And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Wednesday, April 8, 2020
So, if you have one of the rarer versions, how would you know?
While most people that have vision defects are born that way, you should be periodically checked. some medications like plaquenil can cause vision changes including color blindness.
What are the colors to the right of violet? Does the top chart wrap around to red again? Back in the pre-historic times, when I was in school, the color chart memory aid to the visible light was ' ROYGBIV '. Has that changed when I wasn't looking or what?
I have protanomaly. It has been a problem at times, especially when choosing a pair of socks out of the dryer. It seems to be helpful, however, when looking for a certain shade of green when detecting diseases in plant foliage such as potatoes. The different shades stand out in stark contrast to the whole. The downside is that it is difficult to see the green on a tuber that has been exposed to light that causes "sunburn" in spuds.
How would you know? Ask Alexia maybe?
ReplyDeleteNope, ask "Ishihara".
Deleteyou look at the chart
ReplyDeleteand if any of the bars looks like Normal Vision
that's what you got.
This comment has been removed by the author.
Delete+1. Certain variants would have multiple bars the same. If you have the bottom then all are the same.
DeleteIf you went to a US public school or visited the eye doctor regularly as a child you would have been screened for color blindness fairly young.
While most people that have vision defects are born that way, you should be periodically checked. some medications like plaquenil can cause vision changes including color blindness.
ReplyDeleteWhat are the colors to the right of violet? Does the top chart wrap around to red again? Back in the pre-historic times, when I was in school, the color chart memory aid to the visible light was ' ROYGBIV '. Has that changed when I wasn't looking or what?
ReplyDeletePaul L. Quandt
P.S.: c w, thanks for the post.
Paul
I have protanomaly.
ReplyDeleteIt has been a problem at times, especially when choosing a pair of socks out of the dryer.
It seems to be helpful, however, when looking for a certain shade of green when detecting diseases in plant foliage such as potatoes.
The different shades stand out in stark contrast to the whole.
The downside is that it is difficult to see the green on a tuber that has been exposed to light that causes "sunburn" in spuds.