Useful instructions

Lack of standards for weighting children's charts

Lack of standards for the size of figures in relation to letters – leading to inconsistency across different sight tests and manufacturers. It is an obvious task for ophthalmological organizations and research institutions to investigate widespread symbol optotypes and measure reliable compensation factors. By following a more calibrated and standardized approach, one can ensure that vision tests with symbols…

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ISHIHARA color vision test

Color vision test with the ISHIHARA system The 38 ISHIHARA plates Download the overview: Danish version PDF International version PDF Plate 1 Everyone should be able to see number 12. Plate 2 Normal view: 8 Red-green problem: 3 Plate 3 Normal view: 6 Red-green problem: 5 Plate 4 Normal display: 29 Red-green problem: 70 Plate…

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10 good reasons to replace your old vision chart - watch video

Danish versionNorwegian versionGerman versionEnglish versionDanish version 10 reasons to why we must look at eye charts with new eyes: Norwegian version [ German version English version 10 reasons to why You should replace Your eye charts! STANDARDS ARE NOT FOLLOWED Unfortunately, many existing sight charts on the market do not meet international standards such as ISO 8596. This results…

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What's wrong with the old light box?

What's wrong with "the good old vision chart"? “Why all the fuss? It's just a screening!” "Yes, and precisely that screening determines whether possible vision problems are uncovered and examined for treatment in time." 10 reasons why we must look at vision charts with new eyes: STANDARDS ARE NOT FOLLOWED – Unfortunately, many existing…

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Pitfalls in vision testing of children

Pitfalls in Children's Vision Testing Inadequate Testing Environment: Testing in a room with poor lighting or distractions can lead to inaccurate results. Improper Test Distance: Failure to maintain the appropriate test distance can distort results and lead to false positive or negative results. Wrong choice of vision chart: not age appropriate, or use of diagrams with unfamiliar symbols...

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Units of measurement

Units of measurement Visual acuity does not increase linearly! – but rather logarithmically – in relation to the size of the visual elements. When visual acuity is tested, a logarithmic scale is used to graduate the size of the letters or symbols on the chart so that they become smaller and smaller in a logarithmic progression. The logarithmic scale makes it possible to evaluate visual acuity on a…

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Location of the vision chart

Place the vision chart correctly to get accurate vision test results If all vision charts were calibrated the same and had the same measurements, and we humans were all the same height, a vision chart could always be placed at the same height and distance from the test subject, child or adult, and we could be sure always getting a true vision test result. Since none of the…

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ISOeye's vision charts are calibrated to the dimensions of the clinic room

Individual vision test distance? - We deliver! If the best position of the patient in the clinic room is 3.5 meters from the vision chart, then why not get a vision chart solution that is calibrated for vision testing at that distance? Then there is no need to convert afterwards. The measurement result fits! At ISOeyes, the standard distance is 3 or 6 m and we stock in…

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The Danish Health Authority's guidelines for vision tests

The new guidelines: (Decided, but not yet published) Measurement units and registration are called LogMAR in future: Vision tests on vision charts charts must in future be read and registered with logarithmic values ​​(LogMAR) and not 6/6 or decimal values. Requirements for the visual charts' physical design: 3-6 year olds: The chart must be calibrated for a vision test at a distance of 3 metres. The chart is equipped with…

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How to measure your child's vision with the LogMAR scale

Screening of children – the new limit values ​​for visitation (LogMAR). Normal vision in children and adults is defined as a 6/6 vision or decimal 1.00. The Danish Health Authority's current guidance on "Preventive health services for children and young people" states that children must be referred to an ophthalmologist if the vision test result is worse than 6/9 (or decimal 0.66) in just one of the eyes (monocular). (On a chart designed for…

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Optotypes for children – a science in itself!

Optotypes for children – a science in itself! Vision charts for children in many cases have serious faults. An unregulated market Charts for children are an unregulated market that leads to incorrect, overly favorable vision test results for children, resulting in a lack of visitation and treatment. Unfortunately, it is entirely up to the manufacturer to set the compensation as figure-based…

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How to test for both farsightedness and nearsightedness!

It's that simple with vision charts from Danish ISOeyes: With long vision and near vision charts from ISOeyes, you can easily screen for both long vision and near vision by using the two types of charts, the Distance chart and the near vision tester in combination. The two charts are precisely calibrated in relation to each other, so the test only differs in terms of viewing distance. That…

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Especially vision charts for children can still be misleading

It is not only the English figure chart from Kay Pictures which, according to recognized research, gives over-favorable vision test results compared to the reference chart from LandoltC (cf. ISO 8596). This is also the case with the Østerberg chart, which has been widespread in Denmark for decades. "Two out of three children in need of glasses are not discovered during routine checks" - it says...

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CE marking is no guarantee that your eye chart is correctly produced!

CE marking is no guarantee that your vision chart is correctly produced! Vision charts belong to class 1 medical equipment, and for class 1 equipment it is solely up to the manufacturer to indicate whether the product complies with quality requirements and guidelines for correct execution of the vision chart. CE marking is therefore not a guarantee of quality and compliance with…

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Logmar explained

What are the benefits of the switch to using a logarithmic scale as the unit of measurement for vision tests? A logMAR Vision Chart (Logarithmic Minimum angle of resolution) is designed to enable a more accurate measurement of visual acuity than using other methods. If vision test results are to be consistent and comparable, health authorities recommend the use of Logarithmic construction of vision charts and reading of…

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Practice charts

Here you can see – download and print practice charts for children and we recommend that you show it to the child/test person before the actual test on the vision chart. We have prepared practice charts for the 3 types of Optotypes: Eyekey, Similar and Wekey. Eyekey Eyekey Download PDF – versions Eyekey-swedish Eyekey-spanish Eyekey-norwegian Eyekey-italian Eyekey-german Eyekey-french Eyekey-English Eyekey-dutch Eyekey-danish…

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Douchrome red/green color sys screening

The figure is used as a first screening for the most common color vision anomalies such as color blindness, where you cannot distinguish between red and green (deuteranopia). The person tested must be able to name the colors. The duochrome red-green test is also a standard tool for determining the eye's refraction point (refraction). Looking at the red/green chart, the…

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The remote control

1 TURN ON TURN ON THE VISION BOARD 2 CUT OFF CUT OFF THE VISION BOARD 3 INCREASE BRIGHTNESS PRESS TO INCREASE THE BRIGHTNESS INCREASE 4 DECREASE THE BRIGHTNESS PRESS TO DECREASE THE BRIGHTNESS GRADUALLY 5 WARMER LIGHT PRESS AND HOLD TO CHANGE TO WARMER LIGHT 6 COOLER LIGHT PRESS AND HOLD TO CHANGE TO COLDER LIGHT 7 NIGHT MODE…

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