Type of Vision
Normal Vision
Nearsighted 1
Nearsighted 2
Farsighted 1
Farsighted 2
Needs Bifocals
User Defined
Corrective Lens Power
<
>
Value:
0
m
-1
Zoom Screen
Smaller (−);
Larger (+)
What the eye sees
0.01 m
0.10 m
1.0 m
10 m
Logarithmic Scale
normal
nearpoint
1.000 m
Instructions
Move the arrow to find the person's nearpoint and farpoint by observing if the
image and/or background that the eye sees becomes blurry.
The size of the image is not to scale.
Find the power of corrective lens that lets nearsighted people see distant
objects clearly.
Find the nearpoint of the nearsighted person with the corrective lens.
Find the power of corrective lens that lets farsighted people see objects at the
the normal nearpoint.
Find the farpoint of the farsighted person with the corrective lens.
For a person who needs bifocals, find the powers to see objects at the normal
nearpoint and to see distant objects clearly.
User Defined option lets you select nearpoint and farpointy.
