Question 1

The visual receptors that are used under dim light and produce only black and white sensations are the
A) rods.
B) cones.
C) phosphenes.
D) stereocilia.

Accepted Answer

Rods are the visual receptors that are highly responsive to light under low light conditions and they only produce black and white sensations. Cones on the other hand are responsible for color vision and require more light to function properly. Phosphenes are the sensations of light that are perceived without light entering the eyes, such as when pressure is applied to the eyes. Stereocilia are not related to vision, but instead refer to small hair-like structures found in the inner ear that are important for hearing.

Question 2

When you see colors and bright light,you are using the visual receptors known as
A) rods.
B) cones.
C) phosphenes.
D) stereocilia.

Accepted Answer

Rods are responsible for detecting light under low-light conditions, while cones are responsible for color vision and detecting bright light. Phosphenes refer to the sensation of seeing light without there actually being any present, and stereocilia are tiny hair-like structures in the ear responsible for detecting sound. Therefore, the correct answer is B, cones.

Question 3

The cones of the retina
A) are responsible for peripheral vision.
B) are specialized for color sensations and fine details.
C) function best in dim light conditions.
D) are much more sensitive to light than the rods are.

Accepted Answer

Cones are responsible for color vision and detecting fine details, making them more sensitive to light than rods. However, they do not function as well in dim light conditions and are responsible for central vision rather than peripheral vision.

Question 4

Bifocal lenses are used to correct
A) near vision.
B) distance vision.
C) presbyopia.
D) both near vision and distance vision.

Accepted Answer

Bifocal lenses have two different corrections in one lens, one for near vision and one for distance vision. This allows individuals with presbyopia, which is age-related difficulty in focusing on close objects, to see clearly both up close and far away without having to constantly switch between different pairs of glasses.

Question 5

Michael just turned 45 and is getting glasses for the first time because he has difficulty reading newspapers,telephone books,and the instructions on medicine bottles.His eye doctor diagnosed his vision problem as
A) hyperopia.
B) myopia.
C) astigmatism.
D) presbyopia.

Accepted Answer

Presbyopia is a natural age-related eye condition where the eye loses its ability to focus on near objects. This usually occurs around the age of 40, which is consistent with Michael's age. The symptoms include difficulty reading small print, needing to hold reading materials farther away, and eye strain. Hyperopia (far-sightedness) and myopia (near-sightedness) are usually diagnosed earlier in life, and astigmatism affects the way light enters the eye, causing blurred vision.

Question 6

The rods of the retina
A) are densely packed in an area called the fovea.
B) are specialized for color sensations.
C) function best in dim light.
D) are specialized for picking up on fine detail.

Accepted Answer

Rods are specialized for vision in low light conditions, making them function best in dim light. They are not concentrated in the fovea, which is primarily composed of cones that are responsible for color vision and fine detail.

Question 7

Presbyopia is a condition of the eyes caused by aging in which the person cannot
A) focus on distant objects.
B) see very well in dim illumination.
C) focus on objects near the eyes.
D) see clearly because the lens is pigmented.

Accepted Answer

Presbyopia is a condition in which the lens of the eye becomes less flexible, making it difficult for the eye to focus on nearby objects. This is why people with presbyopia may struggle with activities such as reading or using a computer. They may need to hold reading materials at arm's length to see them clearly. Presbyopia does not impact a person's ability to focus on distant objects or cause issues with pigmentation in the eye.

Question 8

As people become middle-aged,the lens of the eye becomes less flexible and less able to accommodate,resulting in a farsightedness due to aging known as
A) hyperopia.
B) myopia.
C) presbyopia.
D) astigmatism.

Accepted Answer

Presbyopia specifically refers to the age-related loss of accommodation ability in the lens of the eye, leading to farsightedness. Hyperopia and myopia are both refractive errors that can occur at any age, and astigmatism refers to an irregularly shaped cornea or lens, which can cause blurry vision at any distance.

Question 9

Forty-six-year-old Debbie can clearly read the highway signs as she drives,but for the first time in her life,she is having trouble reading the words and numbers in the phone book.Debbie most likely has which vision problem?
A) myopia
B) hyperopia
C) astigmatism
D) presbyopia

Accepted Answer

Presbyopia is a natural age-related condition that affects the ability to focus on close objects or small print, such as phone book text, due to a hardening of the lens in the eye. This is different from myopia (nearsightedness), hyperopia (farsightedness), and astigmatism (irregular cornea curvature) which can affect distance vision as well as close vision.

Question 10

Regarding the retina,which of the following statements is FALSE?
A) The retina consists of many more cones than rods.
B) The retina is an area about the size and thickness of a postage stamp.
C) Only about half of the light falling on the front of the eye ever reaches the rods and cones in the retina.
D) The part of the eye where the optic nerve leaves the eye contains no rods or cones and is known as the blind spot.

Accepted Answer

The retina actually consists of many more rods than cones. There are roughly 20 times as many rods as cones in the human retina.

