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Optometrist issues eye health warning over social media trend


An eye health specialist has issued a warning over popular tests that are doing the rounds on social media. Special media videos claiming to test your eyesight for colour blindness by showing different numbers have been circulating, and if you are colour blind, you will see a different number to those with normal colour vision.

With hundreds of people self-diagnosing colour blindness, Malcolm Maciver, optometrist at Leightons Opticians, said: “This type of TikTok video shows the Ishihara test, which is the most commonly used test for colour vision in practice, consisting of a series of coloured plated dots forming numbers or patterns that people with normal colour vision can see differently from those with red-green colour deficiencies.

“While it’s possible that the TikTok Ishihara test can provide insights on the matter, it should be used as a preliminary indication and people should seek professional evaluation for a definitive diagnosis.”

There are limitations to taking the Ishihara test via a screen rather than the physical test in natural lighting, Malcolm warns: “Subtle changes in colour perception can occur due to the luminance of the plates on a screen, as screens have more blue light projection than natural light, making them less sensitive to subtle cases. The accuracy of an Ishihara test depends heavily on the colour accuracy of the screen display. Monitors, smartphones and tablets can display colours very differently. If the colours are not displayed correctly, the results may be inaccurate.

“Ambient lighting can also affect how colours appear on a screen. It’s best to take the test in consistent, well-lit conditions to avoid discrepancies. Additionally, the resolution and quality of the Ishihara plates must be high. Compression and resizing of images, common on social media platforms such as TikTok, can distort colours and patterns, leading to inaccurate results.”

To indicate colour blindness, Malcolm recommends the following tips:

  • Use a reliable source if you see the signs in the TikTok video: Choose a reputable website or app known for providing accurate Ishihara tests. Avoid relying solely on social media platforms unless the test is from a verified source.
  • Check display settings: Make sure your device’s display is properly calibrated for colour accuracy by ensuring your screen brightness is set to a comfortable level for accurate colour perception.
  • Maintain proper testing conditions: The Ishihara test should be done at 1 metre distance, with the appropriate eyewear, in good natural lighting for the most accurate results.
  • Interpret results with caution: Use the results as a preliminary indication and seek professional evaluation for a definitive diagnosis. While it’s possible to find Ishihara tests on TikTok, it’s best to use it for informational rather than diagnostic purposes. If you have serious concerns about your colour vision, it is still best to seek professional advice. While online tests can give a general idea, they are not a substitute for professional diagnosis. Consultation with an optician is essential for an accurate assessment of colour vision deficiency.

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