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Lifehack

life hacks

лайфхак

фокусное расстояние

оптическая сила

очки

линза

диоптрия

мениск

лупа

межцентровое

своими руками

DIY

handmade

homemade

оптическая ось

оптический центр

00:00:04

Good health to friends!

00:00:06

This is dedicated to all life hacking, bespectacled Homebrew!

00:00:09

And today we are going to measure the optical power of the eyeglass lens and the center distance.

00:00:15

For this we need: a sheet of paper, a ruler, a coil of thread and a smartphone with a backlight.

00:00:22

If it is required to measure and negative spectacle lenses,

00:00:26

you'll have to stock up on some more magnifying glass and rubber ring.

00:00:30

Let's start!

00:00:33

At one end of the room we fix a piece of paper on a vertical surface

00:00:37

in any convenient manner.

00:00:39

Next we call the target list.

00:00:43

At the other end of the room or hallway on the same floor level, establish phone,

00:00:50

so much so that the target plane is perpendicular to the direction of the light source.

00:00:56

Measure the distance from the target to the phone with the help of thread.

00:01:01

And then measure the length of thread and write the result.

00:01:05

To improve the accuracy of measurement,

00:01:08

not bad in any way to fix line and send it to the side of the smartphone.

00:01:14

Now we take our collecting eyeglass lens

00:01:18

and will focus the LED light on the target.

00:01:21

We define the distance between the lens edge and the target

00:01:26

with a ruler and write down the result.

00:01:29

Povernёm points to 180 degrees and then will focus the same lens.

00:01:35

We define the distance from the target to the same edge of the lens

00:01:40

and fix the second result.

00:01:43

For ease of calculation, downloaded from the description of video archive,

00:01:48

which is a portable program "Calculator Notebook" and a template for calculating the lens.

00:01:55

Unpack the archive to any disk directory, for example, on your desktop.

00:02:00

"Calculator Notebook" to run the program.

00:02:04

Open a text document and copy the template window to calculate the collecting lens.

00:02:12

Adding to the condition of the problem three previously saved measurement results in meters.

00:02:19

This distance from the light source to the target and the two results are obtained when the focusing lens.

00:02:28

Nazhmёm the key Enter, to calculate the optical power in diopters.

00:02:34

To measure the optical scattering power of the spectacle lens,

00:02:38

We will use the additional converging lens - magnifying glass

00:02:43

which has known more than diopters with a plus sign, than the spectacle lens with a minus sign.

00:02:50

This can be checked and by eye.

00:02:53

Put together, these lenses should increase subjects.

00:02:58

When the loop is picked up, you can start the measurements.

00:03:03

First will focus magnifying glass in one direction and write the result.

00:03:09

Then povernёm it 180 degrees and re-fix the distance.

00:03:15

At the same time, we will focus strictly on one and the same edge of the magnifying glass.

00:03:20

Now we construct the optical system of the negative spectacle lens and magnifier,

00:03:26

securing a magnifying glass on the rim of glasses of plain rubber band.

00:03:31

Again proizvedёm two metering focus distance,

00:03:35

Using the same edge of the optical system for recording of the results.

00:03:42

Copy the calculation template negative lens of a text document in the calculator window.

00:03:50

Vnesёm to the same measurements. They have to be five.

00:03:55

The distance between the light source and the target.

00:03:59

Two measurement for magnifying glass.

00:04:01

And two optical measurement system consisting of a magnifying glass and a diffusing lens.

00:04:08

Nazhmёm Enter and get the result in diopters with a minus sign.

00:04:14

In case of discomfort when wearing glasses,

00:04:18

You can check the correctness of the lens unit.

00:04:22

Focusing once both lenses on the target, making sure,

00:04:27

that the optical power of the lens is the same.

00:04:30

As you can see, in this case, it is not so.

00:04:33

In bifocals master use different lenses for distance, and the same for reading.

00:04:40

This happens when the master to get rid of unpaired lens.

00:04:45

Now measure the distance between the optical axes of the lenses.

00:04:50

We fix on the target line and will focus both spectacle lenses.

00:04:55

Record the distance between the points of light and the distance between the rim and the target.

00:05:02

Referring again to our calculator and a copy to a template for calculating the center distance.

00:05:10

Then vnesёm distance to the light source, the distance between the target and the rim,

00:05:16

as well as the distance between the points of light.

00:05:20

Nazhmёm Enter and get a result.

00:05:23

In order to download the recipes and forms the table for the control of visual acuity and selection of glasses,

00:05:29

click on the link in the video description.

00:05:32

There you will find an article where this material is illuminated much more widely.

00:05:37

Thank you for attention!

00:05:39

And the exact measurements of your friends!

Description:

Скачать архив с программой «Калькулятор-блокнот» и шаблон для расчёта линз: https://oldoctober.com/pics/tech/glasses_test/calculator_and_tamplate.zip Связанная статья, в которой дано более подробное описание процесс замера и расчёта оптической силы и расстояния между оптическими осями очковых линз: https://oldoctober.com/ru/glasses_test/ ============================================ Тема этой этого ролика и связанной статьи – измерение оптической силы положительных и отрицательных очковых линз, и межцентрового расстояния в домашних условиях. И те, и другие параметры нужны, как для составления рецепта, так и для выявления дефектов очков при ощущении дискомфорта. Пролог Недавно мне потребовалось срочно заказать бифокальные очки для работы, а для этого потребовался рецепт. Идти к врачу было хлопотно и дорого. Да и измерения, сделанные впопыхах, вовсе не гарантировали идеальный результат, в чём я уже не раз убеждался. По сути ведь приходится платить за то, что у врача есть набор линз и линейка. В кабинетах же, оснащённых современным оборудованием, тарифы и вовсе какие-то заоблачные, хотя результатом является всё тот же небольшой клочок бумаги. :) Но, ведь некоторый набор линз и линейка обычно имеются у каждого очкарика с многолетним стажем, особенно, если вдобавок он ещё и самодельщик. В спокойной, домашней обстановке, подобрать линзы несложно, но как определить оптическую силу линз, чтобы можно было заполнить рецепт? Конечно, можно было бы напрячься и узнать местонахождение мастерской, где врезают линзы в оправы, а потом попытаться за некоторую плату измерить все свои линзы на линзметре (диоптриметре). Но, я всё же решил сделать всё своими руками, поэтому первым делом отправился в Интернет, чтобы найти инструкцию по замеру этого параметра в домашних условиях. Но, как часто бывает, советы умозрительных специалистов из сети оказались полностью неработоспособными. Так что, пришлось разрабатывать собственную технологию подобных измерений. Результатом этих трудов стала данная статья и новые бифокальные очки, которые совершенно не утомляют ни глаза, ни голову. Кроме этого, я узнал почему некоторые очки не прижились у меня на носу. А теперь обо всём этом подробнее: https://oldoctober.com/ru/glasses_test/

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