Finally, a properly calibrated myopia tester

Allows you to test both far and near vision with the same measurement method and scale on a handy hand-held panel
with built-in backlight and as many as 4 types of Optotypes. 2 front and 2 rear.

It's that simple with vision charts from Danish ISOeyes:

With farsightedness and nearsightedness charts from ISOeyes, you can easily screen for both farsightedness and nearsightedness by using the two types of charts: the distance chart and the nearsightedness tester in combination. The two charts are precisely calibrated in relation to each other, so the test only differs by viewing distance. It provides the optimal basis for valid vision measurements.

Signs of myopia:
If you achieve a better vision result on the near vision chart at a reading distance of 30 cm than on the distance chart at e.g. 3 meters distance, yes, then you are probably nearsighted. The degree of this determines whether the screening triggers a trip to the ophthalmologist/optician.

Signs of long-sightedness:
Do you achieve that inferior vision result on the near vision chart at a reading distance of 30 cm than on the distance chart at e.g. 3 meters distance, yes, then you are probably far-sighted. The degree of this determines whether the screening triggers a trip to the ophthalmologist/optician.

For preschool and school children, the limit value is LogMAR 0.2

No more cryptic flawed near vision tests.

This way of calculating farsightedness and nearsightedness problems is due precisely to the fact that we are talking about two test situations which are calibrated in relation to each other.
We are not talking about radically different test environments such as when the near vision test consists of a "Jaeger" card with completely different measurement units and lines of text.... Instead, we have a test where the only difference in the test environment is the distance to the vision chart.

Read more about nearsightedness and farsightedness below….

How to determine whether you have challenges with nearsightedness or farsightedness.

  • CAN you on the myopia tester clearly see the symbols at a distance of at least 30 centimeters the red LogMAR 0.0 line (Equivalent to 6/6 or decimal 1.0), while on the distance chart you can only see the line with the value LogMAR 0.2 or worse (6/9  and decimal 0.63) – it points to you being nearsighted.
  • Can you, on the other hand, on the myopia tester  at a distance of 30 centimeters only just see the symbols on the line LogMAR 0.2, while on the distance chart you achieve a better result and CAN se the line with the value LogMAR 0.1 or better – it points to you being short-sighted.

It is more important than ever to test for myopia.

Approximately one in five Danish children suffers from myopia, and this is an increase from previously. Severe myopia is associated with serious eye complications, and the extreme increase in children's screen time on iPads and mobile phones has been identified as a major factor in this unfortunate development.

 

 

Myopia can lead to fatigue, irritation and headaches due to difficulty seeing objects at a distance.

There should be no difference between how distance and near vision charts are constructed!

A vision chart for measuring nearsightedness, (myopia), should basically be constructed in the same way as the ordinary vision chart. However, the simple basic rule has surprisingly rarely been followed in the design of near vision charts.

An ordinary vision chart, such as ETDRS or HOTV, is designed to assess distance vision - for example at a distance of 3 or 6 meters. It measures how well you can see objects at a distance. In contrast, a near vision chart is used to assess vision at close range, typically for tasks such as reading or using a computer – typically at a distance of around 30-40 cm, which is the typical reading distance.

although a distance chart can indicate the presence of myopia by showing reduced distance visual acuity, it is not the optimal tool to accurately diagnose or quantify the degree of myopia. One should use a combination of tests, including those specifically designed for near vision, to provide a comprehensive evaluation.

Construction of a vision chart for nearsighted people (myopia):

Symbols, font size and line spacing:
There should be no difference from the regular vision charts, but values ​​must also be calculated here based on the vision test distance. Tables such as Jaeger et al. have contributed to complicating the process of performing a correct myopia screening.

Optical correction:
If the purpose of the chart is to determine a person's need for reading glasses or other nearsightedness correction, the eye chart can be used with and without reading glasses to assess the difference in clarity.

In short:
– is a near vision sight chart designed to assess nearsightedness and is designed with less text or symbols and closer viewing distances compared to a standard vision chart used for testing distance vision. But they should be constructed to exactly the same standards as the distance vision charts!

So here too it is important to choose charts that comply with ISO 8596.

This double-sided backlit vision chart from ISOeyes is ideal for testing children and other age groups for myopia. With a height of 210 mm, width of 122 mm, depth of 15 mm and weight of 110 grams, it is easy to use. A charger is included so it can be used with the included battery.

