What is the sclera?
The white part
The coloured part
The black part
The covering
(a) What is the iris? and (b) What does it do?
(a) The coloured bit, (b) Controls amount of light entering eye
(a) The coloured bit, (b) Point at which light enters the eye
(a) The black bit, (b) Controls amount of light entering eye
(a) The black bit, (b) Point at which light enters the eye
(a) What is the pupil, and (b) What does it do?
(a) The black bit, (b) Lets light enter the eye
(a) The black bit, (b) Controls amount of light entering the eye
(a) The coloured bit, (b) Lets light enter the eye
(a) The coloured bit, (b) Controls amount of light entering the eye
The eye needs to create an image on what?
The retina
The fovea
The optic nerve
The primary visual cortex
Which two sections of the eye act to focus light onto the retina?
Corenea and lens
Cornea and pupil
Lens and iris
Pupil and iris
Photoreceptors on the retina pick up information about the image which is taken where?
Down the optic nerve to the brain
Through the ganglion cells to the bipolar cells
Down the optic nerve to the bipolar cells
Through the ganglion cells to the horizontal cells
Rays of light need to be just focused on the retina. When they are just in front, this is called (a) and (b) lens is needed.
(a) Myopia (nearsightedness), (b) Concave
(a) Myopia (nearsightedness), (b) Convex
(a) Hyperopia (farsightedness), (b) Concave
(a) Hyperopia (farsightedness), (b) Convex
Rays of light need to be just focused on the retina. When they are just behind, this is called (a) and (b) lens is needed.
Myopia (nearsightedness), (b) Concave
What are the photoreceptors that respond to light?
Rods and cones
Rods and bipolar cells
Cones and ganglion cells
Bipolar cells and ganglion cells
What is the function of bipolar cells?
Transfer information from the photoreceptors to the ganglion cells
Act as a photoreceptor
Transfer information to the brain
Allow ganglion cells to communicate with one another
What is the function of horizontal cells?
Allows adjacent retina cells to communicate
Acts as a photoreceptor
Transfers information from photoreceptors to ganglion cells
Transfers information to the brain
What is the function of ganglion cells?
Transfer information from photoreceptors to bipolar cells
Enable adjacent retinal cells to communicate
Act as photoreceptors
What are the three types of cones?
(1) S-cones, long wavelengths, blueish (2) M-cones, medium wavelengths, greenish (3) L-cones, short wavelengths, redish
(1) S-cones, short wavelengths, blueish (2) M-cones, medium wavelengths, greenish (3) L-cones, long wavelengths, redish
(1) S-cones, long wavelengths, greenish (2) M-cones, medium wavelengths, redish (3) L-cones, short wavelengths, blueish
(1)L-cones, long wavelengths, blueish (2) S-cones, medium wavelengths, greenish (3) M-cones, short wavelengths, redish
The fovea (retinal center) only has (a) and is specialised for (b)
(a) Cones, (b) high acuity colour vision
(a) Rods, (b) high acuity colour vision
(a) Cones, (b) high acuity monochrome vision
(a) Rods, (b) high acuity monochrome vision
Outline the blindspot
Has no photoreceptors, we tend to be unaware of this
Has a dense population of photoreceptors, we tend to be unaware of this
Has no photoreceptors, we tend to be aware of this
Has a dense population of photoreceptors, we tend to be aware of this
Rods are only used at (a), this is called (b)
(a) low light levels, (b) scotopic vison
(a) low light levels, (b) photopic vision
(a) high light levels, (b) scotopic vision
(a) high light levels, (b) photopic vision
Cones are most sensitive at (a) light levels, this is called (b)
(a) high, (b) photopic vision
(a) high, (b) scotopic vision
(a) low, (b) photopic
(a) low, (b) scotopic
At dim light levels perception lacks what?
colour and detail
colour and texture
depth and detail
depth and texture
Total dark adaptation takes (a) and is first controlled by cones for (b) before being taken over by rods
(a) 30 minutes, (b) 5-10 minutes
(a) 60 minutes, (b) 5-10 minutes
(a) 30 minutes, (b) 1-2 minutes
(a) 60 minutes, (b) 1-2 minutes
