Pitfalls in eye testing of children Inadequate testing environment: Testing in a room with poor lighting or distractions can lead to inaccurate results. Incorrect testing distance: Failing to maintain the appropriate testing distance can distort results and lead to false positives or negatives. Incorrect choice of eye chart: Using a chart that is not age-appropriate…
CE marking is no guarantee that your eye chart is correctly manufactured! Eye charts fall under medical devices class 1, and for class 1 equipment, it is solely up to the manufacturer to indicate whether the product meets quality requirements and guidelines for the correct execution of the eye chart. CE marking is therefore not…
What Are the Advantages of Switching to Using the Logarithmic Scale as a Measurement Unit in Vision Tests? A LogMAR Eye Chart (Logarithmic Minimum Angle of Resolution) is designed to enable a more accurate measurement of visual acuity than other methods. If vision test results are to be consistent and comparable, health authorities recommend the…
Screening of Children – the New Thresholds for Referral (LogMAR). Normal vision in children and adults is defined as 6/6 vision or decimal 1.00. The Danish Health Authority’s current guideline on “Preventive Health Services for Children and Adolescents” states that children should be referred to an ophthalmologist if the vision test result is worse than…
Here you can view, download, and print practice charts for children, and we recommend showing them to the child/test subject before the actual test on the vision chart. We have created 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…
1 ON TURN ON THE VISION CHART 2 OFF TURN OFF THE VISION CHART 3 INCREASE BRIGHTNESS PRESS TO INCREASE BRIGHTNESS STEPWISE 4 DECREASE BRIGHTNESS PRESS TO DECREASE BRIGHTNESS STEPWISE 5 WARMER LIGHT PRESS AND HOLD TO SWITCH TO WARMER LIGHT 6 COOLER LIGHT PRESS AND HOLD TO SWITCH TO COOLER LIGHT 7 NIGHT MODE…
Place the Eye Chart Correctly to Get Accurate Vision Test Results If all eye charts were calibrated the same and had the same dimensions, 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, whether a child or an adult,…
“Now we need to clear out the old unreliable vision charts that are still hanging in many Danish medical clinics. If for no other reason, then because the Danish Health Authority has issued new guidelines dictating the use of the Logarithmic scale.” This is the sentiment expressed by a large number of doctors and health…
Make Your Eye Chart Stand Out For a modest additional cost, you can get a chart that fits the style and image of your clinic. Why should everything be white or gray? ISOeyes produces a chart according to your taste, without compromising on quality and standards. For all 4 sizes of LED panels, we can…
It is not only the English figure chart from Kay Pictures that, according to recognized research, produces overly favorable vision test results compared to the reference chart from Landolt C (according to ISO 8596). The same is true for the Østerberg chart, which has been widely used in Denmark for decades. “Two out of three…
What’s wrong with our current eye charts? – 10 reasons why it is time to replace – now! STANDARDS ARE NOT FOLLOWED Unfortunately, many existing eye charts on the market do not comply with international standards such as ISO 8596. This results in frequent instances of misleading vision test results and makes it difficult…
Optotypes for Children – A Science of Its Own Eye Charts for Children Often Have Serious Flaws An Unregulated Market The market for children’s eye charts is largely unregulated, leading to inaccurate and overly favorable vision test results for children, which can result in missed referrals and lack of treatment. Unfortunately, it is entirely up…
Individualized Testing Distance? – We’ve Got You Covered! If the best placement of the patient in the clinic room is 3.5 meters from the eye chart, why not have an eye chart solution calibrated for testing at that exact distance? This way, no post-test calculations are needed. The measurement results will be accurate! At…
It’s That Simple with Eye Charts from Danish ISOeyes: With farsightedness and nearsightedness charts from ISOeyes, you can easily screen for both conditions using the two types of charts: the Distance Chart and the Near Vision Tester in combination. The two charts are precisely calibrated relative to each other, so the only difference in the…
Engelsk versionTysk versionDansk versionNorsk versionEngelsk version 10 reasons to why You should replace Your vision charts! Tysk version Dansk version 10 reasons why we must look at eye charts with fresh eyes Norsk version [ STANDARDS ARE NOT FOLLOWED Unfortunately, many existing eye charts on the market do not comply with international standards such as…