There is space on the chart for 3 different Optotypes, so the chart must not have changed the front of the chart when used with different age groups or with test subjects with special challenges such as illiteracy.

ISOeyes presents a near vision test system (myopia) which is a natural and correct extension of the "distance" vision charts.

This handy backlit myopia tester from Danish ISOeyes is designed to comply with the revised guidelines from the health authorities and operates logarithmically with CE-approved Optotypes in accordance with ISO 8596.

The charts have two sides and support both letters and shapes, including Thumbling E, Wekey, OpticianA and Similar.

Regardless of age group, everyone is covered with the four options on the same handheld vision chart. These charts are calibrated in relation to the distance vision charts and are configured for a viewing distance of 30 cm.

When do you say that a person is myopic?

A person is usually said to be nearsighted when they have a condition known as myopia. Myopia occurs when the eye cannot focus clearly on objects located at a distance and instead can focus clearly on objects that are closer. This typically occurs when the eye either has an eyeball that is too long (axial myopia) or a cornea that is too curved (corneal myopia).

The symptoms of myopia include:

  1. Difficulty seeing objects that are far away clearly.
  2. Often squinting or straining to see distant objects clearly.
  3. Better vision at close range, such as reading or screen work.

When you are nearsighted, the light rays are refracted slightly in front of the retina, which means that the focal point ends up a bit next to the visual cells on the retina. This results in a blurred image of what we are looking at.

When do you say that a person is long-sighted?

A person is usually said to be farsighted when they have a condition known as hyperopia. Farsightedness occurs when the eye has difficulty focusing clearly on objects that are close, and instead is better at focusing on objects that are further away. This typically occurs when the eyeball is too short in relation to its optical refractive power, or when the cornea has less curvature.

The symptoms of farsightedness include:

  1. Difficulty seeing close objects clearly, especially when reading or nearsighted tasks.
  2. May have trouble focusing on text or objects at close range without stretching the arms.
  3. Better vision at longer distances.

Farsightedness can also be corrected with glasses or contact lenses that have a positive lens power (plus power), which helps move the image back onto the retina so it becomes clear. The eye doctor can determine the exact strength needed and recommend the appropriate correction. It is important to consult an ophthalmologist if you experience symptoms of farsightedness, as untreated hyperopia can cause discomfort and reduced vision at close range.

When you are farsighted, the light rays are focused behind the retina. This is because the light-refracting ability of the cornea and lens is too weak in relation to the length of the eye. Often it is because the eye is too short, but it can also be because the cornea does not have the right curvature or the lens is too weak.

Do not use a standard wall-mounted vision chart for near vision testing!

Performing a myopia test using a standard wall-mounted vision chart presents several challenges and potential problems:

  • Inappropriate distance:
    • Myopia is characterized by difficulty seeing distant objects clearly. A standard vision chart on the wall is typically placed at a distance of 3 or 6 meters for a normal vision test. This setup does not effectively test for myopia, which requires evaluation of vision at shorter distances.
  • Lack of myopia testing:
    • Standard eye charts are designed to assess distance vision, not near vision. For myopia testing, use materials and charts specifically designed to be read at a shorter distance.
  • Lighting:
    • The lighting conditions in a room and potential glare on the chart can affect the accuracy of the test. Myopia testing often requires consistent, controlled lighting conditions, which is not guaranteed with a standard vision chart setup.
  • Accuracy of results:
    • Using a standard myopia vision chart can lead to inaccurate results. Myopitests should measure how well the patient can see at a short distance (eg reading a book, using a computer), which a 3 or 6 meter wall scheme cannot provide.
  • Failure to measure accommodation:
    • Nearsightedness tests often involve assessing the eye's ability to accommodate or focus on near objects. A distant vision chart does not test this ability and is thus missing a critical part of the near vision assessment.
  • Overlooks nearsightedness:
    • Myopia tests on regular vision charts may not detect other nearsightedness problems such as presbyopia (age-related difficulty seeing close objects) or astigmatism, which affect nearsightedness differently.

To effectively test for nearsightedness, a doctor, health care provider, optometrist or ophthalmologist should use specific nearsightedness charts and tools designed for reading distances, typically between 35 and 40cm from the eyes.

MANUALS & GUIDELINES

Logmar and guidelines

Here you will find useful information about the Danish Health Authority's new guidelines and what yours mean for your vision tests.

Innovative thinking and unprecedented possibilities to get exactly the vision chart that suits your wishes and needs!

Explore your many new options to get exactly the eye chart you need!