The following are common tests used to detect color blindness.
Can you read the numbers hidden in each square? 作者: fighterplane 時間: 2008-10-2 22:35
You should see 58 (upper left), 18 (upper right), E (lower left) and 17 (lower right).
If you cannot see any of the above numbers/letters, you may suffer from color blindness. 作者: beautiful 時間: 2008-10-2 23:16