Question 11

The rods of the retina
A) number about 120 million in each eye and are found mainly in the periphery of the eye.
B) are specialized for color sensations and detecting fine details.
C) function best in bright light.
D) are characterized by all of these.

Accepted Answer

Rods number about 120 million in each eye and are found mainly in the periphery of the eye, serving the function of vision in low light or dark conditions. They are not specialized for color sensations and cannot detect fine details as effectively as cones. Additionally, they function best in dim light, rather than bright light.

Question 12

The type of visual defect that a person experiences with presbyopia is similar to that of a person with
A) color blindness.
B) astigmatism.
C) myopia.
D) hyperopia.

Accepted Answer

The answer of The type of visual defect that a...

Question 13

The part of the eye where the optic nerve leaves the eye is called the
A) lens.
B) retina.
C) blind spot.
D) pupil.

Accepted Answer

The part of the eye where the optic nerve leaves the eye is called the blind spot. It is called the blind spot because it contains no photoreceptor cells, so it cannot detect light.

Question 14

Which receptor cells produce color sensations and fine details,work best in bright light,and lie mainly at the center of the eye?
A) phosphenes
B) rods
C) cones
D) stereocilia

Accepted Answer

Cones are the receptor cells that produce color sensations and fine details, and they work best in bright light. They are mainly concentrated in the fovea, which is at the center of the eye.

Question 15

Black and white vision with the greatest sensitivity under lower levels of illumination describes the function of the
A) cones.
B) rods.
C) phosphenes.
D) visual pigments.

Accepted Answer

The description matches the function of rods, which are responsible for vision in low levels of light and are more sensitive to black and white contrasts than to colors. Cones, on the other hand, are responsible for color vision and require higher levels of light. Phosphenes are a perception of light without external stimulus, and visual pigments are molecules that absorb light and initiate the visual process.

Question 16

As people age,which part of the eye becomes less flexible and less able to accommodate?
A) fovea
B) retina
C) lens
D) iris

Accepted Answer

The lens becomes less flexible and less able to accommodate as people age, leading to presbyopia. This is why many people need reading glasses or bifocals as they get older.

Question 17

Numbering about 120 million in each eye,which receptor cells allow us to see in dim light and are responsible for our seeing black and white images?
A) phosphenes
B) rods
C) cones
D) stereocilia

Accepted Answer

Rods are receptor cells in the retina that allow us to see in dim light and are responsible for our seeing black and white images. Phosphenes are the sensation of seeing light without an actual light source, cones are receptor cells responsible for color vision in bright light, and stereocilia are hair-like structures in the inner ear that detect sound waves.

Question 18

The cones of the retina
A) number about five million in each human eye.
B) are specialized for seeing black and white sensations.
C) occur most commonly in the periphery of the retina.
D) allow us to see in dim light.

Accepted Answer

The cones of the retina number about five million in each human eye.

Question 19

The area known as the blind spot is so named because
A) nerve cells have been permanently damaged.
B) a person no longer has peripheral vision.
C) there are no photoreceptors in this area.
D) there is no activity in the fovea.

Accepted Answer

The blind spot is so named because there are no photoreceptors in this area. This means that any image that falls on the blind spot cannot be registered by the eye and is therefore "blind" to us.

Question 20

The eye has two types of "image sensors," consisting of receptor cells called the
A) iris and pupil.
B) lens and pupil.
C) cornea and the ciliary muscles.
D) rods and cones.

Accepted Answer

The two types of image sensors in the eye are the rods and cones, which are located in the retina. The rods are responsible for detecting light and dark, while the cones are responsible for detecting color. Neither the iris, pupil, lens, cornea, nor ciliary muscles are involved in sensing visual information.

Quiz 4: A: Sensation and Perception

The visual receptors that are used under dim light and produce only black and white sensations are the

When you see colors and bright light,you are using the visual receptors known as

The cones of the retina

Bifocal lenses are used to correct

Michael just turned 45 and is getting glasses for the first time because he has difficulty reading newspapers,telephone books,and the instructions on medicine bottles.His eye doctor diagnosed his vision problem as

The rods of the retina

Presbyopia is a condition of the eyes caused by aging in which the person cannot

As people become middle-aged,the lens of the eye becomes less flexible and less able to accommodate,resulting in a farsightedness due to aging known as

Forty-six-year-old Debbie can clearly read the highway signs as she drives,but for the first time in her life,she is having trouble reading the words and numbers in the phone book.Debbie most likely has which vision problem?

Regarding the retina,which of the following statements is FALSE?

The rods of the retina

The type of visual defect that a person experiences with presbyopia is similar to that of a person with

The part of the eye where the optic nerve leaves the eye is called the

Which receptor cells produce color sensations and fine details,work best in bright light,and lie mainly at the center of the eye?

Black and white vision with the greatest sensitivity under lower levels of illumination describes the function of the

As people age,which part of the eye becomes less flexible and less able to accommodate?

Numbering about 120 million in each eye,which receptor cells allow us to see in dim light and are responsible for our seeing black and white images?

The cones of the retina

The area known as the blind spot is so named because

The eye has two types of "image sensors," consisting of receptor cells called the