Worksheet: Vision and the Eye
In this worksheet, we will practice calculating the power, near and far points, and accommodation of both normal eyes and those requiring correction.
People who do very detailed work close up, such as jewelers, often can see objects clearly at much closer distance than the normal 25 cm. The lens-to-retina distance is 2.00 cm.
What is the power of the eyes of a woman who can see an object clearly at a distance of only 8.00 cm?
What is the image size of an object 1.00 mm long, such as lettering inside a ring, held at a distance of 8.00 cm?
What would the size of the image be if an object 1.00 mm long was held at the normal 25.0 cm distance?
An object with a height of 1.50 cm is held at a distance of 3.00 cm from a person’s cornea. The height of the formed image is 0.157 cm.
What is the magnification of the reflected image?
How far behind the cornea is the image formed?
Find the radius of curvature of the convex lens formed by the cornea.
A laser reshaping the cornea of a myopic patient reduces the power of his eye by 8.0 D, with a 4.0% uncertainty in the final correction. What is the range of diopters for the eyeglass lenses that this person might need after this procedure?
- A 0.32 D, −0.32 D
- B 0.25 D, −0.25 D
- C 0.45 D, −0.45 D
- D 0.37 D, −0.37 D
- E 0.40 D, −0.40 D