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Chapter 26: Q22PE (page 956)

: A mother sees that her child鈥檚 contact lens prescription is 0.750 D. What is the child鈥檚 near point?

Short Answer

Expert verified

The child's near point is -0.308 m.

Step by step solution

01

How do contact lenses work?

Contact lenses operate by bending light to bring it into focus on the retina, where vision receptors collect data and send it to the brain.

02

Given information and Formula to be used

P= 0.750 D

You know that the near point for a normal relaxed eye is 0.25 m.

The power of the lens is equal to the reciprocal of the focal length is :

P=1fP=1d0+1d1

03

What is the child's near point?

Rearrange the distance between the close point and the child's eyes and solve for it:

Equation (1) is obtained by substituting data values.

1d0=P-1did0=P-1di=10.750D-10.25md0=-0.308mTherefore,accordingtotheresult,thechild'snearpointis-0.308m.

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Most popular questions from this chapter

A very myopic man has a far point of 20.0 cm. What power contact lens (when on the eye) will correct his distant vision?

If the cornea is to be reshaped (this can be done surgically or with contact lenses) to correct myopia, should its curvature be made greater or smaller? Explain. Also explain how hyperopia can be corrected.

The far point of a myopic administrator is 50.0 cm. (a) What is the relaxed power of his eyes? (b) If he has the normal 8.00% ability to accommodate, what is the closest object he can see clearly?

A microscope with an overall magnification of 800 has an objective that magnifies by 200.

(a) What is the magnification of the eyepiece?

(b) If there are two other objectives that can be used, having magnifications of 100 and 400, what other total magnifications are possible?

A person with presbyopia has lost some or all of the ability to accommodate the power of the eye. If such a person鈥檚 distant vision is corrected with LASIK, will she still need reading glasses? Explain.
See all solutions

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