Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Certain illusions could even test your eyesight and help you identify your IQ score, although a proper test is advised.
Source: https://www.dailystar.co.uk/real-life/only-people-2020-vision-can-31425804