Eyeglasses Smart Choice

By Infoptix

A book explaining vision disorders, ophthalmic prescriptions, the different types of lenses and the materials used to make them, the different treatments, the various shades, how lens size affects lens thickness, situations faced when consulting for new glasses. Three demonstrations are available to be used. Also covered are the different facets used to sell you glasses, which do not specifically meet your expectations, but which make sure to meet the distributor's. Knowing what subtleties are put in place, you'll be better able to cope with them, to ensure that your ophthalmic eyeglasses meet your financial and visual needs.

• Language: English
• Publisher: Infoptix
• Release date: Dec 13, 2018
• ISBN: 9781999540623

Book preview

Eyeglasses Smart Choice

Published by Infoptix at Smashwords

Copyright 2018 Infoptix

Smashwords Edition, License Notes

This ebook is licensed for your personal enjoyment only. This book may not be re-sold or given away to other people. If you would like to share this book with another person, please, purchase an additional copy for each recipient. If you are reading this book and did not purchase it, or if it was not purchased for your own use only, then please return to your favorite ebook retailer and purchase your own copy. Thank you for respecting the hard work of this author.

Table of content

Introduction

Vision

Myopia

Hyperopia

Astigmatism

Diplopia

Presbyopia

Prescription

Ophthalmic frames materials

Metals

Plastics

Others

Ophthalmic frames shapes

Ophthalmic lenses materials

Ophthalmic lens types

Single vision

Bifocals

Specialty lenses

Lenses explained

Measures

Ophthalmic lenses treatments

Ophthalmic lenses shades

Situations to consider

References

Introduction

The main purpose of this book is to help you make a smart choice when you acquire your next visual orthosis.

Having worked in the optical field as a professional for several years, I decided to share with you different facets of the vision and the ways used to correct it.

Not being tied to any dispensary, clinic, office or optical company at the time of this writing, I feel free to share my knowledge with you. I will also share some of the practices used when selling these items.

Only corrective eyeglasses data will be discussed, contact lenses and refractive surgeries are another area of practice, however, these solutions should not be put aside and may be very practical for many.

It should be noted that a pair of eyeglasses is not a therapeutic tool, but a good corrector. It does not improve the vision to the point where we could stop wearing and have found a perfect vision. The only events where they could have a therapeutic effect is when it is used for a young person (infant) suffering from strabismus, in this case it could have the effect of forcing one or more of the six muscles surrounding the eyeball, to make it more adapted to the functions assigned to it. If the muscle strengthens, it will have the effect of avoiding surgery that could allow the eyeball to find the proper place to provide a balanced vision.

So eyeglasses are prescribed and worn to improve vision. In fact it would not allow the eye to self-compensate, we wear it we can see if not worn the vision becomes blurred.

In the chapters that follow, the different problems of vision and the lenses used to correct them will be discussed, including Rx, the different materials of which the lenses are made of, the effects of the size of lens required to make glasses according to the prescription, the measures and their functions, the different treatments, the colors as well as various elements to take into account to have the best orthosis for your needs.

Vision

Myopia

Myopia is a vision disorder where the person sees blurred afar.

The image of a point is no longer a point but a spot on the retina, the perception of a distant object is fuzzy. The further the object is, the more it is fuzzy (depending on the value of myopia).

All in all, the myopic sees far less than near. This can be corrected by glasses, contact lenses or refractive surgery.

The focus of an object located at the infinite is in front of the retina. The image that will impress the retina will be more spread out and more blurred.

Hyperopia

Hyperopia also known as ar-sightedness is a vision disorder. From a pure optical point of view, hyperopia is the opposite of myopia: when the eye is at rest, it gives a distant object, an image that would be focused behind the retina.

Hyperopia can be corrected with converging lenses.

The light rays obviously can not cross the eye wall: it is only theoretically that the image is focused behind the retina.

« At rest », that is to say without the intervention that accommodation allows, as much as possible (see presbyopia), to increase the power of the optical system of the eye, accommodation brings back the image formed behind the retina on the latter.

In the absolute, the eye, always at rest (without accommodation), would see the objects all the more fuzzy as they get closer.

Astigmatism

Defect of optical systems that do not give a dot a point image, but an image spread in the anteroposterior direction.

Normally, the surfaces of the cornea and lens