Warning: foreach() argument must be of type array|object, bool given in /var/www/html/web/app/themes/studypress-core-theme/template-parts/header/mobile-offcanvas.php on line 20

The contact lens prescription for a nearsighted person is -4.00 D and the person has a far point of 22.5 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?

Short Answer

Expert verified

The power of the tear layer is -0.444 D.

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

PLens= -4.00 D

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

P=1fP=1d0+1di………….(1)

03

What is the power of the tear layer?

Rearrange the distance between the far point and the person's eyes and solve for it:

Equation (1) is obtained by substituting data values.

P=1d0+1di=10.02m+10.225m=54.444D

The regular eye's power is 50 D, as we all know. We use the following relationship to determine the normal eye's power:

PNormal=PTear+PCalc+PLensPTear=PNormal-PCalc-PLensPTear=50D-54.444D--4DPTear=-0.444D

Therefore, the power of the tear layer is -0.444 D.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Study anywhere. Anytime. Across all devices.

Sign-up for free