Visual Function Scales Related to Visual Acuity The measurement of visual acuity starts with defining the stimulus parameters: symbol size and viewing distance. The reference standard for size was defined by Snellen; the term “M-unit” was coined by Sloan. The reference standard for distance is the meter and its inverse, the diopter. Based on these…
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 the number 12. Plate 2 Normal vision: 8 Red-green deficiency: 3 Plate 3 Normal vision: 6 Red-green deficiency: 5 Plate 4 Normal vision: 29 Red-green deficiency:…
Lack of Standards for the Size of Figures Compared to Letters – leads to inconsistency across different vision tests and manufacturers. It is an obvious task for ophthalmological organizations and research institutions to examine widespread symbol optotypes and measure credible compensation factors. By following a more calibrated and standardized approach, it can be ensured that…
Manglende standarder for størrelsen af figurer i forhold til bogstaver – fører til inkonsistens på tværs af forskellige synsprøver og producenter. Det er en oplagt opgave for oftalmologiske organisationer og forskningsinstitutioner at undersøge udbredte symboloptotyper og udmåle troværdige kompensationsfaktorer. Ved at følge en mere kalibreret og standardiseret tilgang kan man sikre, at synsprøver med symboler…
Farvesynstest med ISHIHARA systemet De 38 ISHIHARA plader Download oversigten: Dansk version PDF International version PDF Plade 1 Alle bør kunne se nummer 12. Plade 2 Normal visning: 8 Rød-grøn problem: 3 Plade 3 Normal visning: 6 Rød-grøn problem: 5 Plade 4 Normal visning: 29 Rød- grøn problem: 70 Plade…
Dansk versionNorsk versionTysk versionEngelsk versionDansk version 10 grunde til at vi må se på synstavler med nye øjne: Norsk version [ Tysk version Engelsk version 10 reasons to why You should replace Your vision charts! STANDARDER FØLGES IKKE Desværre lever mange eksisterende synstavler på markedet ikke op til internationale standarder som ISO 8596. Dette resulterer…
Hvad er der galt med “den gode gamle synstavle”? “Hvorfor alt det postyr? Det er jo bare en screening!” “Ja, og netop den screening afgør om mulige synsproblemer afdækkes og visiteres til behandling i tide.” 10 grunde til at vi må se på synstavler med nye øjne: STANDARDER FØLGES IKKE – Desværre lever mange eksisterende…
Historien om udviklingen af den moderne synstavle Synsskarphedsrelaterede skalaer for visuel funktion Måling af synsstyrke starter med at definere stimulusparametrene: symbolstørrelse og synsafstand. Referencestandarden for størrelse blev defineret af Snellen; navnet »M-enhed« blev opfundet af Sloan. Referencestandarden for afstand er meteren og dens omvendte, dioptrien. På baggrund af disse parametre kan vi beskrive, hvordan øjet…
Faldgruber i synstest af børn Utilstrækkelig testmiljø: Testning i et rum med dårlig belysning eller forstyrrelser kan føre til unøjagtige resultater. Forkert testafstand: Manglende vedligeholdelse af den passende testafstand kan forvrænge resultaterne og føre til falske positive eller negative resultater. Forket valg af synstavle: der ikke er alderspassende, eller brug af diagrammer med ukendte symboler…
“Nu skal vi have ryddet ud i de gamle utroværdige synstavler, som fortsat hænger på mange danske lægeklinikker. Om ikke andet så fordi at sundhedsstyrelsen er kommet med nye retningslinjer som dikterer brug af Logaritmisk skala.” Sådan lyder det fra et stort antal læger og sundhedsplejere landet over. Det luner gevaldigt når hele missionen tog…
Måleenheder Synsskarphed øges ikke lineært! – men derimod logaritmisk – i forhold til størrelsen af de visuelle elementer. Når synsskarphed testes, bruges logaritmisk skala til at graduere størrelsen af bogstaverne eller symbolerne på tavlen, så de bliver mindre og mindre i en logaritmisk progression. Den logaritmiske skala gør det muligt at evaluere synsskarpheden på en…
Crowding Verden er kompleks og vores syn skal skelne mange ting fra hnianden, også når de er mange og står tæt. Synstavler udformes med crowding-effekten i tankerne af flere grunde, der alle sigter mod at sikre nøjagtige og pålidelige synsskarphedsmålinger samt at forbedre den diagnostiske proces: Repræsentativt for virkelige situationer: I virkeligheden oplever folk ofte…
Placer synstavlen korrekt for at få nøjagtige synstestresultater Hvis alle synstavler var kalibreret ens og havde samme mål, og vi mennesker alle var lige høje, kunne en synstavle altid placeres i samme højde og afstand fra testpersonen, barn eller voksen, og vi kunne være sikre på altid at få et sandt synstestresultat. Da ingen af…
