Question

A severely nearsighted person has a far point of 7.10 cm. By how many diopters should the power of the eyes be reduced when laser vision correction is performed on this person?

Answer #1

For a nearsighted person , far point is

So image distance from the lens is

And object distance from the lens is

Thin lens formula

Focal length of lens is

Power of lens needed is

A myopic (nearsighted) person has a far point distance of 150
cm. What is the refractive power of his ideally prescribed
eyeglasses if he wears his eyeglasses a distance of 3.0 cm from his
eyes?
Answer in dp

QUESTION: A person has a near point of NP = 95 cm and a
far point of FP = 155 cm. The person wishes to obtain a
pair of bifocal eyeglasses to correct these vision problems. The
glasses will sit a distance d = 1.6 cm from the eyes.
A)Write a formula for the power, P1, of the
upper portion of the bifocals, in terms of the given quantities,
that will enable the person to see distant objects clearly.
P1=________...

A nearsighted person has a far point located only 202 cm from
his or her eyes.
a) write the equation to find the focal length
b) Solve the above equation
c) Find the power of the lens
d) If this person went to the pharmacy to the area where the
glasses are located, which of the two towers of glasses should they
be standing in front of? Negative or Positive

A person is having trouble seeing. Bifocals should be prescribed
for him. His far
point is 135 cm. The normal far point is infinity. His near point
is 79.0 cm, but he would
like to hold a book 20 cm from his eyes. What two lenses (with
power in diopters)
should be prescribed?

1.
A nearsighted person has a far point of 21 cm. To correct the
distant vision using a lens 2 cm from the eye. What power lens
should be used?
1. 4.8 D
2. -4.8 D
3. 5.3 D
4. -5.3 D
2. The speed of light in a plastic material is 1.5*10^8 m/s.
The index of refraction of this material is
A. 2
B.1.54
C. 1.33
D. 0.81
3 if light of wavelength 600 nm in air enters a...

A person has a far point of 27 cm and a near point of 12 cm. Her
eyeglasses are 2 cm from her eye. What power lenses must be
prescribed to correct this person's vision?

A girl calculated that the prescription for her contact lenses
should be -4.66 diopters. What is the farthest distance (far point)
from her eyes that she can see clearly when she is not using any
vision correction? (State answer in centimeters with 1 digit to
right of decimal.)

A patient's far point is 135 cm and her near point is 15.0
cm.
In what follows, we assume that we can model the eye as a simple
camera, with a single thin lens forming a real image upon the
retina. We also assume that the patient's eyes are identical, with
each retina lying 1.95 cm from the eye's "thin lens."
(a)
What is the power, P, of the eye when focused upon the
far point? (Enter your answer in...

A near sighted person has a near point of 12 cm and a far point
of 40 cm. What power corrective lens is needed for her to have
clear distant vision? With this corrective lens in place, what is
her new near point?

Suppose that a person's lenses have a refractive power of 2.75 diopters that allow the person to focus on an object that is 25 cm from the eye. The glasses are 2.00 cm in front of the eyes.
a) Is the close point of this person greater than or less than 57.0 cm? What is the distance from the near point when the glasses have a refractive power of 2.53 diopters? Explain b) find the close point of this person.

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