Download - Eyesight
- 1. Long Distance Short Distanceeyesight
By: Aaliyah HIbbler
2. Introduction
Many people may not realize it, but eyes are very sensitive.They
adjust based on focus, light, distance, and other variables.How
does this change when we get older?Does it become harder to switch
between seeing things up close and seeing them far away?
3. Materials
Eye Chart
Paper
Pencil
4. Objective
The purpose of this experiment is to determine how age affects the
speed that someone can change the focus of their eyes between near
sightedness and far sightedness.
5. Research questions
- How do eyes work?
Eyes work when light recoil off of an object and into the
eyeball. Through refraction of light and the lens of the eyeball
the brain examines what it sees.
- Does eyesight change with age?
Yes, because as we age the lens in our eyes gradually becomes
harder. This makes it more difficult to focus. Sometimes the
muscles of the eye also weaken over time, which can also make it
harder to focus on what you are looking at. This relates to both
things that are close to you and things that are further away
6. What is the difference between far sightedness and short
sightedness?
7. Hyperopia
Farsightedness is a vision fault caused by an imperfection in the
eye (often when the eyeball is too little or when the lens cant
become round enough), causing incapability to focus on near
objects, and in intense cases causing a victim to be incapable to
focus on items at any distance. As an object shifts toward the eye,
the eye must amplify its power to keep the image in focus on the
retina. If the power of the cornea and lens is deficient, as in
hyperopia, the image will come into view blurred.
8. Myopia
Short-sightedness, is a refractive imperfection of the eye in which
collimated light produces image focus in front of the retina while
the eyes are relaxed. Those with myopia see nearby objects clearly
but distant objects appear blurred. With myopia, the eyeball is too
long, or the cornea is too steep, so images are focused in the
vitreous inside the eye rather than on the retina at the back of
the eye.
9. Experimental Procedure
Find a collection of subjects willing to partake in this
experiment.(Subjects from different agessome over 40, some in their
teens, some younger than that, some over 60, etc.)
Make sure that these subjects know that when they show up, they are
allowed to have glasses (NOT bifocals)-They do not take the glasses
off while reading something close.
Direct an eye exam from a poster that is suspended far away.
Give your partakers a break.
Manage a second eye exam from a book that is near.
Independently, make every member take an eye exam from a poster
hung far away, then quickly shift to reading the book close
up.Measure how long it takes for them to make this shift.a. In
addition, count the number of mistakes made while these
charts.
10. Hypothesis
I think that the vision of the younger members will be stronger
than the older. members.
11. Results
The nine year old made four mistakes reading far and no mistakes
reading near.
The fifteen year old made two mistakes reading far and no mistakes
reading near.
The thirty-five year old made one mistakes reading far and no
mistakes reading near.
The fifty-one year old made no mistakes reading far and seven
mistakes reading near.
The seventy-five year old made five mistakes reading far and four
mistakes reading near.
The older the person was the more mistakes were made. This also
shows the difference in the visions some members were far sighted
and some were near sighted
12. Reference
- www.ask.com 13. www.google.com 14. www.yahoo.com
Thank you
AALIYAH HIBBLER