Book edition 1st Edition

Author(s) Paul Peter Urone

Pages 1272 pages

ISBN 9781938168000

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Short Answer

A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?

The power of his eye must be reduced by 20.0 D.

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Step by Step Solution

TABLE OF CONTENTS :

TABLE OF CONTENTS

Step 1: Definition of dioptre lens

The unit of measurement for the optical power of a lens or curved mirror is the dioptre of power of a lens, which is equal to the reciprocal of focal length.

Step 2: Given information and Formula to be used

The lens-to-retina distance is, $d_{i} = 2.00 c m (\frac{1 m}{100 c m}) = 0.02 m$ .

The far point for the myopic patient is, $d_{\circ} = 5.00 c m (\frac{1 m}{100 c m}) = 0.05 m$ .

The power of a normal person is P = 50 D

The power of the severely myopic eye P_myopic can be obtained using:

$P_{m y o p i c} = \frac{1}{d_{0}} + \frac{1}{d_{i}}$ ...............(1)

And, the number of diopters P_Corrected can be obtained using,

$P_{C o r r e c t e d} = P_{M y o p i c} - P_{N o r m a l}$ .................(2)

Step 3: By how many diopters should the power be reduced?

Substitute values in equation (1) and it gives,

$P_{m y o p i c} = (\frac{}{0.05 m}) + (\frac{1}{0.02 m}) \dots \dots \dots \dots \dots \dots (3) = 70 D$

Substituting data from equation (3) in equation (2), which gives,

$P_{C o r r e c t e d} = 70 D - 50 D = 20 D$

Therefore, the power of the eye must be reduced by 20 D.

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College Physics (Urone)

Answers without the blur.

Short Answer

A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?

Step by Step Solution

Step 1: Definition of dioptre lens

Step 2: Given information and Formula to be used

Step 3: By how many diopters should the power be reduced?

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College Physics (Urone)

Answers without the blur.

Short Answer

A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?

Step by Step Solution

Step 1: Definition of dioptre lens

Step 2: Given information and Formula to be used

Step 3: By how many diopters should the power be reduced?

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