LAB 4: Sensory Questions And Answers
BIOLOGY 2020 LAB
LAB 4 – Sensory Systems
I. Vision 1. Know the types of photoreceptors in the retina. (Remember there are 3 different types of cones)
3 cones
i. Blue- short ii. Green- Medium iii. Yellow-Red- Long
2. Why would near point accommodation change as you get older? (Think about what happens to the lens and the muscles of the eye with age)
As you get older, the lens becomes hardened.
The elasticity of the lens decreases dramatically with age, resulting in difficulty in focusing for near or close vision. (presbyopia)
3. Know what cross dominance is and why it may occur or be beneficial.
Cross dominance is when your dominant eye is on the opposite side of your body than your dominant hand. This is thought …show more content…
Know where the olfactory bulbs (for smell, locate on bottom part of brain protected by cribiform), optic nerve, and optic chiasm are. Know the path that axon tracts follow from the retina, to the occipital lobe of the brain. Think about what would happen to your vision if specific tracts were cut along the path from the retina to the occipital lobe. What visual deficits would you experience if you cut the tract at the right or left optic nerve, optic chasm, or lateral axons extending from the occipital lobe?
The optic nerve carries information from the retina to the occipital lobe of the brain, where it is ultimately processed and gives you the phenomenon of vision. The medial portions of your retinas have axons that cross over to the other side of the body at the optic chiasm, meaning that if you cut the left optic tract of the brain, you would be blind in your right visual field of your right eye, and blind in the left visual field of your left eye. You should just understand the anatomy of the visual tracts of the brain, meaning the eye, retina, optic nerves, chaism, tracts, and occipital lobes of the …show more content…
Inherited as an X linked condition, its far more common in males than in females. As many as 8-10% of males have some form of color blindness.
12. Know the difference and what causes near sightedness and far sightedness.
Myopia is near sightedness, caused by image being focused on the front of the retina. Close objects are viewed fine but distant objects are blurred or seen indistinctly. A concave lens is used to correct this by causing the light reaching the eye to diverge.
Hyperopia is far sightedness, caused by image focusing behind the retina. Uses convex lenses to augment the converging power of the lens for close vision.
13. Know what an after image is, and why you see it the way you do.
When our eyes are exposed to a hue for a prolonged period, the rods & cones become fatigued. You might notice this if you are reading something on colored paper, and then look away—you often see the inverse, or complement, of the image. This occurrence can be advantageous if you are seeking the opposite, or contrast, of a color. This may be dismaying to a viewer if presented with prolonged exposure to colored screens or reading
LAB 4 – Sensory Systems
I. Vision 1. Know the types of photoreceptors in the retina. (Remember there are 3 different types of cones)
3 cones
i. Blue- short ii. Green- Medium iii. Yellow-Red- Long
2. Why would near point accommodation change as you get older? (Think about what happens to the lens and the muscles of the eye with age)
As you get older, the lens becomes hardened.
The elasticity of the lens decreases dramatically with age, resulting in difficulty in focusing for near or close vision. (presbyopia)
3. Know what cross dominance is and why it may occur or be beneficial.
Cross dominance is when your dominant eye is on the opposite side of your body than your dominant hand. This is thought …show more content…
Know where the olfactory bulbs (for smell, locate on bottom part of brain protected by cribiform), optic nerve, and optic chiasm are. Know the path that axon tracts follow from the retina, to the occipital lobe of the brain. Think about what would happen to your vision if specific tracts were cut along the path from the retina to the occipital lobe. What visual deficits would you experience if you cut the tract at the right or left optic nerve, optic chasm, or lateral axons extending from the occipital lobe?
The optic nerve carries information from the retina to the occipital lobe of the brain, where it is ultimately processed and gives you the phenomenon of vision. The medial portions of your retinas have axons that cross over to the other side of the body at the optic chiasm, meaning that if you cut the left optic tract of the brain, you would be blind in your right visual field of your right eye, and blind in the left visual field of your left eye. You should just understand the anatomy of the visual tracts of the brain, meaning the eye, retina, optic nerves, chaism, tracts, and occipital lobes of the …show more content…
Inherited as an X linked condition, its far more common in males than in females. As many as 8-10% of males have some form of color blindness.
12. Know the difference and what causes near sightedness and far sightedness.
Myopia is near sightedness, caused by image being focused on the front of the retina. Close objects are viewed fine but distant objects are blurred or seen indistinctly. A concave lens is used to correct this by causing the light reaching the eye to diverge.
Hyperopia is far sightedness, caused by image focusing behind the retina. Uses convex lenses to augment the converging power of the lens for close vision.
13. Know what an after image is, and why you see it the way you do.
When our eyes are exposed to a hue for a prolonged period, the rods & cones become fatigued. You might notice this if you are reading something on colored paper, and then look away—you often see the inverse, or complement, of the image. This occurrence can be advantageous if you are seeking the opposite, or contrast, of a color. This may be dismaying to a viewer if presented with prolonged exposure to colored screens or reading