If you've ever been tested for colorblindness, the eye doctor probably had you look at a series of circles, crowded with multiple random-sized colored dots. For most people, the dots within the circle reveal a symbol, such as a number or letter. This group finds the test to be relatively simple; they can easily see the figure within because the dots appear to be two different colors.
However, for the colorblind, this type of test, known as an “Ishihara Test”, may prove to be literally impossible. While there are many types of colorblindness, the most common type makes it challenging, at best, to differentiate red from green. An estimated 1 in 12 men and 1 in 200 women are affected by the condition.
The color-perception test was named after its designer, Shinobu Ishihara
a professor at the University of Tokyo, who first published his tests in 1917. The full Ishihara test consists of 38 circles (known as “plates”), but the presence of a severe red-green deficiency is usually apparent after an individual views only a few. Since its introduction, the Ishihara Color Blindness Test has become commonly used worldwide because of its easy use and high accuracy.At present, there is no cure for inherited color blindness, but most people find ways to cope with it, having never known anything else. Children with color blindness may need help with some classroom activities, and adults with the condition may be restricted from holding job positions which require seeing true colors.
1925 – Johnny Carson, American television host (d. 2005)
1956 – Dwight Yoakam, American singer
1959 – Nancy Grace, American former prosecutor
1962 – Doug Flutie, American football player
1976 – Ryan Reynolds, Canadian actor
On October 23rd, the Swallows Depart from San Juan Capistrano Day marks the migration of thousands of swallows.
The famous cliff swallows of San Juan Capistrano leave town every year in a swirling mass near the Day of San Juan (October 23). They head for their winter vacation spot 6,000 miles south in Goya, Corrientes, Argentina. Each year, they return on or about March 19th – St. Joseph Day. Their migration has been marked for generations.
Cliff swallows are cousins of barn swallows and purple martins.
Swallows have long, narrow wings, forked tails, and weak, tiny feet. Incredibly graceful in flight, they feed on the wing, catching insects in their wide mouths; they can effortlessly make abrupt changes in direction or speed as they feed.
They come back on March 19th... read more about them here:
https://sanjuancapistrano.com/san-juan-capistrano-swallows/
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