Slide 29
Notice geese are clear but the city is blurry.
Slide 30
Hyperopia
An eye that is too short, or a cornea that is not steep enough causes hyperopia (or Farsightedness). People with hyperopia see blurry when looking at close objects. Young people can slightly overcome hyperopia by using their focusing muscles to make the image clear. This gets harder as they get older. Currently, there are restricted options to correct hyperopia. Most operations are still under development.
Slide 31
What is blurry this time?
Slide 32
The human eye can change the shape of the lens automatically.
The range of change that the lens can accomplish varies from person to person.