Question

1. A person has refractive hypermetropia with a near point at 3 m. They are to be prescribed a set of glasses that will enable them to have normal close-in vision and the person’s glasses will typically sit 2 cm in front of their eyes. (a) What is the maximum optical power of this person’s eyes? (b) What is the optical power of the glasses required?

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.

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=________...

The near point of a patient's eye is 54.2 cm.
(a) What should be the refractive power ℛ of a
corrective lens prescribed to enable the patient to clearly see an
object at 23.0 cm?
ℛ = dpt
(b) When using the new corrective glasses, the patient can see an
object clearly at 26.8 cm but not at 23.0 cm. By how many diopters
did the lens grinder miss the prescription?
? = dpt

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.

A person is farsighted and has near point of 50 cm. Retina is at
a distance L = 1.7 cm. When wearing contact lenses and reading a
book 30 cm in front of the eye, what is the object distance for the
lenses? What is the desired image distance? Is the magnitude of the
image distance a minimum, maximum, or the only acceptable image
distance? Find the focal length and refractive power of the contact
lens that will fix this...

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 near-sighted person has a far point of 75cm. That person gets
corrective glasses, which rest 2cm from their eyes, in order to
give them a normal far point that is infinitely far away.
However, those corrective lenses don't just change the person's
far point. While wearing their glasses, what is this person's new
near point (assume that without glasses, their near point is the
normal 25cm)?

A near-sighted person has a far point of 95cm. That person gets
corrective glasses, which rest 2cm from their eyes, in order to
give them a normal far point that is infinitely far away. However,
those corrective lenses don't just change the person's far point.
While wearing their glasses, what is this person's new near point
(assume that without glasses, their near point is the normal
25cm)?)

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?

(a) Where is the near point of an eye for which a contact lens
with a power of +2.95 diopters is prescribed?
cm (in front of the eye)
(b) Where is the far point of an eye for which a contact lens with
a power of -1.35 diopters is prescribed for distant vision?
cm (in front of the eye)

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