Question

A nearsighted man uses his ideally prescribed contact lenses that have a refractive power of ?2.20 diopters. He would like a prescription for eyeglasses. What is the correct eyeglasses prescription if he wears his eyeglasses a distance of 2.70 cm from his eyes?

Answer #1

A nearsighted man uses his ideally prescribed contact lenses
that have a refractive power of ?3.80 diopters. He would like a
prescription for eyeglasses. What is the correct eyeglasses
prescription if he wears his eyeglasses a distance of 2.20 cm from
his eyes?
in diopters

7. A farsighted man uses contact lenses with a
refractive power of 1.95 diopters. Wearing the contacts, he is able
to read books held no closer than 0.255 m from his eyes. He would
like a prescription for eyeglasses to serve the same purpose. What
is the correct prescription for the eyeglasses if the distance from
the eyeglasses to his eyes is 0.025 m?
_________ diopters

A farsighted man uses eyeglasses with a refractive power of 3.13
diopters. Wearing the glasses 0.023 m from his eyes, he is able to
read books held no closer than 0.260 m from his eyes. He would like
a prescription for contact lenses to serve the same purpose. What
is the correct contact lens prescription, in diopters?

A farsighted man uses eyeglasses with a refractive power of 3.01
diopters. Wearing the glasses 0.027 m from his eyes, he is able to
read books held no closer than 0.270 m from his eyes. He would like
a prescription for contact lenses to serve the same purpose. What
is the correct contact lens prescription, in diopters?

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

A person's prescription for his new bifocal eyeglasses calls for
a refractive power of -0.0600 diopters in the distance-vision part
and a power of 1.05 diopters in the close-vision part. Assuming the
glasses rest 2.00 cm from his eyes and that the corrected
near-point distance is 25.0 cm, determine the near and far points
of this person's uncorrected vision.

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.

Contact lenses are placed right on the eyeball, so the distance
from the eye to an object (or image) is the same as the distance
from the lens to that object (or image). A certain person can see
distant objects well, but his near point is 50.0 cm from his eyes
instead of the usual 25.0 cm .
Part A
Is this person nearsighted or farsighted?
Is this person nearsighted or farsighted?
This person is nearsighted.
This person is farsighted....

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?

Alyssa has always been mildly nearsighted, but as she’s gotten
older, her eyes have lost some of their ability to accommodate to
focus on close objects. She now has a far point of 2 m and a near
point of 1 m; Alyssa needs a prescription for bifocals. The outer
rim of her lenses will have a refractive power that will allow her
to focus on distant objects; the center of her lenses will have a
different refractive power that...

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