Question

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.

Answer #1

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.

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 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 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?

A person's left eye has a near point of 43 cm and requires
eyeglasses to correct their vision.
a) What would the prescription for the left eye?
b) A 9.0 mm base curve (radius of curvature) will best fit the
person's cornea. Using the material with index of refractive 1.422,
what should be the radius of curvature (include the correct sign)
fo the other side of the lens?
c) What is their new far point after wearing the contact
lens?

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=________...

Without her glasses, Dr.D.’s myopic eyes can only image objects
that are, at most, 18.5cm awayfrom her eye(this is called her “far
point”). Her “near point” (the closest she can image an object) is
10.5 cm from her eye. With this range of vision, she obviously
needs glasses. Let’s say we want her glasses to allow her to see an
object 20 feet away(not really the same as “20/20” vision.... but
close enough).
You also need to note her glasses...

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....

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