Detecting motion and color differences
B) Converting light into electrical signals
C) Relaying visual information from the retina to the visual cortex
D) Regulating the amount of light entering the eye
c
How does the sympathetic nervous system affect vision?
A) It constricts the pupil to restrict light
B) It dilates the pupil to allow more light in
C) It increases the sensitivity of rods to detect color
D) It decreases the brain’s ability to process visual signals
b
What does the parasympathetic nervous system do in relation to vision?
A) It dilates the pupil for better vision in low light
B) It increases the sensitivity of the retina to bright light
C) It constricts the pupil to reduce light intake
D) It enhances the processing of motion and shape
c
