2.4.2 Eye test
Given that the previous question asks about family members and color perception deficiency, what can you infer about the development of this condition?
Sex-linked trait(on X chromosome)
Some cities hang their traffic lights from left to right, rather than from top to bottom. Explain why this might cause a problem for a driver with red-green perception deficiency.
The colors would blend together so they would not know when to go or stop
Your friend swears that no one can possibly have better than 20/20 vision. Use what you have learned about the Snellen eye examination chart and what numbers such as 20/20 really mean to set him/her straight.
This means that the person sees the same lines of letters at 20ft than a normal person sees at 20ft. 20/30 means that the person sees at 20 ft is what normal people see at 30 ft
Describe what needed to occur for the distant object to be in focus. How does this relate to what actually happens in the human eye?
When you squint the lens changes shape which allows for less light to come in which sharpens the image
What happens to the image when you focus the eye on a distant object? This is what a nearsighted person sees when they look at a distant object.
blurred
What does a far-sighted person see when he/she looks at near objects?
blurry
To correct hyperopia, is it necessary to move the image formed by the eye closer or farther away from the eye's lens system? Does this require a convergent or divergent lens? NOTE: Information about lenses is found on the station instructions, but you may do some Internet research to help you answer
bring it closer, convergent is required
This is what a nearsighted person sees when looking at a near object
clearly
Explain what happens in the eye to cause an afterimage.
cons are fatigued so less cones means you see other colors
Explain the specific roles of rods and cones in the eye.
cons-color and sharpness rods-dark colors (blacks,grays and whites)
List several careers or activities in which depth perception plays an important role.
driving and swimmings
To correct myopia, is it necessary to move the image formed by the eye closer or farther away from the eye's lens system? Does this require a convergent or divergent lens?
father away. requires divergent
What happens to the clarity of the image when you decrease the pupil size? How does this relate to squinting?
it sharpens due to less light in eye
What is accommodation in the eye? How are muscles involved in this process?
keeps lens and focal point distance constant
Is the image of the picture you drew inverted? Turn the picture upside down. How does the image look now?
looks upside down
Does a far-sighted person have trouble seeing distant objects? Why was it not necessary to change the lens to look far away
no because its behind the retina
Since the image on the retina is inverted, why don't we see things upside down?
the brain flips it (occipital lobe)
Explain the importance of the fovea centralis to your 9-year-old sister.
the fovea centralis is important for sharp/clear vision. She needs it for writing/reading and watching tv
Explain what is happening in the eye to cause astigmatism. How does this impact how you see?
the lens is irregularly shapes causing light to refract all over the eye causing blurry and bolded lines
If we have three different types of cones - red cones, blue cones, and green cones - how do we see such a wide range of colors?
they blend together to make more colors
What structure in the eye does the water represent? Explain the function of this liquid.
ultrasis->nutritious it aqueous-> keeps it in place